Pitched Roof Sarking Felt

Traditional bitumen sarking felt is the cheapest option for roofing underlay and is readily available.

Pitched roof sarking felt. Very easy installation without breaks. It is fitted under the battens and made from a variety of materials such as felt foil or polystyrene. 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. Windproof in one operation.

Where it is above rigid sarking fully supported be of low vapour resistance i e. Find out about insulating a pitched roof at rafter level and the number of key design considerations which will affect the build up of the roof and the choice of insulation. Be provided to all tiled roofs. Integrated vapour permeable undertile felt provided with a double adhesive strip.

Usually this construction is a ventilated roof which will have sarking felt. Interior finish and volume are retained. A pitched roof is a roof that slopes downwards typically in two parts at an angle from a central ridge but sometimes in one part from one edge to another. 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.

Be uv resistant or of. Less than 0 25mns g where the underlay is highly vapour resistant increased ventilation to the roof space or between the underlay and sarking should be provided as necessary. The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. This brings us to a very important technical issue concerning pitched roof insulation and refers to proper ventilation and breathability of the construction.

Tiled roofs with a pitch of less than 20 degrees and rafters longer than 4 5 meters. The iko enertherm alu nf pro board comes with integrated vapour permeable undertile felt. Very low loading of the roof structure thanks to the light weight. It is slightly different from flat roofing felt as it includes a strong woven base but it can become brittle over time and can rot into the guttering where it has been exposed to sunlight.

Ventilated roofs require a 50 mm air gap above the insulation timber stop battens can be. Pitched roof designing buildings wiki share your construction industry knowledge. In addition to this ventilated cavity a continuous vapour control layer should be positioned to the room side of all of the insulation. When insulating a pitched roof with a sarking felt a minimum 50mm well ventilated cavity is required between the felt and the top of the insulation.