FAQ: What Size Plywood For Attic Floor?

What type of plywood is used for attic storage?

An attic can be floored with 1/2″ CDX plywood, if it is being used only for storage. However, the same can’t be said if you are planning on using the space as a living space. In that case, you will need to use 3/4″ thick plywood. As an alternative, 3/4” OSB can be used.

How thick should plywood be for attic storage?

Joist Spacing and Attic Use You need 3/4-inch plywood. The thinner plywood is acceptable when the joist spacing is 16 inches. 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.

How thick should plywood be to walk on?

Sizing the Plywood No matter what the spacing is on your ceiling joists, 3/4-inch plywood should be used if you plan on walking on it. 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.

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What size should attic floor joists be?

The rule of thumb for joist measurement is half the span plus 2″ measured in feet. Therefore a 10 foot span would require a 7×2 joist, a 12 foot span an 8×2 joist etc. The 3.5m span is approx 11′ 6″ therefore would require an 8×2 joist to be on the safe side.

Can I cover my attic insulation with plywood?

Once the insulation is down, you can turn your attic into valuable storage space by covering the floor with plywood. It will also make the attic a safer place in which to walk.

Is it OK to put plywood in the attic?

If your attic joists won’t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage, you can install ½-inch plywood or oriented strand board (OSB) in 4-foot-by-8-foot panels over existing 16-inch OC joists.

How much does it cost to put plywood in attic?

A contractor will charge $550, which includes labor and material, to lay a plywood floor in an area approximately 10-feet square. If you have basic carpentry skills and tools, you can do the job for $190, the cost of the plywood and screws.

Is my attic strong enough for storage?

As long as they are not damaged, the joists should be strong enough to allow you to move around in the attic for an inspection and to provide storage for typical boxed items. The joists should support your weight, but the space between them almost certainly will not.

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Can my attic support a floor?

That begs the question; can my attic support a floor? The answer, in most cases, is a definite yes. Even though it wasn’t put there, the joists supporting your ceiling are quite strong. Putting down flooring won’t stress them any more than the floors in your bedroom, kitchen, or bath.

How much weight will 3/4 plywood support?

A 12-by-36-inch piece of 3/4-inch fir plywood can easily support 50 pounds.

How much weight can a plywood floor support?

As plywood is often used as a load bearer, you may be concerned about how much of a load plywood can bear. Marine plywood and MDF can sustain several hundred pounds per sheet, whereas cheaper types of plywood can typically bear anywhere between 5 and 50 pounds per sheet.

What is the strongest type of plywood?

If you ever wondered “what is the strongest plywood?” The answer is Marine plywood. It is the strongest and toughest of all plywood on the market. It is bonded with high-quality glues to make the plies structurally solid and resistant to moisture.

Can you use MDF for attic floor?

Hellrazor is right, MDF is not rated for flooring. But in addition to plywood you can also consider OSB- same strength as plywood and is likely a little cheaper.

How do you strengthen attic floor joists?

If the attic joists are not adequate, one way to strengthen the floor for live loads is to sister the old joists. Sistering is the process of adding a new joist next to each existing joist. In the case of 2 x 6 joists, you can pair them up with additional 2 x 6 joists by nailing them together, side by side.

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How thick should my floor joists be?

Joists in home construction are usually made with 2-by-10 or 2-by-12 lumber, which are 9 1/4 and 11 1/4 inches deep, respectively. Put it all together, and you’re in the range of about 12 to 14 inches.

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