What R-value is foam board?

Foam board insulation R-value varies based on type but is anywhere from 3.6 per inch of insulation thickness to 8.0. The types of foam board insulation include polyurethane, polyisocyanurate, extruded polystyrene foam, and expanded polystyrene foam.

What is the highest R-value foam board?

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.

What is the R factor of 2 inch foam board?

With an R-value of 13.1 for a 2" thick sheet only two 2" sheets are required to achieve R-25. 2. 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.

What is the R-value of rigid foam insulation?

Rigid foam R-values range from R-1 for 1/4-inch thick sheathing panels to R-15 for 3-inch thick panels. R-value is not entirely a function of the thickness of the material, as the facing material and type of foam used will affect the R-value of the material.

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

STYROFOAM extruded polystyrene insulation is rated at an R-value of 5.0 per inch at 75°F.

Why R-value is Important for Foam Board Insulation

Does foam board insulation lose its R-value?

Insulation R-value is directly correlated to maximum energy efficiency in a building envelope; higher R-values translate into increased savings. In below grade applications, foam insulation is exposed to moisture and could lose R-value over time if this moisture is absorbed.

Is foam board good for insulation?

Foam board insulation is a great alternative to the very common fiberglass batt insulation that is in most of our homes. It has a higher R-Value per inch of thickness, it's resistant to moisture and is easy to work with.

What is the R-value of 2 inch blue Styrofoam?

A wall utilizing STYROFOAM T-MASS Technology with a 2-inch exterior layer and a 4-inch interior layer of concrete along with a 2-inch layer of STYROFOAM extruded polystyrene insulation would result in a material R-value of approximately 11.33.

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.

What R-value can you get in a 2x4 wall?

Fiberglass and rock wool batts—2x4 walls can hold R-13 or R-15 batts; 2x6 walls can have R-19 or R-21 products. Generally, batt insulation is the least expensive wall insulation material but requires careful installation for effective performance (see page 4).

How thick is R30 insulation?

8¼ ” thick, R-30C EcoTouch® Thermal Batt insulation prevents moisture damage and helps assure long roof life by providing 1" of ventilation air space between the insulation and roof deck. Easy Installation R-30C EcoTouch® Thermal Batt insulation is easy to handle and install.

What is the R-value of 2 inches of closed-cell foam?

R-Value In 2 Inches Of Spray Foam

The R-value ranges from R-3.5 to R-3.6 per inch. The filling of a 2×4 cavity yields about an R-13.

What insulation has the highest R-value per inch?

Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.

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 a good R-value for a pole barn?

R30 and R19 are recommended for the walls and roof. Condensation blankets provide minimal R-value and prevent indoor condensation. Double bubble radiant barrier insulation and 2-inch vinyl-backed post frame insulation are used.

Can you insulate an attic with foam board?

You can use foam board in the attic. It is an excellent installation option for the attic because it is lightweight, easy to work with, and offers high R-values. Often the R-value of fiberglass insulation is too low and requires the rafters to be retrofitted, making foam board a better choice.

What is better foam or fiberglass insulation?

Spray foam insulation fills all spaces, preventing air from escaping. It acts as an air barrier. Like cellulose insulation, spray foam insulation is significantly more efficient than fiberglass and has a higher R-value.

How thick is R25 rigid insulation?

Develop a 2-inch thick composite foam insulation board with R25 (hr-ft2-F/Btu), with a cost premium of $0.30/ft2. This addresses the MYPP goal of creating low-cost, advanced insulation materials.

What is a good R-value?

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.

Does rigid foam insulation need to be covered?

Tests have shown that these laminated boards can withstand UV ray damage for a reasonably long time. That said, it's still advisable to cover any foam board insulation exposed to the Sun within 30-60 days at the most. On most projects, that's more than enough time to finish the exterior walls.

What is the R-value of 3/4 inch STYROFOAM?

STYROFOAM extruded polystyrene insulation is rated at an R-value of 5.0 per inch at 75°F.

What is the R-value of 1 1 2 rigid insulation?

x 4 ft. x 8 ft. R-5.78 Rigid Foam Insulation.

What is the R-value of Dow blue board?

DuPont™ STYROFOAM™ Scoreboard Insulation Board (Blue Board) 4 ft by 8 ft Sheet, 1" Thick, R value 5.0 A nonstructural, rigid board insulation manufactured of Extruded Polystyrene Foam (XPS).