Polystyrene Insulation Roof Rafters

You can use batts polystyrene slabs expanded polystyrene or spray foam to insulate your roof or loft space.

Polystyrene insulation roof rafters.

It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. Some products have reinforced facing to make them sturdier. It provides r values that range from 3 6 to 4 2 per inch. Fit 24 rafters or snap in half for 16 or 12 rafter spacing.

Feature excellent break resistance and lightweight rigidity for ease of installation. Choose this option for areas that need a good amount of strength and water resistance. One common use of extruded polystyrene foam board is for foundation insulation panels. In this blog post we will be looking at insulating pitched roofs and why putting insulation just between the rafters isn t a viable solution.

The insulation is installed under the roof in the slope. This is an even more dense and more expensive foam board insulation. Are made of extruded polystyrene foam so they ll stay in place over time and will not rot or deteriorate. Also called styrofoam insulation this is the least expensive material.

An efficient room in a roof in a new build property where over rafter insulation is not desirable. The general advice we give is that you should always insulate between and above the rafters or between and under the rafters on our u value calculator we don t give an option for putting insulation between the rafters.