How thick should my foam board insulation be?

Most panels range between 3/8″ and 2.5″ in thickness, though other dimensions and thicknesses are usually available through custom order.

What is the thickness of rigid insulation?

½ inch to 2 inches

Rigid board insulation generally comes in standard thicknesses ranging from ½ inch to 2 inches. It is possible for homes located in extreme climates to order specialty thicknesses of up to 6 inches directly from certain manufacturers. Obviously, the thicker the rigid board, the higher the insulation capacities.

Which is better rockwool or foam?

Mineral wool insulation is less efficient than insulating foams, particularly at extremely low temperatures. The main reason consists in air tightness. Mineral wool regardless of the installation quality, it does not form air barrier and enables free air passage through its joints.

How thick is r3 8 Rigid insulation?

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. Cellulose is seen as a more sustainable means of insulation, with the recycled paper being used as insulation.

How thick is r10 rigid insulation?


Standard extruded polystyrene requires a thickness of 2″ to achieve an R-10.

What is the R-value of 2 inch foam board?

Foam Board Insulation R-Value per inch

Thickness (in Inches) R-value (in I-P/Imperial) RSI (R-value in Metric)
1.0 6.2 1.08
1.5 9.3 1.62
2.0 12.4 2.16
2.5 15.5 2.7

How thick is r25 rigid insulation?

Extruded polystyrene or XPS (foam is usually pink or blue) XPS has an R-value of 5 per inch of thickness requiring 5″ of insulation to achieve R-25. EPS has an R-value of approximately 4 per inch of thickness, requiring at least 6″ of insulation to achieve R-25.

How thick is r30 rigid insulation?

Typical R-30 fiberglass insulation is 10-inches-thick. Prior to buying fiberglass insulation, it is important to measure the joint spacing you are working with. Note that the actual space between the framing members will be less than 16 or 24 inches, but the foam batts can easily be stuffed between these lengths.

What is the R-value of 2 inch rigid insulation?

R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation

Thickness (Inches) R-value (in I-P/Imperial) RSI (R-value in Metric)
1.5 9.3 1.62
2.0 12.4 2.16
2.5 15.5 2.7
3.0 18.6 3.24

How thick is R60 insulation?

R60 Required Thickness of Insulation Materials

Insulation Material Thickness Required for R60
Fiberglass (Loose-fill) 16-20 inches
Spray foam (Closed-cell) 6-10 inches
Spray foam (Open-cell) 10-14 inches
Cellulose (Loose-fill) 15-20 inches

What is the thickness of R 38 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˝.

How many inches of insulation is R38?

Fiberglass Chart

R-Value Thickness Bags / 1000 Sq Ft
R49 16.25” 22.6
R44 14.75” 20.1
R38 12.75” 16.8
R30 10.25” 13.0

What is the thickness of foam core board?

Foam board comes in three thickness choices: 1/8″, 3/16″ and 1/2″. Gatorboard comes in 3/16″ and 1/2″. Foam board and gatorboard are both indoor materials that look amazing in any indoor setting.

Does foam board insulation need a vapor barrier?

Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.

What is the difference between pink and blue foam board?

Both are manufactured using the same process and contain similar chemical components. The two products also have the same insulating power. However, blue foam boards are manufactured by Dow Chemical Co. whereas the pink foam boards are manufactured by Owens Corning company.

How thick should foam board be on basement walls?

between two to seven inches

The thickness of foam insulation in basement walls will range between two to seven inches, depending on where you live and whether you use open or closed-cell spray foam insulation.

What is the R-value of 4 inch rigid insulation?

R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation

Thickness (Inches) R-value (in I-P/Imperial) RSI (R-value in Metric)
2.5 15.5 2.7
3.0 18.6 3.24
3.5 21.7 3.78
4.0 24.8 4.32

What R-value should basement walls have?

The Model Energy Code recommends R-11 insulating values for basement walls in most of the country and R-15 for the northernmost states.

Which is better EPS or XPS?

In general, when comparing EPS and XPS board densities, the compressive strength of XPS is greater than that of EPS. For EPS to achieve the same compressive strength as XPS, the density of the foam would need to be increased, often resulting in a greater thickness of board being required.

What type of rigid foam insulation should I use?

Choose the right type of rigid foam for your needs

Polyisocyanurate: Known as polyiso for short, polyisocyanurate foam has the highest R-value per inch (R-6.5 to R-6.8) of any rigid insulation. This type of rigid foam usually comes with a reflective foil facing on both sides, so it can also serve as a radiant barrier.

How thick is R11 rigid insulation?

3 1/2 to 5 inches thick

R11 insulation is typically anywhere from 3 1/2 to 5 inches thick, depending on the brand and type of insulation. For example, you can purchase R11 insulation in fiberglass batts and rolls, reflective foam, and rigid boards.

Which foam insulation is best?

Closed cell foam is the best choice for robust insulating where space is an issue, as it can achieve 2x the R-Value of open cell inside a standard wall. Its rigid nature also adds to the structural integrity of the building and E84 fire rated versions are available.

Is 2 inches of closed cell foam enough?

Closed cell spray foam should be 4- to 5- inches on the ceiling and 2- to 3-inches in the walls. This might come as a surprise to you, but honestly, this is all the spray foam it takes to get the biggest bang for your buck with the air seal and thermal resistance needed for certain areas of the home.

Which is better open cell or closed cell foam?

Due to the lighter density of open cell foam, it will perform much better than closed cell when it comes to sound dampening. The thicker, softer material of open cell will reduce sound waves much more efficiently than that of the tight, dense closed cell foam.