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Plywood is an engineered, layered wood sheet that comes in various thicknesses. The veneers are glued together adjacently, with its grain rotated at 90º on each layer.

It’s manufactured using a cross-graining technique that helps to reduce splitting and creates a strong, consistent panel.

While plywood has been widely adopted for various construction uses, one major flaw is its low resistance to excess moisture exposure.

We've put together this useful guide to help you successfully waterproof your plywood so that it lasts much longer, even in moist environments.

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Table of Contents

1. Is Standard Plywood Waterproof?
2. Can You Make Plywood Waterproof?
3. Can You Buy Waterproof Plywood?
• Class I
• Class II
• Class III
4. Benefits of Waterproofing Plywood
• Prolonged Life
• Prevents Dry Rot
• Prevents Wet Rot
• Prevents Warping
• Prevents Splitting
5. How to Waterproof Plywood
• Surface Preparation
• Epoxy Sealer
• Woodcon
• Hardwax Oil
• Liquid Latex
• Marine Sealer
• Polyurethane Varnish
• Water-Based Stain
• PVA
• Sealing the Edges
6. Conclusion

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Is Standard Plywood Waterproof?

Standard birch plywood sheets are not waterproof!

It’s a great wood for home construction as its laminated structure offers more stability than other sheet timbers.

However, prolonged exposure to moisture will cause the plywood to delaminate, soak up moisture and swell - eventually destroying the wood’s structural integrity.

In fact, the type of adhesive used to bond plywood is the cause of its low moisture resistance.

Most plywood manufacturers use urea-formaldehyde because of its low cost, its availability and resistance to microorganisms that may destroy the wood.

But its high water solubility is the plywood's major disadvantage.

Over time, exposure to water will cause the individual layers of the plywood to split and the glue to disintegrate.

Can You Make Plywood Waterproof?

You can waterproof standard plywood by following the simple steps outlined in this article.

The plywood cross-grain finish and urea-formaldehyde make it very receptive to waterproofing materials like paint or sealant.

Urea-formaldehyde glue has high water solubility, absorbing liquid-like paint applied to the surface.

Also, its cross-grain finish creates a rough surface that prevents paint or sealant from slipping away when applied.

While waterproofing plywood means applying a waterproof substance to its surface and around its edges, many techniques and substances may be employed depending on your available resources.

Can You Buy Waterproof Plywood?

There are many brands of waterproof plywood available in the market.

One thing to note is that these waterproof plywoods are not all of the same quality.

Plywood is available in three types:

1. Commercial Plywood.
2. Boil Water Resistant (BWR) Plywood.
3. Marine Plywood (also called Boil Waterproof).

For waterproof plywood, we recommend purchasing marine plywood for general use.

But the quality of the plywood will depend on the grade you get. There are three grades in the United Kingdom:

Class I

These are plywoods designed for interior use and less humid environments. (Examples are commercial plywood.)

Class II

This plywood is designed for interior use but has a level of moisture resistance and resistance to humid environments like the kitchen and bathroom. (Examples are the BWR plywood.)

Class III

These plywoods are designed for highly humid environments and perform well if exposed to water. It’s great for outdoor use.

Benefits of Waterproofing Plywood

If you've read thus far, you've probably gotten a sense of the advantages of utilising waterproof plywood.

Here are some ways that waterproofing your plywood may benefit you:

Prolonged Life

Exposing plywood to excessive moisture will destroy the wood very quickly.

Applying a waterproofing substance to your plywood can prevent the wood from warping, splitting or deteriorating.

Waterproofing substances add an extra layer of protection to your plywood, which prevents the wood from absorbing moisture, instead causing water to run off its surface.

In addition, this waterproofing material, like sealant or paint, will make the wood stronger than standard plywood.

Fully waterproofed plywood has an expected lifespan of around 10 to 50 years.

Prevents Dry Rot

Despite the name dry rot, it is caused by fungal growth from damp and high-humidity situations.

This virulent fungal infection in the wood can easily spread throughout the plywood and cause major damage.

Also, it is important to note that dry rot will affect plywood with a 20% moisture content.

Waterproofing strategies that help reduce moisture content in the wood or eliminate it must be employed to prevent dry rot.

The fungus will struggle to survive outside damp areas or surfaces.

Prevents Wet Rot

One of the most common causes of plywood deterioration is wet rot, which is caused by exposure to water.

Wet rot may not always cause the wood to crack, but it can cause the plywood to swell and lose its structural integrity.

Plywood rot not only looks ugly, but it also smells horrible, and when this happens, the plywood must be removed since it no longer serves its purpose.

Wet rot may be disastrous for your property's interior or exterior.

Waterproofing your plywood might spare you the trouble of dealing with a slowly deteriorating plywood panel caused by wet rot!

Prevents Warping

Warping destroys plywood!

When plywood warps, it simply means that the moisture content of the different layers of the wood is uneven, causing major bending, deformity and structural disintegration.

For instance, when one part of the plywood dries faster than the other, the dried section shrinks and causes the wood to warp.

Using waterproofing materials such as polyurethane provides a nonporous seal for your plywood.

It’s an excellent technique to prevent warping, as it reduces the amount of moisture the wood absorbs.

