By Kelin
Thu, Apr 2, 2026

What is The Best Waterproof Decking Material?

Outside living areas are built around the deck. It not only adds to the space inside, but it’s also a great place for family get-togethers and relaxing. How long the deck lasts, how nice it looks, and how much it costs to maintain all depend on the waterproofing of the decking material you choose. PVC, capped composite decking, and aluminum are some of the best waterproof decking products.

This article tells you about a few of the best waterproof deck materials on the market to help you make an informed choice.

Table of Contents

Why Choose Waterproof Deck Materials?

When it comes to classic wooden decks, water is their worst enemy. The following problems can happen to decks that are subject to water erosion:

Rotting and Mold Growth: When wood is exposed to damp conditions for a long time, water can get deep into it and break down the fiber structure. Also, damp places are perfect for mold and fungus to grow, which can make decks look bad and may even be harmful to your health.
Warping and Cracking: Boards that soak up water constantly grow and contract. This makes the deck planks bend, crack, and twist, which weakens the structure and flatness of the deck as a whole.
Pest Infestation: Pests like termites like wood that is damp and rotting. These bugs do more damage to the construction of the deck, which makes it very unsafe.
Safety Hazards: When deck surfaces are wet from standing water, they become very slippery, making it much more likely that someone will slip and fall.

To ensure long-term, worry-free use, it is important to choose a waterproof decking material.

Top Waterproof Deck Materials

At the moment, there are three main types of waterproof decking products on the market: PVC decking, capped composite decking, and aluminum decking. Each one works best in certain situations and meets certain needs.

PVC Decking

PVC decking is a purely synthetic board made from polyvinyl chloride. It is completely waterproof because it doesn’t have any wood or vegetable fibers in it. Some of its benefits are:

Absolute Moisture Resistance: This is the best thing about PVC decks. The material doesn’t soak up water, so problems like rot, mold, and bug infestation are stopped at their source. If you live in the wet south or the humid coast, your PVC decking will stay in good shape.
Durability: High-quality PVC decks don’t fade or chalk when exposed to sunlight. It’s also very resistant to scratches and stains.
Ultra-Low Maintenance: You don’t have to sand, stain, or seal PVC decks. Simple soapy water and a soft-bristle brush can be used every day to clean. It won’t break apart as wood does, so you can walk on it without shoes.
Aesthetic Modernity: PVC decking comes in a lot of solid colors and modern color schemes, which gives designers more ways to be artistic.

However, while PVC decking is waterproof, it also has several notable drawbacks:

Higher Cost: When it comes to cost, high-quality PVC decks are usually more expensive than pressure-treated wood.
Thermal Expansion and Contraction: Since PVC is a plastic, it can respond to changes in temperature by expanding and contracting. So, when installing, it’s important to carefully follow the manufacturer’s instructions and make sure there is enough expansion.
Surface Temperature: When it’s really hot outside, dark-colored PVC decks can soak up a lot of heat and get very warm. Going barefoot might make your feet feel like they’re on fire.

Capped Composite Decking

Uncapped composite decking is made of reclaimed plastic and wood fibers, which makes it somewhat waterproof. But if it stays wet for a long time, the wood fibers inside may still soak up the water. Capped composite decking has a polymer cover that protects the core material on all sides. Some of its benefits are:

Superior Water Resistance: Capped composite decking is very waterproof because it has a covering layer. It successfully stops water from getting in, which greatly lowers the risk of rot and mold.
Realistic Natural Appearance: Capped composite decking not only provides waterproofing but also realistically replicates the grain and color of natural wood. Its appearance and texture are the closest to real wood among all materials.
High Durability: When it comes to scratch, stain, and fade protection, capped composite decking really shines. The way it looks stays the same for years.
Low Maintenance: Like PVC, capped composite decking doesn’t need to be sanded, stained, or sealed. Cleaning up every day is easy.

To sum up, capped composite decking is the best choice for natural looks, waterproofing, durability, and low upkeep. It does cost more than regular composite decking, though. Also, moisture may still get through if the protective layer is badly broken while it is being installed or used. So, careful placement is very important.

