Insulation s r value is a measure of its effectiveness and a single 1 inch sheet of polyurethane foam gives you an r value of 5 5 to 6 5 according to the u s.
Rigid insulation in wall cavity.
It has a thermoset phenolic insulation core sandwiched between two layers of reflective low emissivity composite foil autohesively bonded to the insulation core during manufacture.
Cavityrock is a semi rigid insulation board designed for exterior cavity wall and rainscreen applications.
The correct method of using rigid foam is to run continuous 4 foot by 8 foot sheets of the foam across the concrete basement wall making the rigid foam the de facto wall.
These products offer superior long term thermal efficiency fire resistance moisture control acoustic performance and are compatible with numerous framing systems and cladding attachment systems.
In regard to the range of cavity wall insulation options the mac design guide for taller masonry cavity walls says a foil faced polyisocyanurate insulation is the most beneficial iso is known for its use as roofing insulation but it is also recommended in masonry cavity walls for its thermal moisture and fire performance as well as.