Polyiso Vs Xps Attic

Extruded polystyrene xps is somewhat lower than polyiso.

Polyiso vs xps attic.

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. Polyiso is a thermoset material meaning it is permanently rigid and cannot be melted back to liquid form. We always choose and recommend eps over xps due to the fact that xps has much higher greenhouse gas emissions than eps.

Some of the key attributes are shown here. Another difference between the polyiso and xps insulation concerns ultraviolet light. 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. Xps is a thermoplastic material which softens or turns to a liquid when heated.

In this video dow chemical rep kevin and i will tell you about the differences between. A thermosoftening plastic or thermoplastic is a polymer that 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. Thermoset materials are generally stronger that thermoplastic due to the network of bonds and are better suited for high temperature applications.

A thermosetting plastic also known as thermoset is a polymer material that irreversibly cures. Xps is classified as a thermoplastic material. Polyiso is compatible with a large number of roof and wall systems too.