Use 6d common nails spaced 6 apart on edges and 12 apart in the field.
Screws per sheet of sub floor.
Allow a 1 4 inch gap between the edges of he sheets and all surrounding walls.
Drive the screws in so that the heads are slightly below the surface of the backerboard sheet.
I ve done a few 4x8 planks with screws at that frequency.
Drill screws through the backerboard sheets every 6 to 8 inches.
Apply glue per manufacturer s specifications.
Nail spacing for sheets of osb and plywood is 8 inches per nail.
In cases where latex subfloor glue is required careful selection is necessary due to the wide range of performance between brands.
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.
Place the first sheet over the mortar bed.
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.
Be sure the joists are dry and free of dirt before applying.
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.
The rough or embossed surface of the sheet should face up as applicable.
The first two of these come with a nice yellow zinc finish while the hillman group screws are unassuming yet tough in basic black.
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.
Use a solvent based glue that meets astm d3498 performance standards.
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.
The screw count is a bit high at times but this will allow for losing some.
Am i on the right track.
The floor looks like the skin of an airplane with so many screws around the perimeter.
Position the screws at least 1 2 inch but no more than 2 inches from the edge of the sheet.
