Cold Flat Roof Design Detail

Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.

Cold flat roof design detail.

This arrangement allows the deck to become cold. In cold climate zones the minimum total r value for the entire unvented roof assembly should be r 40. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. 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.

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. Warm cold and inverted. A flat roof must be strong durable and stable throughout its lifetime. 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.

The building regulations in the uk provide guidance on roof design. A cold roof system sees the insulation placed immediately above the ceiling between the joists with ventilation space above the insulation. Flat roof design guide. Installing a warm roof can be extremely straight forward and simple to do.

Basically there are two options to choose from when insulating a flat roof. Details both in 2d and 3d to give a clear understanding. Flat roof details and information relating to insulating a flat roof. Cold roof designing buildings wiki share your construction industry knowledge.

When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof. There are three recognised designs of flat roof construction. 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. Flat roof types.

In very cold climate zones this minimum r value should be increased to r 50. On a flat roof this could be air in at. Cold roof construction requires that a suitable ventilated air space exists above the insulation layer within which the air is constantly mobile being replenished by fresh incoming air whilst the air resident within the void space is being expelled via a natural vent action at another point. Compact unvented roof assembly r value increased to r 50 in very cold climate zones to control ice damming.

In a cold weather such roofs are inherently prone to condensation which can cause material decay and deterioration.