Overly long nails used to fasten field slates may blow out the underside of the roof sheathing at each fastener penetration diminishing the holding power of the nail.
Slate roof mistakes nails too long.
So if i assume 1 2 osb sheathing i should be able to cut the nails off with 1 4 still sticking through the sheathing into the attic.
On the other hand your roofer screwed up by using too long of a nail on your soffit over hang.
Shingles can slip down if they aren t nailed correctly or if too few nails have been used.
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Also nails shouldn t be driven into or above the self sealing strip.
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Nail length should be twice the thickness of the slate plus 1 when using a 1 roof deck.
As to the chipping of trusses or decking shearing.
Hip and ridge cap slates are the most vulnerable to wind damage especially on the windward side of the home and at the eaves and corners.
You should use at least four nails per shingle and raise that minimum to six on roofs with steep grades.
Looking at a 2005 tile roof installation manual it looks like the minimum penetration of a roofing nail into roof sheathing was 3 4.
Any homeowner would be horrified to find out that they need a roof repair but it is still necessary to have it done.
Slate roof mistakes nails too long.
Here you can find instructions for installing a slate roof repairing and restoring slate roofs and repairing asbestos roofs and ceramic tile roofs.
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If a 1 1 4 roofing nail catches the edge of the sheathing it may also catch the edge of a truss and crack or chip either one.
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