When installing shakes and shingles, tile or slate always consider stainless steel or copper fasteners. Nails are available in both hand drive and collated form. Stainless steel roofing screws are designed to secure insulation and single-ply membrane to steel and wood decks. A roofing product that has a 50 year warranty should be installed with a stainless steel fastener that will last equally as long. The chemicals found in treated shakes and the tannic acid in cedar will attack a non-stainless steel fastener.
Copper is very corrosion resistant and soft enough to cut when the slate is being replaced.
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