Loft Insulation 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.

Loft insulation between roof rafters.

Common rafter depths range from 100mm to 200mm. Isover glass mineral wool gmw is another option for the between rafter insulation either as a roll or batt. Where the insulation does not fill the total rafter depth the low emissivity foil facings can gain additional thermal benefit from the air spaces they face into. The flexible nature of gmw means that the roll or batts can be accurately cut and friction fitted between the rafters thereby minimising air gaps and maximising thermal performance.

Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect. An efficient room in a roof in a new build property where over rafter insulation is not desirable. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. We used kingspan thermapitch tp10 zero odp.

How do you fix insulation between loft rafters. This means insulating between or below the sloping beams that form the construction and support a sloping roof. You can use rigid insulation board carefully cut to size or you can have foam insulation sprayed between the rafters. Its versatility is the key to its popularity whether being used to achieve.

The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom. Warm loft an alternative way to insulate your loft is to fit the insulation between and over the rafters these are the sloping timbers that make up the roof itself. With a warm roof the usual process is to split the insulation into two layers. Check out our how to video at the link below.

Install the insulation. How to guide measure the space between the rafters before cutting the boards as spacings will vary slightly cut the insulation boards to size using a sharp knife or fin toothed saw. Time to get the insulation finished and get this place warm. Insulating the rafter space will give you a warm loft.