Cold Deck Flat Roof Scotland

A cold flat roof is one where the insulation is between or between and below the roof joists.

Cold deck flat roof scotland.

Cold roofs and warm roofs. Cold roofs involve the thermal installation being installed between the joists and below the structural deck. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below to create an effective barrier.

In general the installation of a cold roof is not recommended for the construction of new properties. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. The insulation is below the deck but above the plasterboard. In a cold roof the thermal insulation is laid between the joists below the structural deck.

Cold flat roofs are found in many homes around the uk though they are not recommended these days and are actually banned in scotland. The insulation material is placed immediately above the ceiling between the rafters. The epdm rubber roof membrane is then installed using the contact adhesive onto the deck. There are two types of flat 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. There is evidence that suggests that condensation in cold deck flat roofs is a problem. Although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common. The 18mm roof grade deck is then fixed on top of the rafters leaving suitable air flow between the insulation and the deck.

As the insulation is not required to take any loads quilts and other loose fill materials can be used as well as rigid insulation. 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. This is used for refurbishment e g. A cold deck is constructed as follows.

No ventilation is required for these types of roofs. They should be avoided therefore because interstitial condensation is likely and its effect on the structure and. Refurbishing an existing timber joisted flat roof which has no insulation. We have worked on may project for bizspace over the years and this particular one saw a flat roof stipped back to the metal deck on an office block in livingston.

Which ventilation solutions are available.