These materials have a typical R-value of about R-5 to R-6 per inch, though when installed with a radiant surface (that might help) and a 3/4" air gap, the R-value is increased substantially - as we detail below. Fiberglass batts, which are still most-widely used in residential con...
On the other hand, despite having the same density, EPS (845 m2/m2) and the wood batt insulations demonstrated the biggest differences of smoke production, with a 32 times higher value for the expanded polystyrene. Ostman [21] noted that during combustion, wood releases smoke at a quantity ...