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.

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. This is known as a cold roof because the roof deck and roof space are close to the external air temperature. Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.

In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. The vapour control layer is above the decking but below the insulation. There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof. 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.

There are three recognised designs of flat roof construction. 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. 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. The insulation can be adhered mechanically fixed or loose laid.

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. Ventilation is required for these roofs. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. The insulation is immediately below the waterproofing layer.

The epdm rubber roof membrane is then installed using the contact adhesive onto the deck. In a warm deck roof the insulation is positioned above the structural deck and no ventilation is required.