No insulation is on top.
Hybrid warm deck flat roof.
In this context the term hybrid flat roof refers to a timber flat roof construction that is insulated both between and over the joists.
Flat roofing solutions the xtratherm range of high performance insulation boards provides the ideal technically advanced solution for flat roof projects.
The recognised flat roof build ups for best design practices are.
However this is a general guide and could change depending upon the building use location and humidity class.
In each case the name refers to the position of the insulation in relation to the roof deck.
Warm cold and inverted.
A warm roof features a structural deck vapour control layer insulation and waterproofing a tried and tested solution that the industry knows works.
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.
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There are design differences for each type.
Hybrid cold flat roof.
A hybrid cold flat roof is one where at least 2 3rds of the insulation is above the roof deck or joists.
Single ply pvc no backing flat roof board hybrid 25 hybrid 25 is a laminated flat roof insulation board with our jablite flat roof board factory bonded to a 25mm thick fibre faced pir panel.
Flat roof design guide.
Traditionally flat roof constructions fall in to two camps.
The roof itself is therefore kept warm.
In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately.
Ventilation is not needed in a warm roof.
Flat roofs are among the simplest construction elements that can feature in a building.
A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck.
The two classic types of flat roof designs are the warm flat roof and the cold flat roof.
Xtratherm manufactures an extensive range of high performance pir flat roof insulation boards that include tapered insulation providing comprehensive technically advanced solutions for all.
In addition there s a third type the warm flat roof with airflow that s essentially a hybrid version of the warm flat roof and the cold flat roof.
The laminate provides separation from the membrane and protection from solvents during installation of the weatherproofing.
Easily the most frequently asked question to the celotex technical centre is with reference to hybrid flat roofs.
However the presence of insulation below the deck in a hybrid roof brings the dew point down potentially threatening the roof structure and spaces below it.
In a warm roof construction with no height restrictions insulation levels can ensure that no condensation occurs within the build up.
Warm flat roofs and cold flat roofs.
In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups.
