Efficiency per inch for 2-lb. closed-cell spray foam
With most things with layers, each layer provides a different level of efficiency which you can then take this and apply cost to find your best number of layers to go. Does anyone know how many inches of 2# closed cell spray foam is the optimum? I talked to one contractor that said that the first 2" of the foam provide 90% efficiency. Does this sound right? Or should you be looking at going 4" or more? How does one determine how much is enough and the rest is overkill?
Posted May 13, 2014 1:41 PM ET
Edited May 13, 2014 2:19 PM ET
Other Questions in Energy efficiency and durability
Does anyone know if there is a manufacturer that makes an energy efficient, dual HVAC/ ventilation system that would satisfy both of my needs and eliminate the need for 2 duct systems?
Are polyisocyanurate materials considered vapor barriers and to be avoided for insulating basements?