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roofing why do we need plywood over our old solid sheathing

Roof Sheathing Calculator – Estimate the Plywood Needed for a Roof.. divide by the area of a 48 sheet to find how much sheathing is needed. Find the Area of a Roof.. Find what you need for your roofing project with our roofing installation calculators and cost guides.This article discusses the requirements – specifications for roof sheathing (nailers or plywood or osb) and underlayment (roofing felt) for wood shingle – wood shake roofs, including Roof decking needed under wood shingles/shakes: roof sheathing requirements, Underlayment (roofing felt) requirements under wood shingles – shakes, Using a shingle course felt interlayment on wood roofs, Using battens to provide ventilation for wood shingles – shakes, Using a ventilating underlayment for wood.I’m going a reroof in two weeks time, where we are removing all the old roof covering, and the old sheathing (delaminated and rotted 3/8 plywood) and replacing it with new 5/8 T&G plywood.Seattle Roofing – Sharp Roofing is a gaf factory certified Master Elite Seattle Roofing Contractor. We are licensed and our work warranted.Granted, some of the roughly $200,000 increase in home value had to do with the Austin market’s. which uses a thin veneer of real wood or bamboo over structural plywood, tends not to wear as well.

This video,, can also be seen at to Install New Sheathing Over Old Spaced Sheathing for Re-roof Projects. Need to report the video?. This video will provide you with a few ideas and methods I used in the past for.Solid Sheathing and Asphalt Shingles. These two descriptions, along with "Skip Sheathing", are referred to in the IRC and the IBC. but there are no definitions. Where we’re having an issue is for a reroof with asphalt shingles. Both the IRC and IBC call for asphalt shingles to be installed over solid sheathing.If your old house has 1 inch dimensional sheathing (1×4 or 1×6 or greater), you can use plywood or OSB for the replacement, even if you’re only partially replacing your roof. The old sheathing boards are likely three-quarters of an inch.plywood_3The cure. If you want new asphalt shingles installed then solid sheathing must be applied first. This can be exterior grade plywood or oriented strand board (osb).