How Thick Should Plywood Be For An Attic Floor?

Can you put new plywood over old subfloor?

To add an extra layer of plywood over a subfloor, you will need to clean the floor to ensure there is no dirt and grime.

After cleaning, you will install the plywood over the subfloor one sheet at a time.

However, you need to make sure the plywood seams are over the subfloor so that it provides adequate stability..

How thick should plywood flooring be?

The recommended thickness of the plywood subfloor is governed by the spacing of the joists. 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.

How do I put plywood in my attic?

Carry a piece of plywood to one of the far corners of the attic and lay it on top of the installed boards. The plywood should be perpendicular to the joists so that a signal sheet spans multiple ceiling joists. Cut the plywood to fit so that each end of the plywood boards lands at the exact center of a floor joist.

Can you put insulation on top of attic floor?

A. Without removing the flooring, you have the option of blowing loose-fill insulation (fiberglass or cellulose fiber) over the top of the floor. … Another idea would be to roll out fiberglass batts on top of the floor. Butted tightly together, they would improve the thermal performance of this part of your attic.

What is the best plywood for underlayment?

Poplar or Birch Plywood with a fully sanded face and exterior glue. Lauan Plywood, when used as an underlayment, should be Type 1 (Exterior). The best grade is BB and the next best is CC, while OVL (overlay grade) is the minimum acceptable face grade.

Should I insulate my attic floor or ceiling?

1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space.

Is rolled or blown insulation better?

Rolled fiberglass insulation scores an R-value of 3.7. So overall, rolled fiberglass insulation is slightly more effective at blocking in and out heat than its blown counterpart.

How can I make my plywood floor look good?

Step 1: Apply the Base Coat. Brush or roll a coat of floor-grade primer to seal the grain and prevent bleed-through, wait for it to dry, then apply a coat of floor enamel. … Step 2: Draw Planks. … Step 3: Gouge the Lines and Stain the Floor. … Step 4: Make a Glaze. … Step 5: Paint the Grain. … Step 6: Apply Clear Finish.

What type of plywood should I use for attic floor?

CDX plywoodAn 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.

What is the best flooring for an attic?

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.

Should I put a floor in my attic?

Since an average attic needs 16 inches or more of insulation, the insulation is always thicker than the ceiling joists or trusses. As such, adding a floor can cause the insulation to compress, thus reducing the efficiency of the fiberglass insulation.

How much does it cost to put floor in attic?

Attic Flooring Cost The cost of attic flooring ranges from $3,000 to $16,000, depending on what you already have. The existing floor joists may not support weight, so you’ll probably need most of these services: Price to replace floor joists: $1,000-$10,000. Cost to install subfloor: $500-$800.

Can I turn my attic into a storage place?

It will only lead to condensation. While attics can be turned into makeshift storage units, most of them are not suited for large, heavy objects such as furniture or temperature-sensitive items like electronics or documents.

How much weight can attic joists support?

Attic Joists for Live Loads You also need to ensure that the joist spacing is adequate. In many cases, ceiling joists for dead loads are designed to carry 10 pounds per square foot (psf), as opposed to the 40 or greater psf that live-load joists must carry. Span length is different for every room.

Is it OK to store clothes in the attic?

The best conditions for clothing storage are cool, dark, and dry. Depending on your climate, the attic or garage may not be the best option because of extreme heat. If you’re using a basement, make sure it’s not prone to flooding or excessive moisture.

How do you know if your attic can be converted?

Roof Rafters or Trusses Another factor that determines whether you can convert your attic is the presence of roof rafters vs. roof trusses. Traditional rafters look like triangles; trusses look like triangles with smaller triangles inside of them—the boards forming these small triangles are called chords and webs.

How much weight can you put in attic?

Most trusses are designed for only 10 lbs psf live load for storage, unless they are attic trusses like Drooplug mentioned. You’ve added about 300 lbs already when you put 6 sheets of plywood up there. As Larry said, don’t overdo it.

Can I put plywood in my 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.

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.

What should not be stored in an attic?

7 Things You Should Never Store in Your Basement or AtticDelicate fabrics. … Furniture and décor made from natural materials. … Important papers. … RELATED: The Safe Way to Store Important Papers »Food (unless you store it carefully) … Electronics. … Candles. … Anything flammable (near heat sources)More items…•Nov 24, 2014

Is it safe to put cardboard boxes in the attic?

Cardboard Boxes Those cardboard boxes stacked up in your attic could become a veritable buffet for mice and bugs if you’re not careful. “Pests are attracted to the cardboard and to the glue used in construction of the box,” says Santoro. “Boxes also break down and disintegrate, which will attract pests even more.”