Polystyrene Insulation Roof Rafters

This is an even more dense and more expensive foam board insulation.

Polystyrene insulation roof rafters. One common use of extruded polystyrene foam board is for foundation insulation panels. The insulation is installed under the roof in the slope. It provides r values that range from 3 6 to 4 2 per inch. Choose this option for areas that need a good amount of strength and water resistance.

It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. Its versatility is the key to its popularity whether being used to achieve. Are made of extruded polystyrene foam so they ll stay in place over time and will not rot or deteriorate. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect.

Some products have reinforced facing to make them sturdier. Also called styrofoam insulation this is the least expensive material. 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. You can use batts polystyrene slabs expanded polystyrene or spray foam to insulate your roof or loft space.

Feature excellent break resistance and lightweight rigidity for ease of installation. 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.