IKO agrees with and supports the ARMA position that nails are the preferred method of fastening asphalt roof shingles due to their superior holding strength. The following fastening tips apply to most IKO shingles; (check specific product application instructions for further information):
A minimum of four fasteners per shingle are used.
Correctly place and position fasteners below the sealant strip, but above the cut-out on three tab shingles, and in the nail line on laminated shingles.
The fasteners must be straight and flush with the surface of the shingle, not sunk into the shingle or sticking up at any point.
Make sure there is correct penetration of the deck as specified by ARMA and the NRCA.