How Many Screws Per 4x8 Sheet Subfloor

The screw count is a bit high at times but this will allow for losing some.
How many screws per 4x8 sheet subfloor. Cement backerboard is a thin layer of concrete with fiberglass mesh on both sides. According to table r602 3 1 of international residential code irc subfloor fastener schedule is as follows. It s available in sheets of many sizes with 3 foot by 5 foot sheets being the most common. Stagger adjacent rows of panels by two joists.
800 32 25 sheets. For example if the area to be covered in plywood is 800 ft 2 then 25 sheets of plywood will be needed to cover it. That s if the panel is going on a wall. If it s going on a ceiling it ll take about 36 screws.
In standard home construction about 28 screws are needed to properly attach a 4 by 8 foot piece of drywall. A 4 8 sheet of plywood is 32 ft 2. Whether you screw nail or staple your 3 8ths underlayment depends completely upon what flooring product you are planning to put over it. Divide by the total square footage by the square footage of a sheet of plywood to find the number of sheets required to cover the space.
The purpose of an underlayment for vinyl is to have a glass smooth surface to glue to 1 4 ply is the industry standard whereas an underlayment for ceramic tile is to add strength and 3 8ths isn t thick. Use 6d common nails spaced 6 apart on edges and 12 apart in the field.