Attic Plywood Size

Oct 16 2019 what size plywood for an attic floor.

Attic plywood size.

To give yourself enough space to ensure adequate insulation under the flooring construct a riser of 2 x 4 s in the attic over the existing joists. I wanted to add more plywood to the area and wanted to know if any specific type i should use. The decision regarding the thickness of plywood to use for the subfloor in the attic has a lot to do with how you intend to use the attic and it also depends on the spacing of the ceiling joists. In attics built purely for storage purposes you may find 2x6 ceiling joists or in some cases.

The minimum size for an attic s access. These project panels help eliminate waste cut costs and are easier to transport than full size panels. Plywood comes in large sheets. My attic is located above my garage and currently the former owner had random pieces of plywood placed up there.

The most common size for plywood sheets is 4 x 8 feet followed by 5 x 5 feet. It might seem impossible to haul it up to the attic. That s a big size and strength difference between the two types of attic joists even if the joist spacing is the same. Some screwed others not.

These openings not only allow mechanical and electrical contractors to. Install two by four blocking between joists or wherever needed to support edges of the plywood that do not have support from the bottom. The previous homeowner may have simply covered the joists with plywood to use the space for storage. I assume 3 4 inch but there are many types brands to choose from.

If the attic were designed as living space those ceiling joists would become floor joists and be much bigger. Attic access panels serve as an important safety and convenience feature in the home. The decision regarding the thickness of plywood to use for the subfloor in the attic has a lot to do with how you intend to use the attic and it also. While this is not the optimal setup it is acceptable to have ceiling joists covered with plywood or osb to use for light attic storage of dead loads.

Oversizing is an unnecessary expense but you don t want to fall through. Ceiling joists are typically 2 8 lumber floor joists are usually 2 10 or 2x 12 lumber. We also carry pre cut project panels that are available in different sizes that may vary by store. If necessary block around them with plywood or corrugated cardboard to prevent the insulation from piling up on the vent.

Ensuring adequate insulation under the flooring.