Prevents Splitting

Moisture and humidity will cause the plywood to expand, leading to splitting.

The most effective wood splitting solution is to eliminate the moisture that the wood can absorb.

Most waterproofing materials provide an excellent layer of protection and a nonporous seal to the plywood, preventing it from absorbing moisture.

Furthermore, a thoroughly sealed plywood surface keeps the wood compact and stable, preventing fungus from developing or wood expansion.

Waterproofing your plywood before use is the perfect technique for staying one step ahead of this situation.

How to Waterproof Plywood

There are various ways to waterproof plywood.

However, it’s important to consider available resources, the cost, the size of the wood and other factors before you choose a suitable application.

Before treating your plywood, it’s best to wear safety clothing such as glasses and gloves.

In addition, you should work in a well-ventilated area to prevent breathing excessive fumes and follow the manufacturer's directions exactly.

Surface Preparation

Materials

• Sandpaper
• Rag or cloth
• Mineral Spirit
• Primer

Step 1

Prepare the plywood by wiping it clean with a cloth. You want to ensure there are no particles or stones on the surface of the wood.

Step 2

Depending on the grade of plywood you have, gently sand the surface until reasonably smooth.

Grade A plywood does not need sanding, but grade B or other lower grades will need their surfaces sanded.

Step 3

Wipe the surface of the plywood with a rag soaked in mineral spirit. Ensure there is no saw dust left on the surface.

Lastly, apply a primer on the surface using a brush or roller and leave it to dry.

Here's some of the best techniques to waterproof your plywood:

Epoxy Sealer

Epoxy sealer is a glossy protective film or coating applied to the surface of the plywood.

It forms a hard, abrasion resistant coating, and produces a longer-lasting surface than most waterproofing methods.

In addition, its nonporous coat means that the plywood doesn’t trap moisture, instead allowing for water to roll away from its surface.

Epoxy sealers are available in spray and paint versions and are known to make the plywood surface stronger.

Tools

• Roller
• Stock 3" inch foam brush
• Chip brush
• Pair of gloves

Step 1

Pour and measure resin and hardener into separate containers.

There are different resin-to-hardener ratios, depending on the type of Epoxy used.

Ensure you mix the right ratio.

Pour the hardener and resin into separate cups to get the right measurement.

You can get the correct ratio on the package label - for example: 2:1, 1:1 or 3:1.

While mixing the resin and hardener, ensure you’re wearing protective gloves.

Step 2

Mix and stir the resin and hardener in a single container.

After getting the right ratio in a separate cup, you can mix the components together by pouring the resin into the hardener or vice versa.

Use wood or plastic to stir the mixture for at least five minutes.

If you notice bubbles in the mixture, it can easily be removed by heating the surface of the plywood.

Step 3

Pour the mixture on the centre of the plywood and spread using the foam brush.

Pour the mixture carefully on the centre of the plywood, and spread it using a foam brush.

You don't need to worry too much about even spreading as it’s the first layer.

You will need to act quickly as the mixture will harden quickly.

Step 4

Get rid of the bubbles with heat.

After applying and spreading the Epoxy across the surface of the plywood, you may notice small bubbles on the surface.

You can eliminate these bubbles by applying heat from a hair dryer.

Ensure it’s at least 7 inches from the epoxy surface and move it over the wood until the bubbles disappear.

Step 5

Apply another layer of Epoxy.

Let the first layer of Epoxy dry for at least 5 hours before applying another layer.

Pour the mixture on the centre of the wood, and spread evenly using a spatula.

Continue to spread until you achieve the desired flatness and smoothness across the plywood surface.

Leave the plywood to dry for a minimum of 24 hours, although 36 hours is recommended.

Woodcon

The Woodcon technique forms a layer of transparent water repellent coating on the surface of the plywood.

In addition, Woodcon offers fire retardant benefits, which means it's less likely to burn.

It's easy availability makes it a popular choice of waterproofing across the United Kingdom.

Furthermore, it can be applied using a paint brush, roller or sprayed across the surface of the plywood.

Hardwax Oil

Hardwax oil is an excellent nonporous sealant that helps to waterproof plywood.

It’s made of a mix of vegetable oils and wax, with additional chemicals such as volatile organic compounds, colouring, and drying agents.

In addition, the substance provides additional aesthetic appeal when applied to the plywood, forming a plastic-like layer on the wood.

It also helps the wood last longer, making it resistant to wear and water-repellent while keeping the wood’s natural moisture inside.

Here's how it's done:

Step 1

Clean the plywood thoroughly to eliminate any dirt and dust.

If entrenched stains need to be removed, use a clean wipe with a small amount of dish soap or cleaning solution.

Step 2

After that, wipe away any remaining cleaning product.

If some stains are particularly difficult to remove, you can lightly sand the surface of the plywood.

Step 3

After thoroughly cleaning the plywood and removing any cleaning product traces and leftover sawdust, apply an even layer of the hardwax oil, following the product instructions carefully.

Step 4

Allow at least 4 - 6 hours, preferably overnight, to dry.

If you used hardwax oil for the floor, you must wait at least 16 hours before allowing people to walk over it.

Liquid Latex

Liquid latex, also known as liquid rubber, is another inexpensive but effective technique to waterproof plywood.

