You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
Flooring in attic plywood.
The recommended thickness of the plywood subfloor is governed by the spacing of the joists.
However the same can t be said if you are planning on using the space as a living space.
With all these challenges you might start thinking that attic flooring installation is impossible.
It s possible to create a solid floor without investing a lot of money.
Attic space offers many options for building storage or living space especially if you already have a well built basic flooring in place.
An attic can be floored with 1 2 cdx plywood if it is being used only for storage.
A single 4 pack covers approximately 10 sq.
These lightweight easy to manage panels can be installed by even the most inexperienced homeowner in about 15 minutes.
As an alternative 3 4 osb can be used.
Plywood flooring thickness is important for proper weight distribution.
The previous homeowner may have simply covered the joists with plywood to use the space for storage.
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Attics with existing flooring.
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.
You can for instance use recycled materials.
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.
Don t use 7 16 osb as it is intended for.
Attic storage might be a good idea but other issues such as insulation joist spacing and intended usage should be taken into consideration.
In that case you will need to use 3 4 thick plywood.
Alternatively your attic may already have some sort of floor but this doesn t necessarily mean you can build rooms.
What size plywood for an attic floor.
Here are a few tips to help you and your house get through the attic flooring installation job.
First you ll need to measure the area you want to floor so you can calculate how much wood you ll require.
It isn t but you ll need a dose of common sense to execute the job of installing an attic floor properly.
To floor an attic you ll need to install a sub floor for support before laying your plywood floor.