Roof Insulation Between Under Rafters

This means insulating between or below the sloping beams that form the construction and support a sloping roof.

Roof insulation between under rafters.

Insulating the rafter space will give you a warm loft. Internal restrictions like maintaining sufficient head height can mean that fixing the insulation between and under the rafters is not an option either. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation. 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. Check out our how to video at the link below. Insulation can be installed between the rafters using a ventilated roof construction or an un ventilated roof construction. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect.

Having chosen to insulate your rafters and potentially use the loft space as an extension of your living area you need to be aware of some safety features before you read on. Its versatility is the key to its popularity whether being used to achieve. For rolled insulation place it between roof rafters. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.

If the underlay is a low vapour resistance breathable sarking membrane then a ventilated space is not required. Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss. 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. Common rafter depths range from 100mm to 200mm.

Where the benefits of over rafter insulation want to be enjoyed while still creating a useable room in the roof space it s possible to insulate over and between the rafters. The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom. The decision on which method to use is usually dependent on the sarking or underlay. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

Warm pitched roof to create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters. Place the plastic sheeting on top of the rolled insulation.