Polystyrene Insulation Roof Rafters

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. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. 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.

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Fit 24 rafters or snap in half for 16 or 12 rafter spacing.

Polystyrene insulation roof rafters.

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. 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. An efficient room in a roof in a new build property where over rafter insulation is not desirable.

Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect. The insulation is installed under the roof in the slope. Its versatility is the key to its popularity whether being used to achieve. It provides r values that range from 3 6 to 4 2 per inch.

Some products have reinforced facing to make them sturdier. Feature excellent break resistance and lightweight rigidity for ease of installation. One common use of extruded polystyrene foam board is for foundation insulation panels. Choose this option for areas that need a good amount of strength and water resistance.

This is an even more dense and more expensive foam board insulation. You can use batts polystyrene slabs expanded polystyrene or spray foam to insulate your roof or loft space.

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