It comes in spray cans or paint solutions, and is available at local DIY stores.

When applied to the surface of your wood, it provides a layer of waterproof protection.

If you want to waterproof a small sheet of plywood and have a limited budget, then liquid latex technique is best.

Here's how it's done:

Step 1

Remove dust and debris from the plywood's surface using a clean cloth and some detergent.

If you prefer, you can use a 50/50 mixture of water and vinegar to achieve a streak-free finish.

Step 2

Once the plywood is clean and dry, with no traces of cleaning agent, you can apply the liquid latex with a clean paintbrush or roller.

Make sure to apply it in a smooth, even layer whether you spray, brush, or roll it on.

Step 3

After applying the liquid latex, allow the plywood to dry for an hour or so.

It should dry fairly quickly.

Marine Sealer

Marine sealers are excellent for plywood exposed to excessive moisture, like boats and sea vessels.

It produces an air-tight layer over the wood surface.

Step 1

All surfaces of the plywood should be cleaned before applying the sealant.

Step 2

Remove old coats, debris and other materials on the wood.

Step 3

Carry out an absorbency test by sprinkling water on the plywood surface.

If the water doesn’t get absorbed quickly, stripping the wood is necessary.

Avoid applying in hot temperatures of above 950F, or if rain is expected within 15 hours.

Thoroughly mix and stir the marine sealant.

Test on a small section before proceeding to apply over the wood surface.

Apply the first coat using a synthetic paintbrush or spray.

Apply the next coat at least an hour after the first coat.

Allow at least 12 to 24 hours to dry naturally, depending on the temperature.

Polyurethane Varnish

Polyurethane varnish is a tough coat that can be used to add a layer of protection to plywood.

It’s available in water, solvent and oil-based types, with its water production containing less volatile organic compounds (VOC).

Polyurethane varnishes protect materials like plywood from moisture and harsh weather conditions.

You will require the following:

• A small paintbrush
• Tape for masking

Also, don't forget to wear protective gear, as polyurethane contains incredibly harmful chemicals like carbon monoxide and hydrogen cyanide.

Make sure to apply the polyurethane varnishes around the edges of the plywood, as these are most susceptible to absorbing water.

Here's how it's done:

Step 1

Using a brush, apply a coat of varnish to the plywood's edges. Avoid getting varnish on the surface of the plywood.

If varnish gets on the surface of the plywood, it will prevent the wood from absorbing any future treatment/product.

Cover the plywood completely with masking tape, leaving only the edges, to prevent the varnish from getting onto the surface.

Step 2

After painting the varnish onto the edges and following the manufacturer's drying time guidelines, apply another 1 or 2 coats to the edges, allowing for drying time between coats.

Water-Based Stain

Water-based stains are a great way to waterproof plywood.

It offers deeper penetration into the wood than oil-based stains, resulting in a deeper and rich colour with the first coat.

Other fantastic advantages of using a water-based stain for waterproofing include the following:

• Low odour compared to other techniques
• Fast drying
• Less volatile organic compounds (VOC)
• Available in both spray and hand application
• Prevents UVA sun damage

You will need the following supplies:

• Water-based pigment stain
• Cotton rags
• A spray bottle with a pump

Step 1

Apply an even layer of staining product to the entire surface of the plywood using a spray bottle or a disperser provided by the manufacturer.

Step 2

After spraying the entire surface, use a clean rag to remove any excess stain.

Water-based stains only provide a light finish, so don't expect to see dramatic or noticeable colour changes.

Step 3

Allow the product to dry thoroughly according to the manufacturer's instructions on the stain packaging, and don't be tempted to shorten the drying time!

Wait 24 hours after spraying the treated plywood. For best results, allow it to dry completely. When you're sure it's completely dry, apply another coat or two to your liking.

PVA

This is a type of glue that has traditionally been used for bookbinding. PVA has every property that a waterproofing material should have.

It dries clear and thin, adheres nicely to plywood, and is entirely waterproof.

If you wish to seal plywood with PVA, dilute it with water, so it goes on smoother and soaks into the board a little before drying.

Sealing the Edges

To seal the edges of the plywood, do the following:

Apply several coats of varnish around the edges.

Ensure the varnish dries for at least 2 hours.

Since the edges absorb the varnish rapidly, you'll need to apply extra coats to ensure that it cures to produce that protective coating you want.

Conclusion

Waterproofing plywood will help you protect it against warping, rotting and other damage caused by excessive moisture, high humidity and environmental conditions.

The process of waterproofing can be done easily if the steps listed in this article are followed correctly.

Also, an added benefit to the plywood is that it makes it last much longer.

OSB, or Oriented Strand Board is a popular material used in hardwood flooring, underlayment, wall sheathing, sheds, and roofs.

It is an engineered wood product, which is generally more affordable than plywood, and it has no internal gaps.

Indeed, OSB is considered as a functional option for many building and remodelling projects as it is low cost, and yet considerably strong.

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Table of Contents

1. What is OSB Board?
2. Tools You’ll Need
3. Surface Preparation
4. Fill Gaps
5. Seal Edges
6. Priming the Surface
7. Using the Right Paint
8. Paint Roller vs Spray Painting
9. Conclusion

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What is OSB Board?

