Looking at a 2005 tile roof installation manual it looks like the minimum penetration of a roofing nail into roof sheathing was 3 4.
Slate roof mistakes nails too long.
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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.
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This is normal especially on older houses.
On the other hand your roofer screwed up by using too long of a nail on your soffit over hang.
Also nails shouldn t be driven into or above the self sealing strip.
You should use at least four nails per shingle and raise that minimum to six on roofs with steep grades.
Slate roof mistakes cheap plywood roof deck.
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.
Installing ceramic hip tiles on a slate roof slate roofing contractors association 2012 conference.
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.
Any homeowner would be horrified to find out that they need a roof repair but it is still necessary to have it done.
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.
As to the chipping of trusses or decking shearing.
Nail length should be twice the thickness of the slate plus 1 when using a 1 roof deck.
The slating nails should not be too long.
Shingles can slip down if they aren t nailed correctly or if too few nails have been used.
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