How Many Screws Per Sheet Of Plywood Subfloor

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

How many screws per sheet of plywood subfloor. How many screws needed. Most construction experts use 3 inch steel screws for plywood subfloors. 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. 52 hi all i m putting down a 1 2 plywood underlayment atop my osb subfloor.

Here are nine common subfloor installation mistakes and how to prevent them. I can t find any instruction or installation guidelines that note using screws. 46 screws a sheath 24 o c. I have read on this forum that it is possible to utilize screws but i don t understand why all the direction leave out using screws as an option.

Use 6d common nails spaced 6 apart on edges and 12 apart in the field. If the plywood subfloor you re placing is 5 8 of an inch thick you need a screw about 1 5 8 inches long. Is there an advantage to using nails. 39 screws a sheath floor opening if there is an opening in your floor enter the sq footage in the floor opening field.

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. A 4 8 sheet of plywood is 32 ft 2. You ll want the screw to go about an inch past the plywood into the joist or underlying layer beneath it. 800 32 25 sheets.

I will be using a 3 8 plywood over a 2x6 tg subfloor if it matters. So if your subfloor is 3 4 of an inch thick any screw about 1 3 4 inches long will do the trick. 53 screws a sheath 19 2 o c.