I have a friend with cedar shingles applied directly to plywood sheeting 15 years ago are now lifting/curling due to hail damage. The suggested method of repair for him is to put 1 x 6 strips over the shakes/shingles and then reapply new cedar shingles. Is this the best option? Does anyone have a better solution to this problem? What type of wood is best for shingles? Any insight would be greatly appreciated.
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Why not strip the existing shingles, apply 30# felt to the plywood, and install new shingles over that? To get cutting edge, apply the new shingles over felt AND a rain-screen product.
Part of the problem is that wood shingles should not be laid over a solid (plywood) deck. They need to breathe. And hail may have only exacerbated the problem. You could do ask you ask, but use 1x4 (cheaper), with felt under; or strip as David Meiland suggests.
ciao for niao
To those who know - this may be obvious. To those who don't - I hope I've helped.
...cedar shingles applied directly to plywood sheeting 15 years ago are now lifting/curling due to hail damage
??? I don't see the connection between hail and lifting/curling shingles.
If the shakes are lifting, nail them back down. If there are some that are damaged, replace them. If they're all damaged (or leaking), replace them.
Applying a 2nd layer over them just seems like a way to avoid getting rid of the old shakes. It's not the way to do it.
Finally, cedar is the best material for cedar shakes ;-)
-Don
FWIW... shakes are split, shingles are sawn... at least 'round these parts.