Question: Can You Put Plywood Over Blown Insulation?

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..

Can attic joists support a floor?

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. … 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.

Can you put plywood on top of blown in insulation?

While you can construct dams around recessed lights that aren’t IC-rated to keep insulation away from them, you can’t cover them with plywood. … Don’t install a moisture barrier on top of the insulation. It will cause moisture to condense in the insulation, and the insulation may clump or mold may grow.

Can you walk on blown insulation?

The insulation is 12-15″ deep. There is no walkway or landing in the attic. … Unless you can safely traverse the attic in the truss webbing or on boards suitable to crawl/walk on, its best to stay out. If you find blown in cellulose and can’t see all areas, say so and move on.

Is my attic strong enough for storage?

Floor Framing 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.

Is blown in insulation messy?

Blowing in insulation is a messy prospect and you’ll need to wear a dust mask, protective eyewear, gloves, and old clothing that you can toss out when you’re done. Never stand on joists. If you stand on joists in the attic and lose your balance, your foot will go right through the drywall ceiling below.

Can you put plastic over insulation in attic?

Once you talked about stapling down sheets of plastic over rolls of insulation. … In any case, a vapor barrier always faces the heated side, so it would never be put on top of batt insulation in an attic.

Can you put plywood over attic insulation?

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 thick should Plywood be to walk on?

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.

What is the cheapest type of plywood?

D-grade plywood: The cheapest type of plywood veneers, these sheets typically haven’t been repaired. The flaws can be slightly larger and the knots in this type of plywood can be up to 2.5 inches in diameter. CDX: CDX-grade plywood is typically inexpensive material, as it is made of the two lowest grades (C and D).

Can you lay loft boards directly onto joists?

The supports just need to be attached to ceiling joists or roof trusses, spaced around 1m apart, and then the loft boards can be installed directly onto the supports. This results in a secure raised loft floor that allows the insulation to work effectively.

Is it OK to put flooring over blown in insulation?

Place flooring over insulation to make your attic space functional. Attics are generally covered in batting or blown insulation. If blown-in insulation is used, control the height or thickness of the layers so boards can by laid over top without having to compact the filler.

Can you compress attic insulation?

When you compress fiber glass batt insulation, the R-value per inch goes up, but the overall R-value goes down because you have less inches or thickness of insulation. So, you don’t get the full R-value on the label, but the insulation still works perfectly well if all you’ve done is compress it.

How much blown insulation should be in the attic?

R-Value is a measure of insulation’s ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.

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. … Food (unless you store it carefully) … Electronics. … Candles. … Anything flammable (near heat sources)

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.