Insulation Between Rafters And Above Attic

Fit the cut quinn therm qr insulation boards tightly between the rafters.

Insulation between rafters and above attic.

In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. You can use either faced or unfaced batting for this installation. Common rafter depths range from 100mm to 200mm. The will hold open an air gap of approximately 1 inch to allow airflow past a layer of insulation.

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. Isover glass mineral wool gmw is another option for the between rafter insulation as a roll or batt. Insulating between rafters install batting between the roof rafters for finished attic spaces. Roof insulation refers to the practice of installing insulation on the roof slope both above and below the 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. This limits the maximum thickness of the insulation between the rafters to between 50mm and 175mm. You can buy air ducts that staple to the inside of your roof above the eave vents and fit between the rafters. Attic baffles also known as rafter vents go along the sides of your attic and keep your soffit vents from being blocked by insulation.

Measure the space between the rafters where the insulation will be placed and cut the insulation boards marginally. When using insulation that has. 2d extend insulation into joist space to reduce air flows. The ones i ve used are made of styrofoam and iirc they cost around 2.

Cut insulation once you have these in place measure the length of the spaces between your rafters. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Hire a pro to install spray foam insulation. Insulating a pitched roof above and between the rafters.