Pitched Roof Sarking Felt

Of course sarking adds a significant cost.

Pitched roof sarking felt.

Can i or should i do anything about this. The product can be used as a waterproofing coating on asphalt fibre cement sheeting concrete and bituminous roofing membranes. Iko enertherm alu nf pro. Til r classic undertile felt is a traditional bitumen based slaters felt.

The sarking plus pir l boards are already equipped with an underlay felt on 1 side. Pitched roof insulation with undertile felt iko enertherm is used for the thermal insulation of pitched roofs on the rafters or on the trusses. 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. Til r classic undertile felt is eligible for one warranty for scottish sarking board projects and where it is necessary to provide a safe roosting environment for bats.

The sheeting or sarking felt is laid over the supporting rafters or counter battens and beneath the tile or slate battens. The following insulation board is applicable. It can also be used as a vapour retarder in built up roofing. The roof does not leak at all and there is no signs of there being any moisture coming through but it does trouble me.

Previously it had been standard practice to underline slate or tile roofs with a mortar filling consisting of sand lime mortar and reinforced with animal hair. This brings us to a very important technical issue concerning pitched roof insulation and refers to proper ventilation and breathability of the construction. It acted as a protective barrier to the house before the main roof covering was constructed. Thanks to the self adhesive overlap you create a wind and watertight roof in a single movement.

Roofing felt was introduced in the 1930s. It served two main functions. It also functioned as a secondary barrier to wind driven rain and snow which penetrated under the roof covering as well as potential pests like insects and birds. For further information on how to construct a watertight sub roof download the wienerberger low pitch installation guide here.

Previous article modern roofing at low pitches. Please note that a minimum of 50mm ventilation is required under the sarking felt while a drape space should be left under a breather membrane. Ikopro solvent free water proofer is an easy to use bitumen based emulsion for roofs. The sarking comfort pir l board has on 1 side a wood fibre underlay board of 35 mm.

Next article constructing a low pitch watertight roof part 2.