Business Advice5 min

Is There A More Water-Resistant OSB Board?

The #1 problem on a jobsite? Water. Because when it rains, it pours.

When rain hits before a new house is fully closed in, it can be disastrous not only for your construction schedule but also for your home’s sub-flooring and exterior sheathing.

At a time like that, there’s only one question: Is oriented strand board (OSB) waterproof

Since not all OSBs are created equal, here’s what you need to know.

What OSB Is And How It’s Made

First, the basics: OSB is a type of engineered wood formed by adding adhesives and then compressing layers of wood strands (flakes) in various orientations under heat and pressure. 

OSB is typically made with industrial grade adhesives that seal and bond the individual wood strands together. In addition to the adhesive, a water-resistant wax coats the wood strands for additional protection. Lastly, the edges of each OSB panel are sealed, adding more protection against water. This process makes the OSB board more water-resistant than other kinds of construction panels. 

So, OSB is highly water-resistant. However, to answer the question "Is oriented strand board waterproof?" The answer is: not completely. That's because it's virtually impossible to prevent some water absorption in a wood-based product and moisture can be absorbed through cuts in the panel and the wood strands can swell. Sealing field cuts will help prevent moisture absorption.

All of this makes OSB a superior option to particle board for structural applications, and to plywood for moisture resistance. 

LP Legacy® Premium Sub-Flooring: A Whole Different Kind of OSB

LP took OSB to a whole new level when it created LP Legacy® Premium Sub-Flooring, which is not only proven tough but also APA-verified for exceptional stiffness and strength. 

In fact, LP Legacy sub-flooring is the most moisture-resistant OSB that LP manufactures. 

As far as its water-resistant properties go, don't take our word for it. Check out this one-minute video demonstration

What Makes LP Legacy® Premium Sub-Flooring More Moisture-Resistant?

The key to the high moisture resistance of LP Legacy sub-flooring is how it’s made. 

LP Legacy panels are packed with more strands, resin and wax to provide exceptional resistance to moisture and edge swell. The strands are aligned in a specific orientation, sent through a press to bond at the molecular level and then cut to size.

Plus, the water-resistant resin used to manufacture LP Legacy Premium Sub-Flooring utilizes Gorilla Glue Technology® for unmatched moisture resistance and exceptional stiffness. 

That’s not the only advantage. LP Legacy panels also feature RainChannel® notches on one four-foot end to improve drainage when rain suddenly interrupts your construction schedule. And it’s easy to install, as this brief video demonstrates.

LP Legacy Premium Sub-Flooring comes with a unique Covered Until It’s Covered® no-sand warranty plus a lifetime limited warranty that lasts as long as the home.

LP WeatherLogic® Air & Water Barrier: A Better OSB for Both Walls and Roofs 

LP WeatherLogic® Air & Water Barrier is a Structural I rated OSB wall and roof sheathing panel that offers structural defense and protects against air and water infiltration.

The panels’ permeability allows moisture to dry, an innovation that provides greater indoor comfort for years to come.

The LP WeatherLogic System Was Designed To Solve A Real-World Problem

LP saw a real need and then developed an innovative sheathing panel to meet it. 

To create a Structural I OSB panel, LP’s innovative manufacturing process combines wood strands oriented in cross-directional layers with waxes and resins for greater cross-panel strength and stiffness. 

An integrated, water-resistive overlay is added to finish LP WeatherLogic panels, completing an integrated wall sheathing panel that provides both air and water protection. Rated for both wall and roof applications, the system eliminates the need for secondary housewrap (or roof underlayment, in most cases) while increasing the structural integrity of the home.

As The Song Goes, You Can’t Stop The Rain

You can’t stop the rain, but you can certainly minimize water damage to your sub-flooring and sheathing with both LP Legacy Premium Sub-Flooring and LP WeatherLogic Air & Water Barrier.

For more information about LP Legacy Premium Sub-Flooring, visit or click here

To learn more about LP WeatherLogic Air & Water Barrier, visit or click here

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