OMG Polymer GypTec fasteners can be installed into some cementitious wood fiber decks without predrilling. A pilot hole is required for gypsum. Use a 7/16-, 1/2- or 9/16-in. drill bit as determined by pullout test results. Pilot holes must be a minimum of 1/2-in. deeper than embedment. Polymer GypTec fasteners should be installed using a heavy duty variable speed screw gun.
Installation at a low rpm is recommended. Minimum fastener embedment into the deck should be 1 1/2 in. (2 in. recommended). The Polymer GypTec fastener should never penetrate the underside of the deck.
Note: Prior to job bid, contact OMG to perform a pullout test to determine drill bit size and the pullout values. Overdriving the fastener can cause damage to the insulation facer.