Flat Warm Roof Construction Detail

The 3 most common materials used for flat roof construction.

Flat warm roof construction detail.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. 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. Others would treat even steeper pitches as flat roofs. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

A flat roof must be strong durable and stable throughout its lifetime. This usually keeps the deck warm. 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. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof.

Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets. Hot tar and gravel. Depending on the type of roof you are considering here s some technical details you may find useful. 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. The construction of the flat roof is similar to that of the timber upper floor. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow. Warm roof systems.

This is placed over the. Types of flat roof construction warm and cold flat roofs. 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. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.

They can be built up from profiled metal decks as the insulation selected would provide enough rigidity to span the open sections of such decks. Flat roof types. In a warm flat roof construction the insulation is positioned above the structural deck and no ventilation is required. Flat roof details and information relating to insulating a flat roof.