At Snowman Cooler we use extruded polystyrene (XPS) for our freezer and cooler insulation instead of polyurethane insulation. Here’s why
Doesn’t retain water!
XPS insulation and polyurethane insulation were submerged in water for 365 days. XPS ONLY retained 0.3% of the water! In contrast, polyurethane insulation retained over 20%.*
Green and clean!
Our XPS insulation ranks highly for ecological sensitivity. Its stable R-Value, extreme resistance to moisture and corrosion, low flexibility, and compressive strength make XPS an excellent choice for non-toxic, environmentally friendly “green” insulation.
Over a period of 5 years, XPS retained 75% of its original R-Value, while polyurethane only retained 25%.**
The greatest factor in determining how well insulation will hold up in cold storage is how well it holds up to moisture. Although manufacturers who use polyurethane insulation now advertise that their insulation formula is “closed cell,” the process of foaming in place still results in voids forming within the insulation. Moisture and ice tends to form within those voids. This drastically lowers the R-Value of the insulation. The structure of XPS insulation does not create voids, therefore it better resists this build up of moisture, and the R-Value is retained longer. This is why we recommend XPS insulation for your freezer or cooler.
*TEST CONDUCTED AT OWENS CORNING FOR ASTM C 578.
** TESTING CONDUCTED BY THE U.S. ARMY CORPS OF ENGINEERS COLD REGIONS RESEARCH AND ENGINEERING LABORATORY.
Extruded Polystyrene Insulation
For our walk-in coolers and freezers, we use an extruded polystyrene (XPS) insulation with a closed cell structure and high resistance to water. This XPS insulation, which is composed of hydrophobic polystyrene polymers, exceeds the R-Values required by the Energy Independence and Security Act of 2007 and the modified regulations enacted in 2009.
The greatest factor in determining how well insulation will hold up in cold storage is how well it holds up to moisture. Here we compare extruded polystyrene (XPS) and polyurethane to show why XPS is the best insulation for walk-in coolers and freezers.
Regular polyurethane insulation has an open cell structure, which allows moisture to build up in the voids, and this drastically lowers the R-Value of the insulation.
The closed cell structure of XPS insulation better resists this build up of moisture, and therefore it retains its R-Value longer. XPS insulation, both initially and throughout the life of the walk-in, is the best choice for your needs.