Using Pressure Treated Plywood For Roof

Use pressure treated wood in any situation where there s direct contact between the wood and anything that could supply moisture.

Using pressure treated plywood for roof. One of the nice things about plywood is the variety of options you can buy. While many homeowners wonder if they should use pressure treated wood for a specific project the answer is simple. Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for. Pressure treated wood already has a built in water resistance.

Manufacturers produce it by infusing regular plywood with chemicals under pressure to give it added resistance to mold and mildew. Wood for indoor projects should be left as is. Plywood sheathing is ideal for residential and light plywood sheathing is ideal for residential and light construction and every piece meets the highest grading standards for strength and appearance. There are pressure treated grades marine grades that can be used in water fine hardwood options for finish work and cabinetry pre finished panels or simple down and dirty 1 2 cdx plywood.

The sawdust from pressure treated wood is an irritant to the eyes skin and nose. This means posts in contact or buried underground obviously but it also includes any lumber touching concrete or masonry since it s porous and wicks water like a sponge. Galvanic corrosion occurs when electrons move away from an anode toward a cathode. Interior walls are within a climate controlled environment and are presumed to be free of moisture.

The bottom line is that there is a plywood for almost every application. Pressure treated wood is required whenever you attach framing lumber or furring strips directly to concrete or other exterior masonry walls below grade. Most pressure treated wood is treated with chromated copper arsenate. It adds proven performance and durability to new homes room additions and renovations.

I would be concerned that galvanic corrosion could degrade the metal roofing or fasteners. The metal present in the treatment chemical copper is dissimilar to the metal roofing steel. Pressure treated plywood usually has a greenish hue and a slightly oily surface. Where to use pressure treated wood.

Note that this requirement is only for exterior walls as these may wick moisture onto the lumber. Treatment chemicals include chromated copper arsenate cca ammoniacal copper quat acq copper azole ca and safest of all borates.