Simple question. I’m installing asphalt shingles over a roof sheathed with OSB. The sheathing has ~1/8″ gaps between sheets. The shingles are nailed along the nailing line, where the shingle is double ply. Inspecting my work from below, I see one row of shingles where most of the nails holding the shingles just happened to land right in a 1/8″ gap between OSB sheets. I know these nails aren’t going to hold the shingles as they’re only going through felt paper. So, what do you guys do when this happens? The manufacturer install details simply state not to nail through the gap, like there’s much of a choice. I might be able to run nails slightly higher or lower, to attempt catching the edge of the OSB while staying on the double ply line of the shingles.. but that seems it will be very tight. Only other option I see is to run additional nails in those shingles, in the single ply area, above the nail line. That, or run a bunch of construction adhesive from below along that 1/8″ gap to try gluing the nails to the OSB.
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Replies
I would make sure that I nailed into a solid surface, adding a few extra nails where necessary. Make sure if you add extra nails that they do not fall with in a couple of inches of the joint between the two singles on the next course of shingles.
The most dangerous time for a roof to have wind damage is when it is freshly installed. Once it has had time for self sealing strips to adhere the shingles together, the shingles behave much like a single large sheet and not a bunch of individual shingles. This will allow other shingles to help carry some of the load from less well nailed shingles.
I have seen roofers who ignore the nail line and put all their nails above the double thickness area of the shingle. They seem to hold up, although I don't want one of their roofs in a hurricane. I wouldn't worry if one row of shingles in a roof was nailed somewhat off spec.
run a bunch of construction adhesive from below along that 1/8" gap to try gluing the nails to the OSB should, if possible at all, only glue down the felt, not the shingles any ways.
Assmuing felt was used.
Just to calm your fears a little bit,
Millions if not billions of three tab single ply shingles have been nailed through a single ply for 60+ years.
mrd,
Add a nail just above the old nail so the head overlaps and holds down the old nail. Might even use a metal simplex or multiple nails.
Those laminated shingles will slide apart in the heat if not nailed correctly. Irritates me no end when I have to go fix them.
KK
You are right to be concerned about this. probably 95% of the shingle wind damage I get to repair is where hacks nailed too high instead of in the headlap where it is supposed to be.
Still tho, that headlap is about 1-1/2" wide and your gap is only 1/8" wide. I'm baffled what you have so many nails in that. I can feel when I nail hits an airhole and move up or down a bit.
Your problem tho now might be being able to get more nails in. If that row is sealed well already, I'd ignore it, as lifting them to add nails could cause more damage than it fixes.