Warm Flat Roof Construction Uk

The cold roof although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common.

Warm flat roof construction uk.

The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. This approach uses insulation with no air gap either immediately above or below the roof deck. Others would treat even steeper pitches as flat roofs. Guidance advice on warm cold roofs www cncbuildingcontrol gov uk.

Flat roof construction can come in the form of a warm roof or cold roof depending on the requirement of the owner and architect as they relate to the building regulations regarding heat loss and insulation. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. The membrane is then attached to the insulation. A vapour control layer must be used below the insulation.

Types of flat roof construction warm and cold flat roofs. Flat roof constructions are generally classed as either cold or warm roofs depending on the position of the thermal insulation. Construction studies drawing detail showing how to draw a flat roof warm deck construction detail to a scale of 1 10 with a short introduction highlighting t. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof.

The 3 most common materials used for flat roof construction. Flat roof u value 0 18 w m2k 2 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 placed over the. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.

In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm. This video shows detailed drawing. 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. Hot tar and gravel.

This is where the insulation is typically packed between the rafters. A 50mm air gap must be left.