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Question DetailsAsked on 12/31/2014

Termites are eating sections of my roof. I need new plywood, tar paper and shingles and sealants. Cost for 1800 sq

I have a cathedral ceiling in my second story house. There is a layer of plywood over those cathedral boards, a layer of tar paper over the plywood and a layer of composite shingles over the plywood. How much would it cost to install new plywood, tar paper and shingles. Also, to add termicide to the plywood and ceiling boards.

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You can find a lot of former similar questions, with responses, in the Home > Roofing link in Browse Projects, at lower left. The added cost of replacing the sheathing (plywood) is included in some of them.

One thing you need to consider, and there are a number of prior discussions in the same link about this, is ventilation and insulation issues in the presumed airgap (rafter-thick) between your cathedral ceiling architectural boards (probably tongue and groove) and the roof sheathing - because if incorrectly handled, you can get some really nasty moisture issues up there, which might well be why your plywood needs replacement. In general, excepting some drier areas of the country where winged dry termites infest roofs, a very large percentage of attic/roof infestation are because there was damp wood there first to attract them - so you need to determine the CAUSE of the infestation and whether moisture buildup in the rafter bays (spaces between rafters) was the cause of the problem in the first place.

It is quite possible that there was no vapor barrier placed between the rafters and the architectural "ceiling" - or if the rafters are exposed with the "ceiling" boards aligning with them and between them, between them and the roof sheathing. If this is the case, then household moisture could well be destroying the sheathing, and will do so again unless remedied. Also - if the latter is the case, your cathedral ceiling boards are nailed to the roof sheathing, so to reroof with sheathing replacement, you either have to remove all the ceiling boards first for reuse, or remove them all together and plan on replacing a lot of them - if not all - significantly increased removal and disposal cost, as well as the cost of replacing the ceiling boards.

Answered 5 years ago by LCD

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