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.
LP Building Solutions uses engineered wood to create a portfolio of products that help professionals build smarter, better and faster. The innovations of engineered wood siding are relatively new. For instance, LP® SmartSide® Trim & Siding was introduced in 1997. Thanks to its advanced manufacturing process, it is one of the most durable siding solutions available. Sometimes people are skeptical of things that are really that good. So, let’s crush a few myths with engineered wood facts.Continue Reading
Pier and beam design was among the most popular foundation techniques until the 1960s when concrete technology improved its floating slab system. Many builders use slab-on-grade construction—especially in warmer regions. We’re going to find out why professionals Jordan Smith of @jordansmithbuilds and Kyle Stumpenhorst of @rrbuildings chose pier and beam over slab-on-grade for the All-in-LP Build in Bellville, Texas. But first, let’s delve into pier and beam foundation.
From destructive hurricanes to fierce tornadoes, it seems news of catastrophic events is happening with alarming frequency. In fact, on March 3, 2020, an EF3 tornado tracked less than one mile from the LP Building Solutions headquarters in downtown Nashville, Tennessee, ripping through homes and businesses. While no traditional building can withstand the tremendous forces of disastrous weather events, it reminds us that embracing resilient construction and adopting stronger building codes could help protect our families, friends and neighbors.
As a building industry professional, recent market changes have likely impacted the way your business operates. As you adjust to a new normal, seeking out building material companies with proven efficiency and reliability from third-party testing can significantly influence the success of your business.