Image credit: Wickes

OSB board is composed of several layers of chipped wood.

These are referred to as strands.

Once they are arranged to be flat and oriented in a perpendicular form to each other, cross-hatched strands with resins are added to create a more stable and solid board.

Many prefer OSB to plywood and other types of wood because it is environmentally friendly, affordable and easy to purchase.

It is also easier to screw into.

While OSB board is mainly used for its functionality, in some cases it is also used as a finished surface.

As a result in such cases, one may wish to paint it to make it look more attractive.

Having said that, there are some things to bear in mind when painting OSB board.

We shall discuss these factors as well as the best way to go about painting such boards in more detail hereunder.

Tools You’ll Need

Image credit: DIY.com

You will need the following tools and materials to paint OSB:

• Paint
• Primer
• Polyester resin filler (optional)
• Wood floor wax stripper (optional)
• 80 grit sandpaper
• Roller tray and thick nap roller cover (19 inch)
• Bucket and screen or a paint tray
• Electric sander
• Dust mask
• Gloves
• Vacuum cleaner

Surface Preparation

Start off by lightly sanding the surface of the OSB using an 80 grit sandpaper on an electric sander.

Make sure not to sand the edges.

Once ready, clean the surface thoroughly.

To do this well, it’s best to use a vacuum cleaner with a brush attachment, since cotton rags or tack cloths will not do the job well enough due to the rough texture of OSB.

Proper surface preparation is of utmost importance.

This is especially due to the fact that OSB board has a thin layer of wax.

This coating is intended to protect it against moisture, but it also inhibits painting.

As a result, it’s best to remove this coating by applying a wood floor wax stripper, prior to painting the OSB.

The board’s texture can also be smoothed out somewhat if you add a polyester resin filler.

Alternate the filler coats with some sanding to smooth out the texture of the cross hatched wood chips of the board.

Fill Gaps

Any gaps in the OSB should be filled up by using a block-filler primer.

This will fill up the gaps in between the wood strands well.

It is also important to fill gaps in OSB as a smoother look can be achieved, and this will help in getting a better paint job.

Seal Edges

Image credit: Amazon

You should try to preserve the factory edges as much as possible.

These will be smoother than those which you need to cut.

And since OSB’s cut edges are prone to water penetration, it’s crucial to seal them.

While factory edges will have already been treated with a sealant, this is not intended to last for a long period of time.

So the edges should be sealed well.

To do this, first apply a resin filler, and then sand.

As a result, the edges will be far more moisture resistant.

Another noteworthy consideration is it’s crucial to avoid exposing the edges of OSB board to water or moisture as swelling and/or cracking could occur.

Despite the fact that OSB is manufactured to withstand moisture exposure to a certain extent, such as occasional rain, it’s highly recommended to avoid permanent exposure of such boards from the elements.

This is because if water is allowed to penetrate the material, swelling and disintegration will result.

Priming the Surface

Primer is crucial to eliminate the possibility of the OSB’s wood fibres to lift and separate due to moisture exposure.

It’s best to use an acrylic latex stain-blocking primer, as this will offer a good coverage and protection, as well as hide any stains on the OSB.

Priming also serves to seal the paint and reduces the possibility of any bleed-through.

Pour primer in a tray, dab the roller in it, and prime the boards making w-shaped sweeps.

After around two hours, apply a second coating of primer.

This process should be repeated until you can see that the OSB’s flaky patterns have been hidden.

Make sure to allow it to dry well before moving on to painting.

Using the Right Paint

It’s very important to use the right paint for OSB.

Ideally, avoid water-based paints since as mentioned earlier, OSB can swell.

Thus, an oil-based primer is recommended.

If you were to paint OSB as if it were plywood or a similar material, the painted surface will end up peeling after a period of time.

It will also look unattractive and regular maintenance will definitely be a must.

Thus it’s essential to opt for oil-based paint.

First, apply a top coat of the paint and allow it to dry well.

Then, repeat the process as it’s always best to apply two coats.

Paint Roller vs Spray Painting

Image credit: Pexels

You might be tempted to spray paint OSB instead of using a paint roller.

However this is not ideal.

Rolling paint will take longer than spraying, but you will achieve much better coverage.

Moreover, you should be aware that if certain paints are used, the OSB’s strands will still remain visible if merely one coat of paint is applied.

Besides, the open strands will absorb paint readily, and hence several coats would be necessary.

As a result, it’s recommended that a filler and heavy primer are applied in order to remove some of the wood’s texture from the board, prior to painting.

Conclusion

OSB is a great alternative to plywood and other materials.

Besides being affordable and environmentally friendly, it’s also readily available at most DIY stores and timber merchants.

However, if you’re going to paint it, it’s important to follow this guide to achieve good results.

OSB can be painted, but this needs to be done properly and carefully, so that in the end you can have a nicely painted OSB project that can last a long time.

OSB and plywood are engineered woods that can be used alternatively in building construction.

Both products are made from wood, glues and resin, sharing other similarities.

However, this does not mean they are the same nor that they will perform the same in similar applications.

Builders and homeowners should know the difference between these products and their suitable uses.

In this article, we take an in-depth look at OSB and plywood, identifying its differences and helping readers make well-informed decisions.

