Attic Flooring Thickness

Attic joists that are made from 2x8s may be acceptable for building your attic floor but because every room is variable there are no absolutes.

Attic flooring thickness.

Note from this chart that the ideal r value differs for each part of your home. The thinner plywood is acceptable when the joist spacing is 16 inches. Use old boards that are close to the same thickness in a given section of the attic however. Joist dimensions are only part of the equation.

In one scenario this would translate to a bare minimum of 7 x 10. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. More product details close. If you ever need to cover them with finished flooring you can always nail down another subflooring before installing tile or hardwood.

As an example a floor space that totals 70 sq. At least 7 feet in any direction. To prevent homeowners from building strangely configured and potentially dangerous spaces. The thicknesses are as follows.

You don t want lots of different floor heights or walking in the attic will be difficult. A single 4 pack covers approximately 10 sq. 19 32 and 5 8 inch thick. Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.

7 16 15 32 and 1 2 inch thick panels require joists spaced 16 inches on center. Would still not be allowed because its 4 x 17 5 dimensions. You also need to ensure that the joist spacing is adequate. You ll need to make sure that the plywood can fit through your attic door.

If you plan on placing the plywood around the perimeter of the opening or door and using it only to store light boxes or materials 1 2 inch thick plywood should suffice. Attic joists for live loads. Floor space dimensions. Attic flooring panels are easy to install with their interlocking edges.

It s a good idea to rip long thinner strips of plywood that will fit through the attic door. Purchase half inch 1 27 cm thick plywood to act as your flooring. Cdx plywood should be a minimum of 7 16 inch thick. Take the measurements for your subfloor and measure enough plywood so that you can cover the entire frame.