Heat Flow Out (Winter)

Heat Flow In (Summer)

Cathedral 25 view RT2.5 RT2.9
Ultra 20 view RT2.3 RT2.7
RT - R-values displayed are "total system R-values", as required by the Energy Provisions of the Building Code of Australia.

Calculation is based on the use of the Foilboard® Insulation Panel only. Under no circumstances can this calculation be used in conjunction with any alternative product, as results will vary.