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Table of Contents

1. What is OSB (Oriented Strand Board)?
2. How Is OSB Made?
3. OSB Durability
4. OSB Water Resistance
5. Pros of OSB
6. Cons of OSB
7. What is Plywood?
8. How is Plywood Made?
9. Plywood Durability
10. Plywood Water Resistance
11. Pros of Plywood
12. Cons of Plywood
13. Conclusion

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What is OSB (Oriented Strand Board)?

Image credit: Wikipedia

Oriented strand board (OSB) is an engineered wood formed from layers of compressed wood strands adhering to a specific orientation.

The individual wood strands are about 2.5 cm x 15 cm and are laid uneven across each other.

It is a popular choice for sheathing, roof decking and flooring, and it is also great for furniture making.

OSB's combination of wood, wax and adhesive makes it durable for structural building work.

It is resistant to warping, delamination and raking.

How Is OSB Made?

Oriented strand board is made of wood that is shredded into strands.

OSB uses trees such as pines, aspen poplar, and other mixed hardwoods.

The process of manufacturing OSB is divided into 5 steps. These are:

1. Picking and debarking
2. Stranding and drying
3. Blending and forming
4. Pressing
5. Quality control

Picking and Debarking

Oriented strand boards are made from carefully selected trees like pines, aspen poplar, and other hardwoods.

These trees come from a sustainably managed forest.

They are grown and harvested every 10-15 years, making sourcing very sustainable.

After harvesting these trees, they are sent to the manufacturer for debarking.

Debarking means simply removing the bark from the trees.

The removed bark is used as a source of fuel for the drying process.

It is a great eco-friendly process.

Stranding and Drying

Next, the debarked trees are sent to the strander machine.

The strander machine is composed of precision blades moving at 2500 pm.

They are programmed to cut the trees into strands in predetermined dimensions, thicknesses, widths, and lengths.

Once the stranding process is completed, the strands are moved to a dryer.

The dryer is powered by fuel from the debarks of trees.

They are programmed at a certain temperature and help reduce the moisture in the strands.

Note that the dryer does not eliminate the moisture in the strands.

Blending and Forming

Wood strands are moved in for blending and forming.

It involves mixing the strands with adhesive resins (such as urea-formaldehyde; phenol formaldehyde resin on its surface; and poly-methylene diphenyl diisocyanate in the inner region).

Then the wood is bonded together and cut into rectangular mat sizes.

Pressing

Next, the mats are moved onto a presser that could weigh up to two million pounds.

The presser compresses the strands into a single board using up to 7500 psi and over 400 degrees Fahrenheit.

The finished product from here is recognisable as OSB, but the process doesn't end here.

Quality Control

All these processes are carried out in a highly controlled environment.

They ensure that the boards are of similar quality, and they reduce the number of defects.

Computerised processes are employed to reduce human errors.

In the United Kingdom, OSB manufacturing and use are governed by EU standards until January 2023.

OSB must comply with designated EU or UK standards for wood panels, including the (BS)En 13986: 20004+A12015.

OSB Durability

OSB and plywood are durable materials.

The level of durability will vary amongst them.

Regarding how they perform in a moist environment, OSB is slower in absorbing water.

Its resistance to moisture makes it a desirable choice in damp areas.

However, it has been known to swell, especially on the edges and it does not return to its original shape, even after drying.

In terms of strength, OSB is similar to plywood.

It can lift the same weight as plywood.

OSB is heavier than plywood and more consistent.

In summary, OSB is great for home construction and can last a long time if maintained well.

OSB Water Resistance

Quality OSB can resist water damage.

The strands that make up the board are coated with adhesive resin and wax.

These substances give strength, durability, and waterproofing to the OSB.

The OSB grade 1 will resist damage from rain during harsh weather.

But excessive exposure to rain over a long period of time will damage the board.

Signs of damage to the board can be noticed at the edge of the OSB.

As it absorbs water, the edges begin to swell and expand.

Soon the edges begin to delaminate and break.

The board is excellent as a waterproofing system and is used for walls, subfloors, and roofing.

In addition, there are different grades of OSB.

Some are designed to provide more resistance to water and moisture exposure than others.

The grade of OSB should always be factored in.

Overall, do not expose OSB to excessive moisture.

Pros of OSB

• OSB is built to be consistent from one side to another.
• OSB does not have the knots, holes, and defects that are common with plywood.
• Its consistency allows for easy use and structural integrity.
• OSB is sourced from an eco-friendly and sustainable process. The trees are planted and harvested every 15 years. And every aspect of the tree, including the bark, is used during manufacturing.
• OSB is denser and stronger than plywood. This is one major reason for its growing popularity amongst builders, especially when it is used in flooring.

Cons of OSB

• Although OSB is stronger than plywood, there is a concern that it is too flexible, especially when used for flooring. The flexibility may cause the floor to be squeaky.
• There is a false perception that OSB is of low value for money. On the contrary, OSB is one of the best-engineered woods available for construction.
• Some users of OSB have criticised the board for looking unfinished. However, there are several creative ways to design OSB board for it to look very appealing to the eye.

What is Plywood?

Image credit: Wikipedia

Plywood is a type of engineered wood manufactured from wood veneers (thin slices of wood).

