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Question DetailsAsked on 1/23/2016

I have plank sheating on roof. The house is 1728 sq. feet. How much to have 3/8 inch plywood and asphalt shingles

Was told that could not have shingles put on plank with out plywood. can plywood go over planks?

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1 Answer


They are pretty much right on the shingles going over boards - unless full edge contact boards like tongue and groove or tight-fit wood sheathing, without the usual 1/2-2" gap between boards, a lot of nails/staples would miss and you would have some loose shingles.

If intact, unrotted, and the boards are ALL laying flat theoretically you could put the plywood sheathing over them using longer fasteners to catch the rafters/truss upper chord - I would NOT trust fasteners just catching the existing boards, and all edges should be fully fastened over wood so that means adding some strips as filler where sheet edges fall - a hassle and time consuming.

Personally, to get the most even looking roof possible and the highest quality job, and to avoid the possibility of manufacturter or installer coming back during a warranty claim and saying the underlying boards are the cause of any defect, I would pay the extra probably $-.50-1.00/SF and have the boards ripped of down to the framing, so the plywood can be properly fastened directly to it. The removed boards might give you a nice batch of firewood if you are not adverse to some evenings doing nail pulling from the planks and don't have little kids running around that could get hurt on the protruding nails until they are pulled.

Course, I would not use 3/8" sheathing either unless you have 12" rafter spacing - in most areas nominal 1/2" is minimum by code (actually usually 15/32" or 12mm) for standard 24" rafter spacing, and in heavy windstorm/tornado/hurricane country I recommend 3/4" CDX plywood. And of course, as long as I am giving out gratituous advice, I recommend you use exterior rated plywood not OSB or particle board - in my opinion that is suitable only for emergency window and door covering after a disaster or fire, not as a building material. I can't count the number of homes with deteriorated pressed board materials like that which I have seen (in cold, wet, and also hot humid environments) which caused unnecessary reconstruction or major replacements to remove the rotting or falling apart pressed wood product.

Answered 4 years ago by LCD

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