Cold Flat Roof Design Detail

In the case of a flat roof insulation is usually in the form of either a rigid board above the deck or a fibrous quilt immediately above the ceiling depending on the type of roof construction.

Cold flat roof design detail.

Flat roof details and information relating to insulating a flat roof. This arrangement allows the deck to become cold. In the case of cold roofs the residential flat roofs have the waterproof placed directly on the deck and any insulation would be placed above the ceiling. A cold roof is roof in which the thermal insulation layer is located between the ceiling joists meaning that everything above the insulation such as the rafters and any roof space will be colder than the living space below it.

Basically there are two options to choose from when insulating a flat roof. Cold roof designing buildings wiki share your construction industry knowledge. Installing a warm roof can be extremely straight forward and simple to do. There are three recognised designs of flat roof construction.

In cold climate zones the minimum total r value for the entire unvented roof assembly should be r 40. A cold roof system sees the insulation placed immediately above the ceiling between the joists with ventilation space above the insulation. When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof. Compact unvented roof assembly r value increased to r 50 in very cold climate zones to control ice damming.

Flat roof design guide. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Optimum roof assembly design to enclose pool. Details both in 2d and 3d to give a clear understanding.

Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings. The building regulations in the uk provide guidance on roof design. The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof. There are design differences for each type.

In a cold weather such roofs are inherently prone to condensation which can cause material decay and deterioration. Warm cold and inverted. In very cold climate zones this minimum r value should be increased to r 50. Flat roof types.

On a flat roof this could be air in at.