Roof Insulation Between Under Rafters

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.

Roof insulation between under rafters.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. Internal restrictions like maintaining sufficient head height can mean that fixing the insulation between and under the rafters is not an option either. This limits the maximum thickness of the insulation between the rafters to between 50mm and 175mm. If the underlay is a low vapour resistance breathable sarking membrane then a ventilated space is not required.

Check out our how to video at the link below. The decision on which method to use is usually dependent on the sarking or underlay. Time to get the insulation finished and get this place warm. Its versatility is the key to its popularity whether being used to achieve.

Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect. 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. Place the plastic sheeting on top of the rolled insulation. The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom.

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. Insulating the rafter space will give you a warm loft. Insulation can be installed between the rafters using a ventilated roof construction or an un ventilated roof construction. For rolled insulation place it between roof rafters.

An efficient room in a roof in a new build property where over rafter insulation is not desirable. Common rafter depths range from 100mm to 200mm. Then feed the rolled insulation under wires and pipe if either is present. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation.

Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss. This means insulating between or below the sloping beams that form the construction and support a sloping roof.