Screws Per Sheet Of Sub Floor

According to table r602 3 1 of international residential code irc subfloor fastener schedule is as follows.

Screws per sheet of sub floor.

Drive the screws in so that the heads are slightly below the surface of the backerboard sheet. This simple sub floor materials calculator will provide you with the lineal feet of floor joist needed the number of sheaths to cover the floor and how much glue and how many screws it takes to attach the sheathing to the joist. Be sure the joists are dry and free of dirt before applying. Allow a 1 4 inch gap between the edges of he sheets and all surrounding walls.

According to construction and renovation experts some of the best screws for subfloor include the senco 08200y screws the simpson strong tie screws and the hillman group 48248 subfloor screws. The rough or embossed surface of the sheet should face up as applicable. In cases where latex subfloor glue is required careful selection is necessary due to the wide range of performance between brands. Apply glue per manufacturer s specifications.

Man that s a lot of screws. Use a solvent based glue that meets astm d3498 performance standards. Place the first sheet over the mortar bed. 4 feet equals 48 inches which you then divide by 8 to determine that you ll need six nails where the board comes in contact with a truss.

Fasten the sheet with cement board screws using a drill driver making sure the screws are flush with the surface of the sheet or are slightly recessed. Drill screws through the backerboard sheets every 6 to 8 inches. The first two of these come with a nice yellow zinc finish while the hillman group screws are unassuming yet tough in basic black. This means that you ll need to use six nails per each truss that runs under the sheathing because each sheet measures 4 feet wide by 8 feet long.

I ve read for nailing the underlayment to do one nail every foot in the interior of the plywood and around the perimeter at 2. Nail spacing for sheets of osb and plywood is 8 inches per nail. The screw count is a bit high at times but this will allow for losing some. Position the screws at least 1 2 inch but no more than 2 inches from the edge of the sheet.

I ve done a few 4x8 planks with screws at that frequency.