Most protruding 3 or so into the crawlspace.
Roofing nails protruding.
All nails must be corrosion resistant.
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.
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.
Roofing contractors have told me electro galvanized nails that stick out past the sheathing edge can attract water which can prevent the wood deck from absorbing the moisture and rotting.
There is a nifty little lever shovel type thingy that catches on the roofing nails and pulls them back up through the.
A large nail head and heavier shank gauge provide greater holding power.
Protruding nails can actually be a good thing.
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.
For example galvanized by various processes aluminium copper or stainless steel.
Of the cutting methods the cut off wheel sounds the best to me.
Or there is spray foam insulation to consider if that works with your other insulation and vapor barrier situation.
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.
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.