- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 21 Nov 2017
On flat roofs, a 'warm roof' is one in which the insulation layer is laid on top of roof structure. This results in the structural deck and its supports being at a temperature closer to that of the building’s interior. This is as opposed to a 'cold roof' in which the insulation is below, or within the roof structure, and so the roof structure is closer to the outside temperature.
On pitched roofs, the definition of warm or cold can relate to the entire space below the pitch of the roof, but above the ceiling. This means that a warm roof might be one in which the insulation is installed in line with the rafters (rather than above the roof structure), so that the space under the pitch, ie a loft, attic or other space is insulated and warm. A cold roof in this case would typically have insulation laid above the ceiling so that the loft space below the pitched roof is cold relative to the rest of the property.
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
Results show guarded optimism and payment concerns.
Noteworthy navigable aqueducts.
Technology is making remote work a reality.
Carefully placed structures add drama to pastoral vistas.
Report provides actions required by 2030 to achieve a zero carbon economy.
What type of cool roof is most suitable?
Active Travel programme prioritises cyclists and pedestrians.
CIAT issues caution for use of new standard.
Industry leaders discuss climate change, the economy and other influences.
The building manager is key to operations.
The impact Scotland’s dynamic coast has on the historic environment.
IHBC announces role in new APPG.