Screwing down Sureply 1/4 inch floor underlying with a Montana Flip Counter Sink and Screw Bit.

Fast and efficient way to screw down floor underlay plywood. Using a Montana brand flippable counter sink drill bit and screw driver bit. I use Spax screws and my Milwaukee impact driver. I have replaced old crappy sections with Patriot Timber's SurePly board. 1/4 Inch. This makes a leveled surface on top of the main thicker structural plywood. We will lay engineere
d hardwood for the kitchen here. I use PowerGrab by Loctite with thick applications under the SurePly and also tringular or flat shims to level the new board first. Once happy with levels, I glue down the shims first with the adhesive and fill some spaces between shims with lines of adhesive thicker the shims. Then I lay down board, use my own body to press it down and then start adding screws.

[@joelight20]

Holy hell man. Did you secure all your underlayment that way? That must’ve taken you years. Rent a crown stapler and you’ll be done in no-time. Sureply also states to not use adhesive with their underlayment