Pitched Roof Sarking Felt

The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness.

Pitched roof sarking felt. Types of roofing felt. 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. Integrated vapour permeable undertile felt provided with a double adhesive strip. Very low loading of the roof structure thanks to the light weight.

In addition to this ventilated cavity a continuous vapour control layer should be positioned to the room side of all of the insulation. Windproof in one operation. 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. Be uv resistant or of.

Pitched roof designing buildings wiki share your construction industry knowledge. Traditional bitumen sarking felt is the cheapest option for roofing underlay and is readily available. Ventilated roofs require a 50 mm air gap above the insulation timber stop battens can be. 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.

Roof sarking is an thin insulating membrane that helps protect the roof space from water and dust. Where it is above rigid sarking fully supported be of low vapour resistance i e. 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. 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.

It is fitted under the battens and made from a variety of materials such as felt foil or polystyrene. The iko enertherm alu nf pro board comes with integrated vapour permeable undertile felt. Interior finish and volume are retained. 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.

Tiled roofs with a pitch of less than 20 degrees and rafters longer than 4 5 meters. Very easy installation without breaks. 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. Be provided to all tiled roofs.