How Many Screws Per Sheet Of Plywood Underlayment

If the plywood subfloor you re placing is 5 8 of an inch thick you need a screw about 1 5 8 inches long.

How many screws per sheet of plywood underlayment.

Nail spacing for sheets of osb and plywood is 8 inches per nail. Most plywood underlayment is about 1 4 inch thick and has square edges and a smooth knot free top face. 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. A 4 8 sheet of plywood is 32 ft 2.

Am i on the right track. 800 32 25 sheets. Drill screws through the backerboard sheets every 6 to 8 inches. 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.

53 screws a sheath 19 2 o c. Types of plywood underlayment. 46 screws a sheath 24 o c. 39 screws a sheath floor opening if there is an opening in your floor enter the sq footage in the floor opening field.

The floor looks like the skin of an airplane with so many screws around the perimeter. 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. So if your subfloor is 3 4 of an inch thick any screw about 1 3 4 inches long will do the trick. For many years the standard option was lauan plywood also called philippine mahogany or luan plywood which is made with an inexpensive tropical hardwood and therein.

I ve done a few 4x8 planks with screws at that frequency. 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. Position the screws at least 1 2 inch but no more than 2 inches from the edge of the sheet. 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.

Man that s a lot of screws.