Learn More: What Is Capped Composite Decking?

Aluminum Decking

Aluminum decking represents a relatively niche option in the market. Crafted from extruded aluminum alloy with a powder-coated finish, its advantages include:

100% Waterproof and Corrosion-Resistant: Aluminum alloy doesn’t rot or grow mold. It is a forever waterproof material.
Unmatched Strength: Aluminum decking boasts exceptional rigidity and outstanding scratch resistance.
Cool Surface: Aluminum’s surface stays much cooler than PVC or composite materials because it reflects the sun’s heat. Even on hot summer days, it stays pretty cool, so you can walk through it barefoot.

However, aluminum decking also has notable drawbacks:

Highest Cost: Aluminum decking usually has the highest costs for both materials and installation compared to other choices.
Distinctive Appearance: The metallic texture and unique hollow structure of aluminum decking give it a look quite different from traditional wood. Modern, simple, or industrial-style buildings look better with this style.
Noise: Aluminum decking makes more visible footfall sounds or echoes than other materials when it is walked on.
Risk of Surface Dents: Even though metal doesn’t scratch easily, hard hits can leave permanent dents on the surface.

How to Choose the Most Suitable Waterproof Deck Material?

There are some good things about all three of these waterproof deck materials. You can choose the best choice for their needs.

If complete waterproofing and low upkeep are very important to you and you have enough money, PVC decking is the best option.
Capped composite decking is the best choice for people who want a look that is most like real wood and the best waterproofing.
In hot places, aluminum decking is better because it stays cool underfoot.

How to Choose the Most Suitable Waterproof Deck Material?

Conclusion

To choose the best waterproof decking material, you need to think about how much it will cost, how it will look, how much upkeep it needs, and how long it will last. Premium materials like PVC, capped composite decking, and aluminum may cost more than regular wood at first. But they are much better purchases in the long run. Because they are waterproof, last a long time, and don’t need much upkeep.

No matter what material you choose, it is very important to have a professional fix it. Working with an experienced builder makes sure that the substrate is properly prepared and that drainage is planned. For more information, please contact EVODEK. We sell high-quality composite decks and are happy to give you advice.

FAQ

Do These Waterproof Decking Materials Become Slippery in Winter?

Slip resistance is an important safety factor for all decking materials. It’s especially important when it’s wet, icy, or cold outside.

PVC and Capped Composite Decking: Most high-end brands make their products less likely to slip when they’re making them. They press textured designs into the surface to make it less slippery. They are much less likely to slip than smooth tiles or wet wood, even when they are wet.
Aluminum Decking: Aluminum panels typically achieve slip resistance through embossed surfaces. These raised patterns provide effective traction. While any surface becomes slippery when icy, textured finishes minimize risks.

Therefore, always choose reputable brands with slip-resistant designs. These waterproof decking materials guarantee adequate slip resistance under normal use.

Does Composite Decking Get Hot in Summer?

Yes. The deck surface absorbs energy from sunlight, causing it to heat up. When it’s really hot in the afternoon, the surface of composite decks can get very hot. Solutions include:

Choose Light-colored Decking: This is the most direct and effective approach. Colors like beige or light gray reflect more sunlight, resulting in much lower surface temperatures.
Add Shade Structures: Add an awning or trellis to the deck, or plant trees that lose their leaves in the fall. Direct sunlight is blocked by physical obstacles, which lowers the temperature of the whole deck area.
Place Outdoor Mats: Place light-colored outdoor mats where there will be a lot of foot traffic or chairs. They make the deck look better and keep you from coming into close contact with the hot deck surfaces.

Which is Better: PVC Decking or Capped Composite Decking?

Both are excellent waterproof decking materials, but they differ in emphasis.

Durability: Both perform exceptionally well. PVC and capped composite decking that is of high quality is very resistant to scratches, marks, and fading.
Appearance and Texture: Capped composite decks work really well here. Both how it feels and how it looks are more like real wood.