Warm Deck Flat Roof Eaves Detail

25mm at eaves on each slope and 5mm at ridge.

Warm deck flat roof eaves detail.

The sandwich warm deck roof is the most common type of flat roof. If ridge or eaves ventilation is not possible ventilation tiles can be used at high or low level to achieve the required airflow. The insulation is tapered to provide a fall to the roof to enable water to run to the water outlets. 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.

A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building. The eaves detail shows where the roof members and coverings meet the wall of the dwelling. The vapour control layer is above the decking but below the insulation. Warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.

This is usually the most satisfactory construction for domestic properties as it avoids the need for ventilation of the roof. This is placed over the roof joists and a. Inverted warm deck roof the insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering. This type of construction has the insulation above the roof deck thus keeping the deck warm.

Warm roof ventilation specification for a simple duo pitch roof bs 5250 specifies sufficient ventilation as being. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. In a warm roof the thermal insulation is immediately below the membrane finish the structural deck any voids and the ceiling are at a temperature close to that of the building s interior condensation control is achieved by using a vapour control layer vcl on the warm side of the insulation. The wallplate is then used to secure the rafter to.

The wallplate is secured to the internal wall separated by dpc.