In a cold roof, insulation is placed at ceiling level, leaving the roof space above uninsulated and requiring ventilation to control moisture build-up and prevent condensation. Conversely, a warm roof has insulation installed above the roof structure, keeping the entire roof space within the building’s thermal envelope, retaining heat and reducing potential moisture and condensation build-up.

A warm roof generally offers better energy efficiency by minimising thermal bridging and maintaining consistent temperatures within the roof space. However, cold roofs can be more cost-effective and are suitable for certain applications, provided they are properly ventilated.

Common insulation materials for cold roofs include mineral wool, fibreglass batts, and rigid foam boards. These are typically installed between the ceiling joists, with a ventilation gap above to allow air circulation and prevent condensation.

Yes, we have a digital library of installation drawings showing the details of a cold roof installation with a variety of roof build ups. To find the detail suitable for your project, visit our drawings and downloads page. Here you will find warm roof details too.

A ‘between the rafters’ installation involves fitting the rooflight within the depth of the existing rafters, rather than mounting it on top. This method is typically employed for creating a flush finish with The Conservation Rooflight when the roof build-up is less than 98mm.

An ‘on the rafter’ installation involves mounting the rooflight directly on top of the existing rafters, rather than fitting it within them. This method is typically suitable for installing for The Conservation Rooflight when the roof build-up is 98mm or more, allowing for a flush finish with the roofline.