Mono Pitched Roof Ventilation

Divisions of the building product design group.

Mono pitched roof ventilation.

3944123 divisions of the building product design group. The ab20 form part of a passive ventilation system that works year round with no. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. They differ considerably from the conventional gabled roofs in shape and construction.

Through the design and installation of specific product combinations an unimpeded passive ventilation system is created for a skillion mono pitch roof any degree pitch the following product combinations are recommended. A placed on top of the purlins. For mono pitched roofs cross ventilation should be in accordance with bs 5250 and have ventilation equivalent of a continuous high level 5mm slot in addition to eaves ventilation. To reduce moist air entering the roof space.

Whilst it is possible to retrofit passive ventilation solutions to existing buildings it is highly recommended to incorporate passive ventilation during the design phase of any new building project. While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. The vent apron vent is a polypropylene vent which enables warm air to escape from the lower roof void or through the barge detail of a mono pitch skillion roof. Additional continuous 5mm ventilation at high level for roofs where pitch exceeds 35 or for roofs of any pitch with a span of more than 10m for lean to or mono pitch roofs.

Gaps should be sealed where services pass through the ceiling. Eaves soffits and fascias. There are three main types of flat roof construction namely cold deck warm deck and inverted warm deck the only one of which requires ventilation being the cold deck see figures 6 and 7. Has an adhesive and flexible aluminium flashing which is designed to form to roofing profiles and prevent water ingress on any pitch roof.

These ventilation requirements vary based on the circumstances of the building and the interpretation of these requirements by bs 5250. Slating and tiling for pitched roofs and vertical cladding code of practice recommends that roof ventilation be provided in accordance with bs 5250. Achieving calculated continuous and unimpeded airflow through the roof cavity is relatively straight forward.