Resista polyiso is an economical choice offering protection against fire wind and mold.
Polyiso rigid insulation r value per inch.
The higher the r value the better the thermal performance of the insulation.
Furthermore when properly installed ap foil faced polyiso continuous insulation functions as a water resistive barrier vapor barrier and air barrier eliminating the need to install additional components.
Polyiso provides one of the highest r values per inch of any rigid insulation r 6 0 at 1 inch.
Available values range from 5 6 to 27 3.
This is a measure of insulation s ability to resist heat traveling through it.
In addition to design in service r value nrca recommends designers specify polyisocyanurate insulation by its desired thickness and not lttr or r value to avoid possible.
If you want to determine minimum r value requirements per ashrae 90 1 consider using energywise roof calculator online.
This type of rigid foam usually comes with a reflective foil facing on both sides so it can also serve as a radiant barrier.
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Polyiso consists of a uniform closed cell polyisocyanurate foam core and provides one of the highest r values per inch of any rigid insulation.
When choosing rigid foam insulation you have three main options.
Polyiso offers the highest r value per inch of any rigid foam board insulation.
Let s use the r value of iko s polyiso insulation enerfoil tm as an example.
In nrca s opinion this design in service r value more closely represents conditions in the built environ ment than lttr or tested r value.
Thermal performance is measured using derivative of the r value known as the long term thermal resistance lttr method.
With thicknesses varying from 1 4 5 inches resista polyiso uses firestone s proprietary isogard foam technology to create an impressive insulating value per inch which can translate into significant energy savings.
A key component to polyiso s sustainability is r value.
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.
Lttr is a 15 year time weighted method based on customer s insulation needs.