Expanded Polystyrene (EPS)
Aged R-Value for EPS = 3.8 per inch EPS SIPs are available in 4′ and 8′ widths with lengths up to 24′. EPS has the lowest cost per R-Value, which means if you are looking for maximum insulation on the lowest budget, EPS is the choice for you. Long Term Stable Materials Make for Long Lasting Buildings Stable Materials like Expanded Polystyrene (EPS) Make for Long Lasting Buildings EPS core SIPs are the only type of SIP that have been third party tested for structural properties. EPS can be ordered in thicknesses up to 25″. EPS is recyclable and does not “out-gas” or loose its insulation value over time by releasing blowing agents.