In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups.
Flat warm roof construction detail.
A warm flat roof is formed by placing a layer of insulation over the top of the roof structure.
The insulation is immediately below the waterproofing layer.
The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.
For additional stability you can also use steel joists that are built into one or both of the walls.
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.
A flat roof usually consists of the following.
Flat roof construction for residential.
2011 control of condensation in buildings is the document to view.
In terms of rules on ventilation bs 5250.
Waterproof membrane to prevent water penetrating the structure and interior of the building.
Flat roofs are usually made of variations of bitumen felt and function as durable long lasting roofs that are perfect for water run off in wet weather and protect wood and cement from potential build ups of damp and dry rot.
The sandwich warm deck roof is the most common type of flat roof.
Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists.
Having a manual for warm flat roof construction with details and a summary of rules to follow helps.
Steve from london flat roofing explains how warm flat roof construction works in this excellent short video.
This is placed over the.
In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction.
Due to the insulation being over the top of the roof the timber structure beneath is warm which is why the term warm roof is formed.
A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.
A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.
Pitched or sloping roof a pitched or slanted roof has a terrain of at least 15 but it is often much more.
Depending on the type of roof you are considering here s some technical details you may find useful.
The recognised flat roof build ups for best design practices are.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
Inverted warm deck roof the insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering.
