Plywood necessary on top of old tongue in groove?

Frattman · 12-20-2012, 09:56 AM

I'm in the process of buying a 1953 cape that has very old worn asphalt shingles in need of replacing. From what I can see in the attic, there are no leaks or rot in the tongue in groove planks and it looks in fine shape. Assuming no rot, would it be advisable to still put plywood on top in order to assure that the new shingles nail securely and not potentially on a joint in the tongue in groove? I want to do this right, but like most people, have a budget. I will be doing most of the work myself with guidance from an experienced carpenter friend who suggested the ply - just looking for another opinion.

joecaption · 12-20-2012, 10:06 AM

If it's in good shape, then no there's no need for it.
I've done it when the old sheathing was not T&G and they used wood that was just filled with knots.

Windows on Wash · 12-20-2012, 01:29 PM

+1

T&G is better than plywood for that matter.

If its in good shape, you are good. Just make sure they use the proper length fastener.

12-20-2012, 09:56 AM	#1
Frattman Newbie Join Date: Nov 2012 Location: Connecticut Posts: 26	Plywood necessary on top of old tongue in groove? I'm in the process of buying a 1953 cape that has very old worn asphalt shingles in need of replacing. From what I can see in the attic, there are no leaks or rot in the tongue in groove planks and it looks in fine shape. Assuming no rot, would it be advisable to still put plywood on top in order to assure that the new shingles nail securely and not potentially on a joint in the tongue in groove? I want to do this right, but like most people, have a budget. I will be doing most of the work myself with guidance from an experienced carpenter friend who suggested the ply - just looking for another opinion.

12-20-2012, 10:06 AM	#2
joecaption Member Join Date: Nov 2011 Location: Hartfield VA Posts: 18,838	Plywood necessary on top of old tongue in groove? If it's in good shape, then no there's no need for it. I've done it when the old sheathing was not T&G and they used wood that was just filled with knots.

12-20-2012, 01:29 PM	#3
Windows on Wash Exterior Construction Join Date: Aug 2011 Location: VA, MD, DC Posts: 3,857	Plywood necessary on top of old tongue in groove? +1 T&G is better than plywood for that matter. If its in good shape, you are good. Just make sure they use the proper length fastener. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

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Plywood necessary on top of old tongue in groove?