Nail length should be twice the thickness of the slate plus 1 when using a 1 roof deck.
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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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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.
This is normal especially on older houses.
If you wait too long before getting a slate roof repair you could be setting it up for more problems in the long run and it will be both expensive and time consuming.
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.
Also nails shouldn t be driven into or above the self sealing strip.
Shingles can slip down if they aren t nailed correctly or if too few nails have been used.
Any homeowner would be horrified to find out that they need a roof repair but it is still necessary to have it done.
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You should use at least four nails per shingle and raise that minimum to six on roofs with steep grades.
As to the chipping of trusses or decking shearing.
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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.
The slating nails should not be too long.