All nails must be corrosion resistant.
Roofing nails protruding.
A large nail head and heavier shank gauge provide greater holding power.
If you have a friend in the attic ask him to direct you to a sturdy spot where the nail can bite into the wood.
Hammer a new nail into the roof about 1 inch above the hole from the previous nail.
The protruding nails will help hold it in place there are also adhesives for foam that come in std.
3 degree electro galvanized steel roofing nails 5 lb pack for applying roofing asphalt shingles insulation board and felt to wood substrates.
A roofing nail should have a minimum nominal shank diameter of 12 gauge 2 67 mm and a minimum head diameter of 9 5 mm.
Use the grip rite 11 x 1 1 4 in.
Protruding nails can actually be a good thing.
Or there is spray foam insulation to consider if that works with your other insulation and vapor barrier situation.
Of the cutting methods the cut off wheel sounds the best to me.
For example galvanized by various processes aluminium copper or stainless steel.
Roofing nail should have a barbed shank until the head which eliminates nail pops blow offs and roof leaks.
3 use the grip rite 11 x 1 1 4 in.
We just had a new asphalt shingle roof put on and were concerned because hundreds of the roofing nails used to nail down the shingles are protruding through the overhangs of the eaves.
Our contractor said b c our decking was so thin 3 8 the 1 1 4 nails protruded but its ok b c if he used 3 4 shorter nails it would risk.