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.
Believe it or not, that’s not such an unusual question. A lot of builders aren’t sure about how to install a radiant barrier or—for that matter—how a radiant barrier works. Although radiant barriers have been around for a couple of decades now, some builders have yet to discover the remarkable advantages that they offer. So let’s look into radiant barriers, how they work, what they do, and how to install them.Continue Reading
Whether most of your construction projects use engineered wood, plywood or OSB, proper wall sheathing installation helps protect the home from wind and water penetration. Installing wall sheathing panels is fairly straightforward, yet one question we do see on social media is whether sheathing should overlap the foundation. Let’s take a look.
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.
With the rise in popularity of homebuilding TV shows and access to an abundance of exterior products and accessories, homeowners are more aware than ever of their home’s exterior. While style and design are top-of-mind for your clients, efficiency is also on your radar as a builder. Thankfully, you don’t have to choose between the two. We talked with building pro Kyle Stumpenhorst about the ways a versatile product suite like LP® SmartSide® Trim & Siding can help achieve a customizable and efficient build.