How Thick Plywood For Attic Floor?

How thick should plywood be for an attic floor?

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 OSB for attic floor?

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 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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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.

Is it OK to put plywood in the attic?

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. The building code allows for the use of OSB in place of plywood for subflooring.

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.

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.

What type of flooring is best for attics?

Resilient flooring, such as laminate or vinyl, is one of the best choices you can make for attic floors. This type of flooring can soften the sounds when installed over an underlayment.

Is OSB better than plywood?

Wood fiber is used more efficiently in osb. Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood. This is one of the reasons osb is used for webs of wooden I-joists.

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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.

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.

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.

How do I reinforce my attic floor?

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.

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.

How do you know if you can finish your attic?

What to Consider Before Finishing an Attic

  1. Have at least 7 feet of vertical clearance in the majority of the room, be a minimum of 7 feet wide and have at least 70 square feet of space available.
  2. Be accessible by a full-size staircase.
  3. Have another exit in case of an emergency, typically an easily accessible window.

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