Insulate Between Roof Rafters

This generally would not be a sufficient thickness to achieve the u values required to meet building regulations and more insulation would need to be added.

Insulate between roof rafters.

If your attic is going to be converted into livable space then you will need to insulate the roof rafters. Ceiling insulation refers to any type of insulation installed within the floor nearest to the roof structure of the home. An efficient room in a roof in a new build property where over rafter insulation is not desirable. The benefits of insulating a building around the outside protecting the structure and effectively creating a tea cosy effect are well publicised.

Its versatility is the key to its popularity whether being used to achieve. For rolled insulation place it between roof 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. Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss.

This limits the maximum thickness of the insulation between the rafters to between 50mm and 175mm. Then feed the rolled insulation under wires and pipe if either is present. Common rafter depths range from 100mm to 200mm. Place the plastic sheeting on top of the rolled insulation.