Is Duplex Board Waterproof?

Duplex board or double-layer plywood is used in many roofing applications such as roof trusses, roof sheathing, purlins and sidewalls. Here’s the question asked by a reader recently on whether a duplex board is waterproof? So, let’s find out if duplex board water proof and how?

What is Duplex Board?

When it comes to making a roof waterproof and water-resistant, roofing contractors often rely on something called a Duplex board. But what is a Duplex board, exactly? And is it really waterproof? This post will address those questions. Keep reading for more information about duplex board!

Is Duplex Board Waterproof?

Plastic or steel roofs are waterproof and don’t require any extra protection, but for wooden roofing you’ll need to use a weather sealant such as Dichlorobenzene. It’s worth applying weather sealant annually, even if your roof is in good condition; regular application helps prevent water damage and protects against insect infestation.


You can buy it online or at most hardware stores, and it comes in a variety of colors – making it easier to match with existing timber. Make sure you apply it evenly across your entire roof. This will ensure that there aren’t any holes or gaps that could cause leaks when rainwater runs off your house.

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