How do you get a R38 on the ceiling?

An insulation value of R-38 is at the high end and requires a minimum thickness of 12 inches. R-value does not depend on a single layer of insulation. To achieve R-38, you can use two layers of R-19 or three layers of R-13, which give slightly higher thermal resistance.

How do I make my rafters deeper for insulation?

You can add additional insulation value by installing rigid foam insulation over the surface of the new rafters and batt insulation. Rigid foam insulation comes in 4-by-8 sheets and attaches in a method similar to installing drywall panels.

What can I use to hold insulation up?

There are many options for keeping roof insulation in place, including using metal insulation supports, insulation netting, garden netting, chicken wire, or nylon straps. Metal insulation supports and nylon straps are good affordable options, while chicken wire looks nicer but is more expensive.

Should I put plastic over insulation before drywall?

Without poly beneath the drywall, water vapor hits the drywall and diffuses through to the drier (in summer) indoor air. By installing a sheet of poly there, you cut off that drying mechanism and water that finds its way into walls can stay there longer and do more damage.

How thick is r38 insulation?

The R-38 high-performance batts are 10˝ to 10-1/4˝ thick as opposed to stan- dard R-38 fiber glass insulation batts of 12˝.

Insulation R-38 Ceiling

What type of insulation is best for ceilings?

Spray foam insulation is the most effective type, with a maximum R-value of 6.5 per inch.

Should you insulate attic ceiling?

Should you insulate your attic roof? Insulation is a wise choice to increase the energy efficiency of your home. Quality insulation will make it more cost-effective to heat and cool your home, The Department of Energy's estimates range from a 10% to 50% savings, depending on several factors.

Can I install loft insulation myself?

If your loft is easy to access and has no damp or condensation problems, it should be easy to insulate – and in many cases, it is possible to do it yourself. If access is easy and your loft joists are regular, you can use rolls of mineral wool insulation.

Can you put new insulation over old insulation in the attic?

Yes! You can absolutely new insulation over old insulation… as long as it isn't wet. Energy Star advises as follows: “If it… appears that the insulation [is wet or] has previously been wet, you should look for the cause and repair the problem to prevent a reoccurrence.

Can insulation be thicker than joists?

For the most effective results, insulation that is thicker than the depth of the ceiling joists should consist of two or more layers. The thickness of strips making up the first layer should equal or exceed the width of the ceiling joists.

What insulation should I use between roof rafters?

Normally, people use mineral wool or insulation boards to insulate the rafter space. We prefer recycled insulation for obvious reasons. If you are planning to use wool then it is imperative you wear protective clothing, goggles and a face mask, since the wool is an irritant.

What R-value do I need for ceiling?

Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.

How thick should my ceiling insulation be?

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.

Can you double up insulation?

Doubling the thickness of insulation will double the insulation's R-value, cutting heat loss in half. Each time the insulation layer is doubled in thickness, this rule applies.

How many square feet is a roll of R38 insulation?

Owens Corning R- 38 Attic 64-sq ft Faced Fiberglass Batt Insulation (24-in W x 48-in L) Individual Pack 1 total-Piece. Please check later - it'll be ready for purchase again soon.

What does R38 mean in insulation?

Fiberglass and cellulose insulation are blown in using a pneumatic sprayer, and care must be taken to ensure no compaction occurs. To attain an R-value of R38, a depth or thickness of the blown-in insulation of 15,7″ is needed for fiberglass and 11,98″ for cellulose.

Is a vapor barrier necessary in ceiling?

A vapour barrier is an important component in building construction. Its purpose is to help prevent water vapour from reaching building walls, ceilings, attics, crawlspaces or roofs, where it can condense and cause building materials to rot or grow mould.

Can you put vapor barrier on both sides of insulation?

Avoid installing vapor barriers on both sides of a structure. Walls and ceiling cavities should ideally have the ability to dry out in one direction if the other side is constructed to prevent moisture penetration. Seal all wall cracks and holes in the wall being vapor-proofed to block air gaps.

Can I use Tyvek as a vapor barrier?

No, DuPont^™ Tyvek^® is not a vapor barrier. It is made with unique material science to keep air and bulk water out while allowing moisture vapor inside walls to escape.