Hybrid Warm Deck Flat Roof

Ventilation is not needed in a warm roof.

Hybrid warm deck flat roof. 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. No insulation is on top. Warm cold and inverted. Traditionally flat roof constructions fall in to two camps.

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 either a rigid board above the deck or a mineral glass wool quilt immediately. The recognised flat roof build ups for best design practices are. Easily the most frequently asked question to the celotex technical centre is with reference to hybrid flat roofs.

Flat roofing solutions the xtratherm range of high performance insulation boards provides the ideal technically advanced solution for flat roof projects. A hybrid cold flat roof is one where at least 2 3rds of the insulation is above the roof deck or joists. A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. Flat roof design guide.

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. By majority the rule of thumb is that in a domestic house not flats approximately a third of the total thermal performance of insulation can be placed below the deck with two thirds above the deck sometimes this is called a hybrid warm roof. The roof itself is therefore kept warm. Hybrid cold flat roof.

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 two classic types of flat roof designs are the warm flat roof and the cold flat roof. In a warm roof construction with no height restrictions insulation levels can ensure that no condensation occurs within the build up. 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.

In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups. D h b p ch 5 0. Warm flat roofs and cold flat roofs. There are design differences for each type.

However this is a general guide and could change depending upon the building use location and humidity class. 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 each case the name refers to the position of the insulation in relation to the roof deck. 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 roofs are among the simplest construction elements that can feature in a building.