Weight: Existing frames can rarely cope with a clad over solution as it uses heavy timber, insulation materials and tiles. It is imperative that any new conservatory roof 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: ‘Clad over’ systems also fail to comply with current fire regulations as they are not sufficiently fire tested as a complete roof structure, which they need to if they are to satisfy this part of building regulations. It may transpire that only certain components of the original structure have been correctly 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: Due to their low thermal value and low structural integrity, clad over systems rarely receive Building Regulations Approval. This is, however, not the same as planning permission, which usually isn’t needed. When modifying an existing structure, such as replacing a polycarbonate or glass roof with a solid roof, you need to notify Building Control before you do anything, who will decide is the replacement roof is structurally sound.
Tip: Don’t begin with a conversion until local Building Control has been informed first. Keep the Building Regulations ‘Final’ Certificate in a safe place.