Insulating Existing Pitched Roof

How to install pitched roof insulation beneath and between the rafters insulation can be installed between the rafters using a ventilated roof construction or an un ventilated roof construction.

Insulating existing pitched roof.

When installing roof insulation on an existing pitched roof the thickness of the material is often a key concern. If you do have existing roof insulation the first thing to do is to check the depth. Before fitting any insulation to the sides of a pitched roof space any repairs to the roof should be completed once the insulation is in place it will be harder to spot any leaks inside the roof and any leaks will soak the insulation itself. Saint gobain insulation uk manufacture and supply glass mineral wool slabs and rolls along with rigid polyisocyanurate pir boards that can be considered suitable for a wide range of applications across pitched roofs whether you re looking to insulate at joist level or at rafter level in your pitched roof construction.

When insulating pitched roofs with old style felt it is important to maintain a minimum 50mm well ventilated cavity between the felt and the top of the insulation. This multi purpose material is mixed with water and blown directly onto the designated surface using highly specialist equipment. How to insulate a pitched roof at rafter level a warm roof is where it is above and between the rafters so the rafters are kept warm. On new build or replacement pitched roofs the ideal build up would be insulation fitted over and then between the rafters giving a big boost for airtightness image credit.

This video shows you how to use knauf insulation rock mineral wool rmw for sarking insulation installed above rafters and covered with homeseal lds weather. The best way to insulate a pitched roof is to install the very latest insulation technology which comes in the form of spray foam insulation. The decision on which method to use is usually dependent on the sarking or underlay. A cold roof is where the insulation is between and below the rafters and the rafters remain cold.

Insulation fitted below the rafters can cut into headroom within the attic space whilst installing above them will raise the roofline requiring changes to the verges and eaves.