What type of fasteners should be used on the Underlayments?
The fasteners for the underlayment should be: Corrosion Resistant, with a head size to prevent the underlayment to tear through when the roof is loaded only, of a length sufficient to firmly embed into the substrate. Tin tags or capped nails should be corrosion resistant as well. The potential for wind damage to sarking is generally fairly low since the roof is usually either loaded or battened shortly after installation.
