Do I need to add a layer of roofing?

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October 27, 2021 at 7:26 a.m.


I bought a house 1 year ago and found out that the roof decking is 1/4 plywood. I will be replacing the shingles in the next couple years, should I add another layer of roof decking onto the existing decking?

October 27, 2021 at 7:28 a.m.

John Stout from Go Roof Tune Up had this to say in response:

Yes. You should add Proper Sheathing before applying the new shingles. Install ½” or 7/16” Sheathing Material (Plywood or OSB) over the existing ¼” sheathing. This will provide a good solid deck to nail your new shingles to. If it is nailed properly, it will add tremendous Shear Strength to your building. Thank You for your question. We hope it helps.

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November 5, 2021 at 1:26 p.m.


One last question, could the new 1/2 inch decking be placed on top of the existing shingles or do the old shingles have to be removed first?

November 5, 2021 at 1:27 p.m.


The old shingles have to be removed.


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