There is evidence that suggests that condensation in cold deck flat roofs is a problem.
Cold deck flat roof scotland.
The full deck was re boarded and an icopal monar plan single ply membrane system was fully installed as seen in the before and after photos.
Refurbishing an existing timber joisted flat roof which has no insulation.
They should be avoided therefore because interstitial condensation is likely and its effect on the structure and.
Cold roofs involve the thermal installation being installed between the joists and below the structural deck.
For the control of condensation in roofs including cold deck roofs bs 5250.
The insulation material is placed immediately above the ceiling between the rafters.
2002 provides guidance on the principal forms of construction.
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 roofs and warm roofs.
Although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common.
This is used for refurbishment e g.
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.
There are two types of flat roof.
A cold deck is constructed as follows.
The insulation is below the deck but above the plasterboard.
The epdm rubber roof membrane is then installed using the contact adhesive onto the deck.
A cold flat roof is one where the insulation is between or between and below the roof joists.
In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.
The 18mm roof grade deck is then fixed on top of the rafters leaving suitable air flow between the insulation and the deck.
No ventilation is required for these types of roofs.
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 a cold roof the thermal insulation is laid between the joists below the structural deck.
Which ventilation solutions are available.
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.
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.
