Flat Warm Roof Construction Detail

Types of flat roof construction warm and cold flat roofs.

Flat warm roof construction detail.

The 3 most common materials used for flat roof construction. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof. Details both in 2d and 3d to give a clear understanding. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.

Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets. The construction of the flat roof is similar to that of the timber upper floor. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. A flat roof must be strong durable and stable throughout its lifetime.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. It must provide adequate protection against the elements keeping the buildings structure and interior dry. It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

In a warm flat roof construction the insulation is positioned above the structural deck and no ventilation is required. This is placed over the. Depending on the type of roof you are considering here s some technical details you may find useful. Warm roof systems.

This usually keeps the deck warm. Others would treat even steeper pitches as flat roofs. Hot tar and gravel. 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.

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. In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm. 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. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building therefore the roof structure is protected from extremes of hot and cold lessening the.