roof gap

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Old 10-16-13, 08:40 PM
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roof gap

Hi .I am replacing a few rows of shingles w new ones.Should i fill in the large (over 1/2 inch) gap i saw in the plywood where it meets next piece and if so with what.,there is about a 3/4 inch gap ..
Also what size nails for regular 3 tab over plywood with felt?
Any info is appreciated.
 
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Old 10-16-13, 09:06 PM
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There never should have been that big a gap. Got a picture?
1-1/4 galvanized roofing nail.
 
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Old 10-17-13, 09:08 AM
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sorry i dont have a pic ...
also if old roofing had nails in the tar line ,one at each slit..4 nails per shingle, is that a potential problem ?
 
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Old 10-17-13, 05:00 PM
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Not it's not problem as long as there not showing.
 
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Old 10-17-13, 09:04 PM
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The gap in the sheathing is not ideal, but probably not a problem either. Only way it would be a problem is if your nail happened to fall right in that exact spot and you put your hammer through the shingle. Otherwise, the felt underlayment and the shingle will span the gap without any problem.

Regarding the nailing pattern, assuming the installation instructions were followed to the "t", the nails should really be just below the tar line, not "in" the tar line. 4 nails is fine, 6 nails are used in high wind applications.
 
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