Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch.
Foil faced rigid insulation r values.
When used with iko aquabarrier tm tapes iko enerfoil can act as insulation air barrier and weather resistant barrier all in one.
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.
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.
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.
The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
The foil facing also makes it very easy to seal with good quality foil faced tapes.
Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.
It also is the least expensive.
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.
Ap foil provides exceptional heat moisture and air control and when installed correctly eliminates all major thermal bridges that cause heat loss.
Working with home insulation boards insulation panels typically come in 4x8 foot sheets.
So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.
Eps is the insulation used most widely in insulated concrete forms and structural insulated panels sips.
Products with foil facing help the panels resist moisture vapor.
This type of rigid foam usually comes with a reflective foil facing on both sides so it can also serve as a radiant barrier.
Other materials may only have a fifty percent increase in r value when their thickness is doubled.
One side has a reflective foil facer and the other side has a white non reflective foil facer to suit your building needs.
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.
This material offers the highest r values about r 6 to 6 5.
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.
Highest r value per inch of any rigid board insulation does not melt when exposed to flame versus other types of rigid foam board astm e84 the low permeability of foil facing coupled with polyiso s high thermal performance make it ideal for controlling condensation in walls nominal size ranges from 47 75 to 48 25 by 95 75 to 96 25.
Polyiso provides one of the highest r values per inch of any rigid insulation r 6 0 at 1 inch.
