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

Which foam board has the highest R-value?

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-value of 2 inch white STYROFOAM?

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 board?

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 1 inch of closed cell spray foam?

This microscopic difference in the two products creates a dramatic difference in performance. Closed cell spray foam has an R-value of R-7 per inch.

What is the R value of 2 Inches of Spray Foam Insulation?

How thick should Styrofoam 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 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.

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 thinnest insulation with highest R-value?

Thermablok® Aerogel is a revolutionary advancement in thermal technology offering the thinnest insulation available to prevent thermal and cold bridging. Classed as a Super Insulation, Aerogel has the highest insulation value of any known material with the lowest thermal conductivity value of any solid (0.015W/mK).

What is the R-value of packing Styrofoam?

Expanded polystyrene foam (EPS) is the cheapest and least used foam board product on the market. This product typically has an R value of 3.6 to 4.0 per inch of thickness.

What is the thickest foam board insulation?

The thickest foam board insulation goes up to 6 inches thick, but needs to be custom ordered. Standard thicknesses available for most foam board insulation ranges from 1/4-inch to 2 inches, depending on the type. Obviously, the thicker the foam board insulation, the better it will be at insulating your home.

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 effective is styrofoam insulation?

Styrofoam is made mostly of air, meaning it is a poor conductor of heat, but an excellent convector. It traps the air in small pockets, blocking the flow of heat energy. This reduces both conduction and convection and makes Styrofoam a good insulator.

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 R-value of aluminum foil?

Most brands of foil-faced bubble wrap are only 3/8 inch thick or less, and have an R-value of only 1.0 or 1.1.

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).

What is the R-value of wood?

The R-Value of Wood

The R-value for wood ranges between 1.41 per inch (2.54 cm) for most softwoods and 0.71 for most hardwoods.

What is the R-value of spray foam in a 2x4 wall?

Open-cell spray foam absorbs and holds water. It has a lower R-value per inch than closed-cell foam and is vapor-permeable. The R-value is R-3.5 to R-3.6 per inch, so filling a 2×4 cavity yields about an R-13.

What is a better insulator than Styrofoam?

It is called nanowood. It blocks heat at least 10 degrees better than Styrofoam or silica aerogel. Silica aerogel is a common insulator. And nanowood can take at least 30 times more pressure before being crushed.

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.

How many inches of foam insulation do I need?

Now generically speaking, we usually recommend open cell spray foam to be 6- to 10-inches on a roof deck or ceiling and 3-inches in the walls. Closed cell spray foam should be 4- to 5- inches on the ceiling and 2- to 3-inches in the walls.