Cold Deck Roof Detail

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.

Cold deck roof detail.

The 18mm roof grade deck is then fixed on top of the rafters leaving suitable air flow between the insulation and the deck. The insulation is immediately below the waterproofing layer. 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 potential for. This is known as a cold roof because the roof deck and roof space are close to the external air temperature.

In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. There are three recognised designs of flat roof construction. Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.

This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1 10. In cold and very cold climates selecting a roof deck condensing surface temperature criteria of 45 f is very conservative. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. The vapour control layer is above the decking but below the insulation.

In a warm deck roof the insulation is positioned above the structural deck and no ventilation is required. In a warm roof construction the principal thermal insulation layer is located above the structural decking resulting in the structural deck and support structure being at a temperature close to that of the interior of the building. Warm cold and inverted. Ventilation is required for these roofs.

The epdm rubber roof membrane is then installed using the contact adhesive onto the deck. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.