Pitched Roof Eaves Ventilation

To comply with approved document c and bs 5250 crossflow ventilation should be provided at both the eaves and or ridge level.

Pitched roof eaves ventilation.

In mixed climates ventilation serves either role depending on the season. This should ensure that effective through ventilation of the whole roof is achieved and assist in pulling moisture laden air out of the building and limiting condensation. Eaves with over fascia ventilation. It is most effective when used in conjunction with high level roof ventilation provided by corovent slate tile and ridge vents.

Slating and tiling for pitched roofs and vertical cladding code of practice recommends that roof ventilation be provided in accordance with bs 5250. Sufficient cold roof ventilation. 0 00 0 bag checkout. A pitched roof which has a single slope and abuts a wall should have ventilation openings at eaves level and at high level.

To provide ventilation opening points can usually be provided on the following areas of a pitched roof. We stock a wide range of pitched roof vents and roof ventilation products from leading brands such as ubbink marley eternit redland. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. Because the roof isn t in play here it doesn t matter how many hips valleys dormers or gables there are.

A key benefit of venting the attic is that the approach is the same regardless of how creative your architect got with the roof. Where the roof pitch is 15 or more ventilation equivalent to a 10mm slot running the full length of the eaves should be provided. Manthorpe g1275 eaves comb filler. If it is through the roof covering it should be placed as high as practicable.

The ventilation at high level may be arranged at the junction of the roof and the wall or through the roof covering. Timloc 3 in 1 eaves ventilation pack 10mm airflow 300mm rafter tray 13 86 ex vat 16 63 inc vat. Eaves soffits and fascias. If a sprocketted or bell cast detail is used then eaves courses should beno lower than the minimum recommended roof pitch.

Eaves ventilation is a simple and effective way of providing the necessary air movement within a cold roof. Duo pitch roofs greater than 20 0 pitch or greater than 10m span should have additional ventilation at the ridge to assist airflow through the roof void equivalent to at least a 3 mm wide continuous gap.