It is glued to resin, with each adjacent layer of wood having its grain rotated 900.

The process of rotating the wood grain is referred to as cross-training.

Cross-training helps to reduce wood splits during nailing.

It also reduces the effect of expansion and contraction.

The grains are arranged oddly so that the board is balanced.

This odd arrangement helps to reduce warping.

How is Plywood Made?

Plywood is made using different procedures depending on the intended use.

For instance, plywood used in construction is cut into flat boards, while plywood for furniture or aircraft use is cut into curves.

Picking and Debarking

Plywood is made from woods like oak, poplar, Monterey pine, Okoume and many others.

The trees are cut into logs and prepared for debarking.

Next, carefully selected trees are sent in for debarking. It means removing the bark from the logs.

Debarking is done mechanically with a machine with teeth blades on its end.

Slashing and Clipping

The logs are moved on to the slashing process.

Each piece of wood is slashed into 8-foot logs and measured for quality control.

Next, they are moved onto a roller cutter and cut into long ribbons.

The ribbons are usually 1/8th of an inch thick.

The ribbon is moved onto the clipping table; clipped into 4 x 8 sheets and stacked together for drying.

The veneers are then thoroughly dried until moisture is removed.

The dryer is about 4000f so that it can work to specification.

Coating and Pressing

The veneer is placed in a feeder and is made to run through a glue curtain that coats the sheets.

The wood grain is layered up oddly, and the wood is 15 layers thick before reaching the pressing stage.

Then the pressing stage compresses the layers with weight and heat.

The glue is heated to bind the sheets together firmly.

The boards are then finally coated and cut.

Plywood Durability

Plywood is very durable and is manufactured to be of high impact resistance.

Different grades of plywood have various levels of durability and levels of resistance to high impact.

So, consider the level of impact the plywood will come under when considering the grade of plywood that will be purchased.

Plywood should not be exposed to excessive humidity – this is damaging to the board and affects its durability.

Exposure to adverse conditions will affect the service life of the wood.

Plywood Water Resistance

Plywood comes in different grades, and performance in wet conditions will vary.

The truth is that wood products do not mix well with water exposure.

Plywood is treated with resins which may slow water damage to the plywood.

A small amount of water exposure or moisture will not damage the plywood.

Excessive exposure to water will cause the wood to absorb the water and expand, causing the wood to split.

In summary, avoid exposing the plywood to excessive water.

Pros of Plywood

• Plywood is strong and it can occasionally carry heavy loads and come under strain. This makes it very suitable for flooring or formwork.
• Plywood cross-graining helps to distribute the impact on the graining.
• Plywood’s laminated structure provides stability in construction work.
• Plywood is lightweight compared to OSB and is easy to work with. Its light weight makes it suitable for furniture making. Lightweight plywood does not have reduced strength.

Cons of Plywood

• Plywood costs more to get a certain size of plywood compared to OSB of the same size. Although, there are high-grade types of OSB that may cost as much as plywood.
• Another drawback is that plywood can be difficult to saw through. The wood tends to splinter, creating rough and uneven edges. Sawing plywood requires expertise.
• There’s a concern that plywood releases volatile organic compounds into the air. VOC is an unsafe compound that can be poisonous to humans. This process of the release of VOC is common during construction and handling.

Conclusion

OSB and plywood are great for construction work.

OSB is cheaper than plywood but that does not mean it is inferior in quality.

Plywood may be more suitable for flooring than OSB.

Make sure to consider such pros and cons before purchasing any timber building product.

MDF is a popular alternative to natural wood utilised in various settings.

MDF is denser than plywood, another synthetic wood, and a relatively cheaper option.

One major problem with MDF is its low tolerance to humid and moist conditions. It tends to absorb water which destroys the material.

In this article, we’ll take an in-depth look at MDF and outline steps to waterproof it effectively.

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Table of Contents

1. What is MDF?
2. Is Standard MDF Waterproof?
3. Benefits of Using MDF
4. Making MDF Waterproof
5. Tools Required
6. Conclusion

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What is MDF?

Medium-density fibreboard (MDF) is a type of engineered wood.

It consists of wood by-products, shavings, sawdust, and other residual fibres.

The wood by-products are dried and grounded into powder.

It is then mixed with wax and resin and subjected to a high-pressure press into flat panels by mechanical means.

There are various types of MDF, including:

• Standard MDF
• Ultralight MDF
• Moisture Resistant MDF
• Fire Retardant MDF
• Exterior Grade MDF
• Valchromat MDF
• Melamine Faced MDF

Is Standard MDF Waterproof?

Standard MDF is not waterproof, and only short term exposure to water will damage it because it will typically be absorbed.

This exposure will cause the MDF to swell, rendering it useless.

MDF is made of wood fibre bound together by resin adhesive, making it moisture resistant.

But it is not waterproof, and little cuts or prolonged exposure to water will damage it.

For this reason, standard MDF is suited for indoor use, such as for cabinets, shelves, and other objects in places with low moisture or humidity.

Remember that waterproofing your MDF does not offer protection from prolonged exposure to water however.

Benefits of Using MDF

Besides the fact that MDF is less expensive than plywood, there are other benefits to using MDF in your home.

