A. Michael Byrne responds: ANSI (American National Standards Institute) specifications require that a corrosion-resistant roofing nail be used when nailing tile backerboard, and that the nail penetrate the wood framing at least.
3/4 inch. While there are no direct references to pneumatic nailing, I see no reason why pneumatic roofing nails couldn’t be used, as long as the fasteners were of sufficient length. It’s important that the nail head does not break the fiberglass matting material imbedded in the backerboard, so make sure to properly set both the gun’s depth...
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