Weight: Clad over solutions are sometimes too heavy for the current frames because they use heavy timber, insulation materials and tiles. An old conservatory should have a roof that is lightweight. The lightest solid roof systems weigh around 31KG/M ².
Tip: Ask your installer for details on the total unit weight of the new roof per Sq.M
Fire Safety: ‘Clad-over’ systems do not meet current fire safety regulations due to the fact that they have never actually been effectively fire tested as a complete roof structure (this is necessary to meet this part of building regulations). The structure varies in each job so only specific components may have been tested. Solid roofs must be rated as AC, AB or AA in accordance with BS476-3.
Tip: Remember to ask to view the fire safety certificate of the entire roof system before you go ahead with the project.
Building Regulations: Please note that clad over systems do not generally get Building Regulation Approval. This is because of their low thermal value or structural integrity. Please do not confuse this with planning permission (this is often not necessary). Please note you are required to notify Building Control if you are making an alteration to any structure (including replacing a glass or polycarbonate conservatory roof with a solid roof). The approval guarantees that your new roof is structurally sound.
Tip: Make sure that local Building Control has been told before the project starts. Get a Building Regulations ‘Final’ Certificate and keep it in a safe place.