Cold Flat Roof Construction Detail

Cold deck 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.

Cold flat roof construction detail.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. Warm cold and inverted. Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets. There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof.

Flat roof types. It is usually the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. A flat roof must be strong durable and stable throughout its lifetime. The construction of the flat roof is similar to that of the timber upper floor.

In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. In the case of cold. No ventilation is required for these types of roofs. The 3 most common materials used for flat roof construction.

Cold bridging through the system is easier to eliminate or control as ordinarily there are no breaches from the structural supports as there is in a cold roof construction. The membrane is then attached to the insulation. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. There are three recognised designs of flat roof construction.

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 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. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow. Hot tar and gravel.

It must provide adequate protection against the elements keeping the buildings structure and interior dry. In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm.