Weight: Clad over solutions can be too heavy for the existing frames as they use heavy timber, insulation materials and tiles. Any old conservatory needs to have a roof that is lightweight. The lightest solid roof systems weigh around 31KG/M ².
Tip: Always ask your installer for the total unit weight of the new roof per Sq.M
Fire Safety: By their very nature, ‘clad-over’ systems do not meet current fire safety regulations as they are never effectively fire tested as a complete roof structure, which is necessary to meet this part of building regulations. The original structure varies from job to job which means that only individual components could may have been tested. Solid roofs must be classified as AC, AB or AA in accordance with BS476-3.
Tip: Ask to see the fire safety certificate of the entire roof system before you commit to the project.
Building Regulations: Clad over systems do not generally get Building Regulation Approval due to their low thermal value or structural integrity. Do not confuse this with planning permission which is often not necessary. You are required to notify Building Control if you are making a change to any structure (including replacing a glass or polycarbonate conservatory roof with a solid roof) their approval ensures your new roof is structurally sound.
Tip: Check that local Building Control has been informed before the conversion starts. Obtain a Building Regulations ‘Final’ Certificate and file it in a safe place.