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Steve Burke 06-30-2012 09:39 AM

fixing knot holes in roof decking
We are reroofing a vintage '60's house here in Northern California. The prior roof (comp shingle) has been removed to reveal 1 x 6 decking (not skip sheathing). Some of the material was soft and has been replaced. The decking and patches are now solid. Still, there are 2-3" knot holes randomly around the roof and would like your opinon if these need to be covered (sheet metal?) or if something else should be done before the felt goes on.

joecaption 06-30-2012 09:46 AM

There is no need to fill them.
It's pretty common to just go over the whole roof with 1/2 OSB or plywood on that old style roof.
It will help the shingles to lay flater, will eliminate loose nails from lifting some shingles, will make the whole roof stronger, and increase the nail holding power.

Steve Burke 06-30-2012 11:06 AM

thanks JoeCaption.
Given that the decking is repaired, we had not intended to cover the decking with OSB or plywood. Not trying to be cheap, just efficient. How do i determine if i need to do this?
Thanks, Steve

Tom Struble 06-30-2012 11:30 AM

they are probably right where a nail needs to go:),most likely the knot fell out after a few years,either replace the bad sections or do as joe says

OldNBroken 06-30-2012 05:17 PM

Geez, what is with everyone insisting you re-sheet everything nowadays?
Must be a lot of LP shareholders here or something.

No need to re-sheet. If it will make you feel better slap a piece of tin over the knot holes. Your roof will not fall off if one nail hits a knot hole.

Tom Struble 06-30-2012 05:28 PM

if it's questionable you either repair it or resheat it,says so in the shingle applicators manual

nailing a piece of tin over it like in the good old days is not in there:(

Roofmaster417 06-30-2012 09:21 PM

An extra 30'-40' of 1x's compared to 40+ or 50+ sheets of CDX/OSB ?? :whistling2:

Replace the decking with the knot holes if needed.Is this home yours ? I have roofed hundreds and hundreds of homes with knots.Ironically enough they are still functioning and the home is still livable.

roofermikeinc 07-03-2012 10:10 PM

Per the Florida Building Code for High Velocity Hurricane Zones, one of the toughest codes on the planet, Miami roofers are permitted to cover holes of that size with 26ga galvanized sheet metal. Smooth shank nails will still back out & that's one reason only ring shank roofing nails are used.

"Roofer Mike"

mae-ling 07-03-2012 10:23 PM

Yeah I'd cut out the section and put a new piece in.
Usually I'd have a sheet of 3/4 ply that I could cut a strip the right width out of.

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