Polyiso Vs Xps Attic

Polyiso is classified as a thermoset material.

Polyiso vs xps attic.

Xps is classified as a thermoplastic material. Polyiso is a thermoset material meaning it is permanently rigid and cannot be melted back to liquid form. For mineral fiber board r values vary between supplier but are around r 4 0 inch significantly less than for polyiso. So if you are looking for suggestions we would say go for the eps and if you want added protection source one with a foil backing.

Polyiso is compatible with a large number of roof and wall systems too. Some of the key attributes are shown here. Extruded polystyrene xps is somewhat lower than polyiso. Another difference between the polyiso and xps insulation concerns ultraviolet light.

A thermosoftening plastic or thermoplastic is a polymer that softens or turns to a liquid when heated. The difference between polyiso eps xps foam insulation styrofoam. Thermoset materials are generally stronger that thermoplastic due to the network of bonds and are better suited for high temperature applications. Xps is a thermoplastic material which softens or turns to a liquid when heated.

There are a number of factors that are very important to the installer and building owner but are not part of the specifications. I think there are two good choices for exterior rigid foam insulation. Xps is degraded by uv light but the facers on polyiso insulation protect the core from such damage.