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.
As a leader in building solutions, LP Structural Solutions is consistently moving in the direction of greater resiliency. Each innovative building solution is viewed through that lens, as well as how it can help achieve LP's overall goal of Building a Better World™. But why this direction? What led LP to focus on resilience in construction? Craig Miles, Director of OSB Sales & Marketing, explores how past trends inform LP's work on modern building techniques today.Continue Reading
Coming off an unprecedented year, the busiest season for selling siding is almost underway! COVID-19 is still a significant consideration as you attempt to move forward with your siding business while taking learnings and challenges from the pandemic into consideration. We talked with Erik Perkins of Perkins Builder Brothers to get insight straight from the jobsite about COVID-19's impact, tips for prepping for a new season, and more. Read on to see how LP can support you with one of the most durable siding options out there as your business ramps up!
Recently, homes are trending toward smaller, more compact sizes. Using extra-tall, cathedral or vaulted ceilings can create the illusion of a larger living space. But how do you avoid installation problems when insulating a cathedral or vaulted ceiling? How do you avoid problems when insulating an open ceiling?
When it comes to installing sub-flooring, one concern rises to the top for many professionals: rain. No matter your geographical area, dealing with some amount of water in sub-floor panels during the installation process is inevitable. That's why it's important to know how to protect the sub-floor during construction and how to prevent water pooling on sub-floor panels.