Roof insulation is an insulating layer or provision within the roof construction, forming part of the building’s thermal envelope. Suitable execution relates to existing layers, junctions and use. A material name or thickness is not yet a complete design for the building.
During renewal, ask which assembly is present and how additional layers affect space around edges and penetrations. Moisture behaviour also deserves attention. A proposal should identify the starting points assessed and information still missing about concealed components within the existing construction.
This site calculates no insulation value, energy saving or subsidy amount. Any scheme conditions are separate from technical suitability and need current verification. Retain product and execution information in the roof dossier, linked to the areas where the measure was actually applied.
Worth asking
Frequently asked questions
Is greater thickness always the right choice?
That cannot be decided independently of the assembly. Have layers and junctions assessed together.
Does subsidy eligibility prove technical suitability?
No. They are separate questions requiring their own checks.