Is it OK to use OSB for shed floor?

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Oriented strand board, plywood and particleboard are all fabricated wood products, made by fastening pieces of wood into a solid form. Plywood is made by gluing together thin sheets of wood veneer with grains alternating. OSB and particleboard are both made of chips or flakes, but the pieces in OSB are larger and carefully oriented to provide an alternating grain pattern like plywood. Particleboard is made of smaller chips, even sawdust.

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OSB More Common

Plywood was once the traditional substitute for solid wood in flooring sheds and other buildings, but OSB has become more common. In 2006, manufacturers produced 26 million square feet of OSB and 16 million square feet of plywood. A major reason is cost: OSB is typically far less expensive than plywood of comparable size. Particleboard also is cheap but lacks the strength of plywood or OSB.

Larger OSB Panels

OSB and plywood are both commonly sold in 4-by-8-foot sheets, but OSB can be made in much larger panels, up to 8-by-24 feet. Using larger OSB panels can be an advantage when flooring a big or odd-size shed, reducing the number of joints in a floor. Structurally, OSB and plywood are very similar in strength and ability to hold nails or screws; OSB may have greater shear strength -- the ability to span distances -- than comparable thickness of plywood. Plywood shed flooring is usually 3/4 inch and OSB 5/8 inch thick.

Subject to Moisture

The major disadvantage of OSB as shed flooring is that it is more susceptible to moisture, especially at the edges. Edges, when wet, can swell up to 15 percent, opening the way for water to get into other shed elements and eventually causing the OSB and other wood to deteriorate. Plywood expands evenly when wet, dries more quickly and returns to its original shape, which can be somewhat overcome in a shed floor with thorough sealing or painting and protection from moisture underneath by elevating the floor.

Tongue-and-Groove Style

A tongue-and-groove style of OSB is best for shed flooring. These panels have a protrusion, or tongue, on one edge, which fits into a slot or groove on an adjoining panel, adding strength to the connection and also reducing the chance of moisture penetration. OSB flooring in a shed can support heavy weights, such as large lawn implements or tool cabinets. OSB has a rough side and a smooth side and should be installed as flooring with the smooth side up to reduce chances of flaking and chipping.

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Does it matter which side of OSB faces?

Answer. OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. When the grade stamp is covered by roofing, the building inspector will not be able to confirm that the correct OSB roofing panel was used.

osb.westfraser.com - Which way should you install OSB on a roof? - West Fraser

Question

Which way should my OSB roof board’s be installed?

Answer

OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. When the grade stamp is covered by roofing, the building inspector will not be able to confirm that the correct OSB roofing panel was used. The screened surface also provides a little more traction for construction workers during installation. The same goes for wall sheathing and flooring panels; always install with the grade stamp up so that inspectors can do their jobs easily. Having said that, it is very important that the sheathing be installed with the strength axis perpendicular to the trusses/rafters. The strength axis is usually the long direction of the panel but the grade stamp will indicate it. Be very careful on hip roofs along the hip to make sure the strength axis does not mistakenly get parallel to the supports as that may result in the panel exceeding the maximum span allowed for that thickness. Sagging may result if panels are installed incorrectly.

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