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pressure treated plywood for roof under deck

The Minimum Plywood for Roofing | Home Guides | SF Gate.The thickness of plywood used for roof decking depends on the roof slope, the spacing of rafters and the weight of other material to be put over the decking, as well as the design "load" — the amount of pressure exerted by various forces and the weather, especially weight of snow or ice accumulations. The wider the rafter...

treated wood and galvanized roof | Ask The Experts Forum | Metal ....I've just put a plain, galvanized (shiny, no paint or color) metal roof on my home addition. As my house is two stories, the wall above the roof will need the siding replaced as I tore it off for construction. I was thinking of using treated pine and staining it for the siding. My question is will any water that runs off this siding and...

Type of Plywood Used on Roofing | Home Guides | SF Gate.OSB and plywood come in thicknesses ranging from 5/16 to 3/4 inch, and the thickness needed for a particular roof depends on several factors, including rafter spacing, expected load and roof design. Plywood sheets are available in 4-foot widths and lengths up to 10 feet. The maximum length of OSB sheets is more than...

Under-Deck Roof | Family Handyman.Convert the space under a second-story deck into a dry, spacious patio by installing this simple, under-the-deck roof and gutter system. ... Attach 2×4 pressure-treated purlins to spacer blocks sized to create a slope from front to back. Then screw the panels to the .... Reader Project: Reclaimed Lumber Decking. How to Build...

materials - What is better for a roof, plywood or OSB? - Home ....They're required by 2012 IRC to use a fire retardant treated plywood on the roof within 4' of the UL assembly (the firewall that's between each unit). ... roofing cost, plywood panels are often used around the edges of a roof (near the eves) because this is where there is higher wind pressure pulling the nails...

Preserve and Protect Your Plywood Roof Deck From Water Damage ....See the products and resources you need for your plywood roof deck project. ... If deck is old, split, or pressure treated: Apply 1 coat of Ames? Super Primer 1 gallon per 200 sq. ft. and allow to dry ... Use seam tape on plywood joints, flashing, where deck meets the house (seam tape can be seen upon finished system.).

Special Report: Use of treated wood in roof assemblies, February ....The long-term performance under various conditions of the current, new generation of treated wood products still is largely undetermined. ... wood is oftentimes used in as a component that interfaces with or is in direct contact with metal—metal fasteners, metal flashings and other metal accessories, or metal roof decks.

Use of Preservative-treated Wood Requires Certain Precautions.Apr 23, 2015 ... Fire-retardant-treated wood: Pressure-treated lumber and plywood that exhibit reduced surface-burning characteristics and resist propagation of fire. ... AWPA U1 designates preservative systems and retentions that have been determined to be effective for protecting wood products under specified...

What type of plywood is used for roofing? - Quora.Contractors love plywood for its water resistance, structural stability and obvious low cost. They love strand board as it costs even less and is comparable to plywood on the other two counts. Roofing contractors in Texas prefer plywood as it is one of the most favorite roofing materials and is very easy to work with. Roofers...