DIY Builds
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Which is stronger OSB or particle board?

To sum it up in a sentence, OSB is particle board's stronger cousin. (Both are engineered wood products made from wood pieces combined with resin; OSB features long wood "strands," while particle board is comprised of much smaller wood chips.)

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Using basic home-improvement supplies as interior design details is par for the course these days. First came pegboard storage, then bare plywood cabinetry, and now, we're seeing another material take off: oriented strand board, or OSB. Never heard of it? To sum it up in a sentence, OSB is particle board's stronger cousin. (Both are engineered wood products made from wood pieces combined with resin; OSB features long wood "strands," while particle board is comprised of much smaller wood chips.) But unlike particle board, OSB has quite the attention-grabbing texture—those layers of wood strands create a funky motif that looks kind of like a flattened hay bale. All you have to do is construct some cabinet fronts or a wall or a headboard with the stuff and you've made a big design statement—just check out the inspiration we found. Of course, as with any material, there are pros and cons to this one. We also talked to Elizabeth Moody, Home Depot’s plywood merchant, to find out everything we should know about OSB:

The pros

The biggest pro of them all is cost. "OSB is generally less expensive than construction plywood for the same relative thickness; it can be anywhere from $4 to $10 per sheet," Elizabeth explains. "The price difference varies based on market conditions; both plywood and OSB are commodities, and pricing changes weekly." And when it comes to durability and versatility, OSB measures up to plywood. "In construction situations, for the same thickness, OSB is as strong as plywood," she says. Plus, it's easy to cut down to size and, though it will feel rough when you buy it, it takes well to sanding. If you'd rather not leave your OSB au naturel, it can be finished with a urethane sealant, which Elizabeth says will help stop any strands from flaking off; "OSB is also paintable, though I recommend a high-quality acrylic latex paint."

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Is OSB more fire-resistant than plywood?

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.

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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