What type of screws should I use to attach a sign to fiber cement siding?
Just use ordinary wood screws.
Beneath the siding should be 3/8&quot; or 1/2&quot; sheathing. That is what the screws will really bite into.
Just make sure your screws are long enough to go through the sign and siding and have at least 1/2 of length beyond that. If you're concerned about water penetration squirt a little bit of caulk in the hole before placing the screw, but doing nothing is probably fine too