What is the R-value of 4 inch Styrofoam?

5.0 per inch
Resistance to the flow of heat is measured in “R-value”, the higher the R-value, the harder it is for heat to get through. STYROFOAM extruded polystyrene insulation is rated at an R-value of 5.0 per inch at 75°F.

What is Type 4 insulation?

Kingspan GreenGuard™ Type 4 XPS Insulation Board comprises closed–cell extruded polystyrene (XPS) with a minimum compressive strength of 60 psi. It has high water resistance and R–value of 5.0 per inch of thickness. It is available in a square edge board or a drainage channel board.

What sizes do insulation boards come in?

Three types of PIR Insulation Boards available in different thicknesses, 12mm-45mm, 50mm-100mm and 110-150mm, all especially designed to eliminate thermal bridges, very easy to cut and shape and energy-efficient.

What is XPS type 4?

GreenGuard Type 4 XPS Insulation Board is an ideal exterior insulation, meeting your needs for multiple applications. Its extruded polystyrene (XPS) construction provides superior moisture resistance. And since it does not absorb moisture, it retains its insulating properties over time.

Which is better EPS or XPS?

XPS, at about R-5 per 25 mm, has only a slightly better thermal performance than EPS. However, EPS with the same level of density is less expensive. XPS is usually avoided in areas where materials with less density are needed or where the material, which is not produced below a certain density, is not applicable.

Why are insulation boards so expensive?

PIR insulation materials’ peak in demand resulted in its shortage in the market due to the insufficient supply of MDI chemicals. Consequently, PIR boards’ prices started to rise and continue to witness new heights with no signs of stopping.

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

Blown-in fiberglass has an R-value of 2.2 to 2.7 per inch. Batts. Fiberglass batts and rolls are ideal for placement between framing during construction in floors, walls, attics, and ceilings. They’re denser than blown-in insulation, offering an R-value of up to 4.3 per inch.

Does rigid foam insulation need to be covered?

A: Yes, but to comply with building codes, all foam plastics must be covered with a 15 minute thermal barrier. Gypsum board, ½” thick is a common covering.