Pitched Roof Sarking Insulation

Insulation pitched roof once you understand that 30 of a building s heat is lost via the roof which does nothing at all to help your home s energy level you realise why it makes sense to focus first on the subject of roof insulation.

Pitched roof sarking insulation. Sarking boards are softwood boards generally about 150 mm wide that are attached to the rafters of a pitched roof to give extra strength to the overall structure of a building. Sarking and the building code of australia. They needn t be used in every application and instead their use largely depends on where in the country you are based and what type of construction you are building. In this case we would suggest fitting kooltherm k7 pitched roof board between the rafters and kooltherm k118 insulated plasterboard to the inside face of the rafters.

Taking a fabric first approach to a building s design means focusing on the thermal efficiency of each element and working to achieve low u values using a thickness of insulation that is practical to install. Cold pitched roof. The great advantage compared to insulating from the inside is the uninterrupted insulation shield and the exclusion of thermal bridges. For pitched roofs below 20 degrees with a slate or tile covering the roof build up is the same as for the steeper pitches but all of the joints of the wood fibre sarking boards must be taped or sealed to prevent water penetrating the joints.

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. It is mandatory under the building code of australia bca that all tiled residential roofs regardless of roof pitch with a rafter length greater than 6 metres must be sarked. Csr recommends that all tiled roofs with a pitch of less than 20 are sarked and the bca mandates this requirement for rafter lengths greater than 4 5 metres.

The pitched roof is the most common type of roof construction used in new dwellings today. Usually this construction is a ventilated roof which will have sarking felt. Its versatility is the key to its popularity whether being used to achieve.