Foil Faced Rigid Insulation R Values

Johns manville ap foil faced polyiso foam sheathing boards are available in r values up to r 28 and offer a reflective foil facer on one side and a non reflective facer on the other.

Foil faced rigid insulation r values.

Smaller sizes are also available. This material offers the highest r values about r 6 to 6 5. Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch. The foil facing also makes it very easy to seal with good quality foil faced tapes.

Eps is suitable for ground contact and can be treated to resist insects. Johns manville ap foil faced polyiso continuous insulation board consists of a uniform closed cell polyisocyanurate foam core bonded on each side to a foil facer. It also is the least expensive. As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles when it is twice as thick as you can see from the chart above.

Eps is the insulation used most widely in insulated concrete forms and structural insulated panels sips. They re much lighter and easier to work with than plywood sheets. Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness. Highest average r value per dollar about 4 6 r per inch costs the least while meeting or exceeding all required building and energy codes approved for ground contact below grade applications and can be treated to resist insects.

Products with foil facing help the panels resist moisture vapor. Enerfoil is lightweight easy to handle and can be sized with ease and has a high thermal r value r6 2 per inch that provides outstanding insulation protection which helps reduce energy costs. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Polyiso provides one of the highest r values per inch of any rigid insulation r 6 0 at 1 inch.

This type of rigid foam usually comes with a reflective foil facing on both sides so it can also serve as a radiant barrier. 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. When used with iko aquabarrier tm tapes iko enerfoil can act as insulation air barrier and weather resistant barrier all in one. Working with home insulation boards insulation panels typically come in 4x8 foot sheets.

Other materials may only have a fifty percent increase in r value when their thickness is doubled. Ap foil provides exceptional heat moisture and air control and when installed correctly eliminates all major thermal bridges that cause heat loss.