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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 38,264
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The reason I said he needed plywood is because of the shear value it provides. All of CA is considered earthquake country and beefing up shear is mandatory when reroofing.
Plus it adds to the way the comp shingles lay down. If you've seen a comp roof directly over wood shingles (or even over another architectural grade comp roof) you've seen a nasty looking roof.
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