What will happen to the EPS foam on the NUDURA® form unit when exposed to UV over time?
When the forms are unloaded on a site, it is always best to leave them in their wrapping until they are stacked on to the wall. When the EPS is exposed to UV, like many other materials it starts to break down at a molecular level. When you have your forms up for a little while, you will notice a chalky dust on the surface of them. This is the EPS breaking down, however the chalky residue left over will slow this down. We, of course recommend cladding your walls as soon as possible, however, if you cannot for some reason, this shrinkage is so low it is practically negligible. • What R Value can I get from a NUDURA® ICF wall? The aggregate R Value of a NUDURA® ICF Wall, with concrete and gypsum board interior finish in place, is 22.4. We state this as a standard value across all thickness of form unit as the thermal resistance of concrete is nearly negligible. The actual R Value would have to be determined from the overall performance of the wall as a system. A performance R Value which
