Weight: A clad over roof can be too heavy for some older types of conservatory framework as it uses some heavy timber, insulating materials and tiles. It must be more lightweight than that. 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: ‘Clad over’ systems do not satisfy fire safety regulations as they are not effectively fire tested as a complete roof structure, which is imperative to comply with the relevant section of building regulations. Often, only certain components may have been fire tested, which isn’t enough. Solid roofs must be classified as AC, AB or AA in accordance with BS476-3.
Tip: Request sight of the fire safety certificate for the roofing system before any work begins.
Building Regulations: Very rarely will a clad over system receive Building Regulations Approval too as it lacks thermal performance and has poor structural integrity. We must stress that Building Regulations Approval isn’t the same thing as planning permission. You will have to inform Building Control when you are proposing to make some sort of change to your conservatory (including replacing a glass or polycarbonate roof with a solid roof), who will need to confirm that it is structurally sound.
Tip: Don’t begin with a conversion before telling Building Control what you’re proposing to have done. When given the Building Regulations ‘Final’ Certificate at the end of the project, please keep it safe.