Warm Roof Eaves Ventilation

Roof voids must be ventilated in order to stop warm air condensing on cold surfaces.

Warm roof eaves ventilation.

Warm deck the insulation is placed over the rafters and then a felt is placed on top. Klober circular soffit vents provide eaves ventilation through the soffit and are a particularly easy option to install. Cold deck flat roof construction is more prone to defects and it has a shorter lifespan. A vapour membrane should be added to the underside of the insulation and tacked to the joists before applying the plasterboard.

Home roof ventilation eaves ventilation warm roof rafter tray x 400mm harcon rt41. 25mm at eaves on each slope and 5mm at ridge. Ventilation must also be provided through the eaves or roof ridges using fascia vents or the skylight upstand on the roof. If ridge or eaves ventilation is not possible ventilation tiles can be used at high or low level to achieve the required airflow.

They also come in four colour options. Eaves ventilation is a simple and effective way of providing the necessary air movement within a cold roof. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Condensation encourages rot and mould growth.

For a simple duo pitch roof bs 5250 specifies sufficient ventilation as being. It is most effective when used in conjunction with high level roof ventilation provided by corovent slate tile and ridge vents. Eaves and ridge ventilation is not normally required. These are some of the reasons why a cold roof can be cheaper as ridged warm roof insulation tends to be more expensive a warm roof is sometimes the only option when it is difficult to get the required cross ventilation.

Slating and tiling for pitched roofs and vertical cladding code of practice recommends that roof ventilation be provided in accordance with bs 5250. Hot air exhaust vents located at the peak of the roof allow hot air to escape. The air gap dimensions shown on the drawings are the minimum widths required for clear continuous ventilation air paths at the eaves. Klober flat roof vents.

Ventilation at the eaves. Eaves soffits and fascias. Warm roof ventilation specification. Quantity discount inc vat 1 49.

Sometimes we get asked why choose a cold roof or warm roof. This is to be provided by an unobstructed 50mm air gap between the roof deck and insulation. To provide ventilation opening points can usually be provided on the following areas of a pitched roof. Ventilation is also required at eaves level to a degree which equates to a 25mm continuous strip see figure 7.

Rt41 0 82 inc vat 0 98 corovent 400mm single rafter tray provides 25mm air gap per lm for warm roofs or pitches below 15 degrees rt41.