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.
Flooring for attic room.
The best flooring for an attic by becky lower the right flooring can make your attic work as hard as the rest of the house.
Lay a plywood base first of 5 8 inch to 3 4 inch thick plywood.
Partial attic flooring.
Air from rooms below will not escape rapidly into the attic.
Thinner plywood can flex when you walk on it even with 16.
If you don t need additional storage think of flooring an area less than the entire attic such as a small section around the attic door opening.
If you plan to finish the floor in the attic and turn the room into a living space however you should always use 3 4 inch plywood.
Attics are a top pick when homeowners decide to gain some extra storage or add a guest room but not all attic flooring structures are up to the task of supporting the weight of a new living space.
In many cases ceiling joists for dead loads are designed to carry 10 pounds per square foot.
First if you never build a room in the attic the insulation in the floor area will save energy costs.
Add a good padding and then lay the carpet.
To avoid overhead noise in the rooms below the attic it might be best to carpet the area.
Before you start creating a floor for your attic you must make sure that it can handle the additional load.
To solve this problem construct a raised platform from 2 4 or 2 6 lumber placed on edge add insulation between the.
If you are just looking for extra storage space consider the minimalist approach of installing flooring in just part of the attic.
You also need to ensure that the joist spacing is adequate.
For example if your attic is accessed through a hatchway or dropdown ladder you can install a few thin plywood panels across the joists or attic trusses within reach of the hatchway.
Also if you do build a room or rooms in the attic one day the floor insulation will help soundproof the attic space.
Joist dimensions are only part of the equation.
Then you ll need to build a grid like structure that can hold up the plywood flooring.