Attic Subfloor Thickness

You ll need to make sure that the plywood can fit through your attic door.

Attic subfloor thickness.

Attic storage might be a good idea but other issues such as insulation joist spacing and intended usage should be taken into consideration. Viewed 8k times 6. Purchase half inch 1 27 cm thick plywood to act as your flooring. Ask question asked 8 years 9 months ago.

There will be extremely minimal traffic on this floor as i will. Active 8 years 9 months ago. You also need to ensure that the joist spacing is adequate. 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.

Measure the plywood and attic door. The recommended thickness of the plywood subfloor is governed by the spacing of the joists. Attic flooring many new homes around here have trusses 24 on center most of the attic floors are double thickness osb 7 16 when furnaces and water heaters are present. Plywood flooring thickness is important for proper weight distribution.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. I want to install 4x8 sheets of t g plywood in my attic for extra storage room but there are so many different thicknesses. What s the minimum reasonable thickness for subfloor in my attic. The thickness that builders use most often for subfloors is 3 4 inch and when they need extra reinforcement.

Some experts suggest that 15 32 inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less but slightly thicker 3 4 inch plywood should be used for joists spaced further apart. Take the measurements for your subfloor and measure enough plywood so that you can cover the entire frame. Keep in mind that a 4 by 8 sheet of flooring will fit the ceiling joists in either direction. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Attic joists for live loads. Plywood comes in 4 by 8 foot sheets with thicknesses ranging from 1 4 to 1 1 4 inches. Joist dimensions are only part of the equation. It may be easier to lay the sheets cross ways across the joists instead of length wise.

Some have single 7 16 osb spanning 24 where the attic is only for storage.