Cold Flat Roof Design Detail

There are design differences for each type.

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. A cold roof system sees the insulation placed immediately above the ceiling between the joists with ventilation space above the insulation. Compact unvented roof assembly r value increased to r 50 in very cold climate zones to control ice damming. Details both in 2d and 3d to give a clear understanding.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Cold roof designing buildings wiki share your construction industry knowledge. Optimum roof assembly design to enclose pool. In very cold climate zones this minimum r value should be increased to r 50.

In a cold weather such roofs are inherently prone to condensation which can cause material decay and deterioration. The building regulations in the uk provide guidance on roof design. There are three recognised designs of flat roof construction. This arrangement allows the deck to become cold.

Flat roof design guide. A flat roof must be strong durable and stable throughout its lifetime. Basically there are two options to choose from when insulating a flat roof. Flat roof details and information relating to insulating a flat roof.

Warm cold and inverted. It must provide adequate protection against the elements keeping the buildings structure and interior dry. In cold climate zones the minimum total r value for the entire unvented roof assembly should be r 40. 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.

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. On a flat roof this could be air in at. Flat roof types. 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.

Installing a warm roof can be extremely straight forward and simple to do.