They include:

• MDF's density and shape make it solid and less likely to warp out of shape.
• MDF is easy to drill and cut without damaging the surface. Its durability is due to its composition.
• It works well with carpentry adhesives and polyurethane glues. In addition, MDF glues easily to most materials.
• MDF can easily be fastened together with screws and nails without damaging the surface.
• It is easy to paint.
• MDF can easily be cut and designed to create decorative door panels and other features around the home.
• MDF is a perfect substitute for plastic laminate and veneer as it has the appearance of real wood without the cost.
• MDF is resistant to termites due to the chemicals treatments (such Boric acid, Borax, and urea-formaldehyde) used when manufacturing it.
• MDF is eco-friendly and can be recycled.

Making MDF Waterproof

There are two methods to waterproof MDF.

You can opt for using manufactured Moisture Resistant MDF, which is a little more expensive than standard MDF.

Or you can paint your MDF with moisture-resistant wood sealant or varnish.

Painting your MDF will require you to apply several coats of wood sealant and waterproof paint to its surface.

Either option provides the MDF with protection against moisture.

However, prolonged exposure to water will damage the MDF regardless of the protection provided.

Tools Required

• A quality wood sealant or varnish
• Paintbrush
• Sandpaper
• Roller tray liner
• Roller tray
• ⅜ inch Roller cover

Step One: Prepare Tools

Fix your ⅜-inch roller cover into its roller.

A ⅜-inch roller is recommended to maximise the spread of the paint on the MDF board.

Place a roller tray liner inside the roller tray.

Step Two: Apply Sealer

Apply the sealer to the edges using the paintbrush.

Ensure that all edges are properly covered, and that there’s no drips.

Proceed to apply the sealant to the surface.

We recommend applying at least two coats to the MDF surface.

Let it dry for at least 5 hours.

Clean the surface of the MDF and prepare tools for painting.

There are different sealants for waterproofing.

The most popular method, and the one recommended is primer sealant.

Other methods of sealant include:

Bondo technique

This method involves applying the Bondo filler across the edges and surface of the MDF.

This provides an adequate seal.

The only drawback is Bondo dries easily, and may not be suitable for larger jobs.

Water & glue technique

The technique is cheap and very effective.

It involves mixing water and glue in a container before applying it to the MDF as a sealer.

The only setback of this method is that you may need to add another coat after it has dried, as it’s not always visible during application.

Glazing putty technique

Glazing putty is a great sealer and easy to sand after painting.

It’s not as hard as the Bondo substance however.

Primer technique

Primers are the recommended sealer as they help bond the waterproof coat to the MDF.

Step Three: Apply Moisture-Resistant Paint

The next step is applying the first moisture-resistant paint coat on both sides.

You can sandpaper the edges to ensure a smooth feel.

Once the coat is dried, it is recommended to apply a second coat to ensure the MDF is properly covered.

Paint the edges of the MDF boards too.

Leave the paint to dry for at least two days.

Conclusion

As mentioned above, MDF is a solid alternative to natural wood.

It is also your best bet if you want something aesthetically pleasing, yet more economical than plywood.

Remember, you don't want to expose MDF to humid or moist conditions, so you should be mindful of where you’re going to use it.

There are types of MDF that can work in harsh or wet weather conditions, so you should always do your research before using this highly versatile building material.

As soon as you walk into a kitchen, the first thing you notice is the kitchen cabinet doors.

The style, the material and colour are all important aspects, and this inevitably makes it even more important to choose carefully and wisely.

It's also critical to take into account the various pros and cons that different materials offer.

This will help you strike the right balance between style and quality.

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Table of Contents

1. Solid Wood
2. Melamine Faced Chipboard (MFC)
3. Veneered Chipboard
4. Veneered MDF
5. Foil Wrapped MDF
6. Painted MDF
7. Vinyl Wrapped MDF
8. Acrylic Faced MDF
9. Toughened Safety Glass
10. Conclusion

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Solid Wood

Image credit: Pixabay

Solid hardwood is one of the most expensive options.

But there's no denying that you'll be investing in durable and high quality kitchen cabinet doors.

Solid wood is able to put up with the daily wear and tear that kitchen doors are subjected to.

This includes the numerous bumps and knocks that are even more common if you have children or pets.

Another key advantage of solid wood doors is they always stay in style as they have a timeless beauty.

Moreover, there are countless colours to choose from.

For many people, nothing beats that natural look that can be offered by the various types of solid wood options.

These include cherry, oak, pine, hickory, birch and walnut.

Solid wood doors are also customisable according to one's preferences.

Despite the numerous advantages of solid doors, one will need to bear in mind that besides being expensive, they also require considerable maintenance.

A waterproof finish should be given to such cabinets, and it's crucial to clean them with specialised non-abrasive products.

Such solid wood doors also have the drawback of being reactive to humidity, so they can warp and crack.

Melamine Faced Chipboard (MFC)

Image credit: CBJ Ltd

MFC kitchen doors are another popular option as they are affordable, yet very stylish.

If you cannot afford hardwood doors, melamine face chipboard is a great alternative as they're far more budget-friendly.

They're also available in a wide variety of colours, from a natural finish to a more contemporary look.

MFC is made from resin coated particles of softwood.

Such particles are evenly spread out over a flat plate.

