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Inspiration2 min

How Fire-Rated OSB Outperforms FRT Plywood

Both fire-rated OSB and Fire Retardant Treated (FRT) plywood are commonly used in fire-rated wall sheathing and roof deck applications. Because these materials are always evolving, it’s good for architects and builders to know how they compare to each other.

An engineered wood product like LP® FlameBlock® Fire-Rated Sheathing combines a layer of ignition-resistant, cementitious coating with a layer of OSB. It carries an Exposure 1 classification, which means it can withstand normal exposure to moisture during construction. In contrast, some fire-retardant treatments are applied after the plywood is manufactured – and the treatment is sometimes water-soluble, requiring it to be protected from moisture during construction. 

A fire-rated OSB product like LP FlameBlock offers both flame-spread resistance and burn-through resistance in the same panel, as verified in tests like the 30-minute Class A Flame Spread Rating (ASTM E84, UL723) and 15-minute Thermal Barrier Protection test (UBC 26-2).  FRT plywood has a flame spread rating, but no rating for burn-through resistance. 

Fire-rated OSB sheathing has load/span and shear design values that are superior to FRT plywood at the same thickness. In addition, engineered wood sheathing reduces dead load and wall thickness versus FRT plywood. This gives architects more flexibility in designing wall openings, plus more options in framing and bracing to meet structural requirements.

When architects specify fire-rated OSB sheathing, it’s important for builders and subcontractors to “respect the spec” and stick with a material like LP FlameBlock that has so many advantages over FRT plywood.

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Inspiration3 min

HOW TO CREATE CURB APPEAL WITH SOFFIT, SIDING AND TRIM

Many of your clients may not consider the value—or impact—that soffit can have on their home. They may focus on siding and trim, while soffit isn’t top of mind. However, when it comes to exterior home upgrades, you have the chance to discuss why installing good soffit is critical to the home’s structure as well as how it can contribute to curb appeal.

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News & Stories3 min
SUSTAINABLE CONSTRUCTION WITH LP BUILDING SOLUTIONS

As homeowners become increasingly dedicated to sustainable solutions for their homes, building professionals must also respond by improving environmental sustainability in construction. The benefits of building with the environment in mind are endless—and when sustainable products are built for durability and strength as well, it’s an all-around win.

Business Advice3 min
A Structural System Approach to Moisture Management

As builders set their sights on constructing more durable, resilient homes, combating moisture concerns—both during and after the build—is critical. Let’s see how professionals are using exterior sheathing as a one part of their moisture management solutions.

Business Advice3 min
What Architects Need to Know About the Latest LP® FlameBlock® OSB Evaluated Assemblies

Finding the proper fire-resistance-rated OSB assembly that meets code compliance and a building’s structural requirements can be tricky. This is true especially in today’s building environment when architects are asked not only to maximize space and building performance but overall cost-effectiveness as well.