Warm Roof Ventilation Details

Advantages of proper roofing ventilation.

Warm roof ventilation details.

Ventilation is not needed in a warm roof. 25mm at eaves on each slope and 5mm at ridge. The roofs can fail if the roof assembly is not properly installed or insulated or if the outside air is unable to absorb moisture faster than it is accumulated. Ventilation is required for these roofs.

If ridge or eaves ventilation is not possible ventilation tiles can be used at high or low level to achieve the required airflow. Warm roof systems benefit from the insulation sitting above the deck. There are two ways to insulate a roof. A cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.

These roofs do allow a bit of heat to escape from your home through the roof in the winter months. Details both in 2d and 3d to give a clear understanding. A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. You only need ventilation in a cold roof.

No insulation is on top. For a simple duo pitch roof bs 5250 specifies sufficient ventilation as being. This enables the temperature of the structure and the deck to be kept close to the temperature of the inside of the building hence warm. No ventilation is required for these types of roofs.

Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. The installation of roof vents is a crucial part of roof design because it allows for proper attic ventilation which may help prevent condensation and early aging of your roofing materials. These roofs keep your home cooler during the hot summer months. In this way the roof itself is kept cold.

Flat roof details and information relating to insulating a flat roof. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.