Then, they are bonded together by applying extreme high pressure.

Subsequently, the melamine face is laminated on top as a decorative finish.

During this manufacturing process various textures can be applied.

This allows for a variety of finishes that can be achieved, including matt, gloss and embossed wood grain effects.

Veneered Chipboard

Image credit: Mebelissimo

Veneered chipboard is a fairly common kitchen door material.

A veneer is a thin layer of timber which is bonded to the chipboard and then sealed with stain and/or lacquer.

Veneered chipboard cabinet doors are quite affordable and durable.

Another advantage is they preserve consistency of the grain colour and pattern.

Veneer cabinets can provide both the look as well as the feel of natural wood, and they are easy to maintain.

However, it's important to remember that they should not be subjected to excess moisture.

If this occurs, the veneer can loosen from the substrate, resulting in a bubbled look in certain areas.

Veneered MDF

Image credit: Builder Depot

Similar to veneered chipboard, the main difference is the veneer is bonded to a medium density fibreboard substrate, instead of chipboard.

MDF is considerably durable and yet relatively inexpensive, making it a great option for many.

Veneered MDF doors do not require specialist care as they can be maintained simply by wiping down with a soft, lightly dampened cloth.

It's important to avoid excessive exposure to water as they are vulnerable to moisture penetration.

Any nicks and scratches can be buffed out easily in many cases.

So it's safe to say that such doors are resistant to warping and are reasonably durable.

Foil Wrapped MDF

Image credit: Kitchen Findr

In this case a layer of vinyl or foil is wrapped and bonded onto an MDF substrate.

Foil consists of paper mixed with resin, whereas vinyl is a thin layer of plastic.

Both are commonly used to manufacture kitchen cabinet doors as they offer increased durability coupled up with various stylish options.

This material is very versatile as it can be printed in countless different ways.

From natural wood grains to a simple single colour finish, as well as opting for matt or high gloss depending on one's preferences.

Painted MDF

Image credit: Advanced Timber Finishing

Painted MDF is another option which is fairly common.

Applying several coats of high quality paint or lacquer to the MDF substrate offers a greater choice of colours and styles to suit diverse preferences.

First the doors are primed and cured.

Following such a process the doors are finely sanded, and a top coat is applied.

Subsequently, the doors are returned to the oven for additional curing.

This helps to create a tougher, more durable surface.

Needless to say, the most obvious benefit of such kitchen doors is there's countless colours one can choose from.

Having said that, it is important to be realistic and choose a colour which will have a timeless appeal.

You do not want to end up getting bored of it or find it looks dated in a few years time.

Some colours may go out of fashion, so bear this in mind when choosing.

Painted MDF doors have the advantage of lasting longer and you won't need to worry about peeling.

It's a good idea to store a pot of the colour matched touch up paint however, so in case of any chips or scratches you can repair them easily.

Painted MDF doors may end up being quite expensive if the kitchen is quite large.

So bear in mind that this is definitely not the option which can offer you the best in terms of durability.

Vinyl Wrapped MDF

Vinyl wrapped MDF has become one of the most popular options.

This material is relatively affordable, and yet it can still offer you considerable durability.

Vinyl wrapped doors are either compressed or composite wood doors, onto which a vinyl wrap is laid.

As a result, such doors are highly resistant to moisture and humidity, as well as changes in temperature, making them ideal for a kitchen.

Vinyl wrapped MDF is available in a wide range of colours and patterns, allowing you the possibility of being spoilt for choice.

Acrylic Faced MDF

Image credit: MIH Building Material

Acrylic faced MDF cabinet doors are a relatively cost effective option.

Such doors are made by applying a thin layer of high gloss acrylic to the MDF.

This is bonded to the substrate, offering a stylish and more durable finish to the doors.

Acrylic is a non-toxic material which is ideal to give a high gloss finish to kitchen doors.

It is particularly popular for those who have a rather small kitchen, as the high gloss finish will reflect light, making the kitchen look more spacious.

Cleaning and maintaining such cabinet doors is also simple.

One will not have to worry about cracking or chipping as this is highly unlikely with such a material.

Moreover, the vast range of colours that one can choose from is a great advantage.

The main drawbacks of acrylic faced MDF cabinet doors is that regular cleaning is often necessary.

Fingerprints, dirt and stains can be a common problem, and are easily visible on the glossy surface.

Toughened Safety Glass

Image credit: Pexels

Glass doors used to be very popular back in the day.

Over the years other materials started to be favoured, but lately glass doors are making a comeback.

Glass doors are made from toughened safety glass and can be quite costly, especially if you have a large kitchen.

Many people favour these doors because they allow you to see what's stored inside the cupboard without having to open them to find for what you need.

On the other hand, it's important to ensure you have a well-organised and tidy setup within the cupboards as everything will be in plain sight.

Such doors are relatively easy to clean and are scratch-resistant.

Moreover, they are not affected by heat or humidity.

Conclusion

Since there are so many different kitchen door material options available, it's a good idea to meet up with a kitchen cabinet specialist to discuss your needs.

They can help to find the right style option which will align with your particular preferences and budget.

Finding a material that's cost effective and able to fit into your home and lifestyle is important.

The kitchen is the hub of the home, so you want to get this important decision right the first time!