Polystyrene Insulation Roof Rafters

It provides r values that range from 3 6 to 4 2 per inch.

Polystyrene insulation roof rafters.

You can use batts polystyrene slabs expanded polystyrene or spray foam to insulate your roof or loft space. Its versatility is the key to its popularity whether being used to achieve. Fit 24 rafters or snap in half for 16 or 12 rafter spacing. The insulation is installed under the roof in the slope.

You should leave the space under the roof tiles free from insulation to give adequate ventilation so that you don t get condensation or water coming through the tiles. 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. Feature excellent break resistance and lightweight rigidity for ease of installation. 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. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat.

Choose this option for areas that need a good amount of strength and water resistance. Are made of extruded polystyrene foam so they ll stay in place over time and will not rot or deteriorate.