Weight: Because they use heavy timber, insulation materials and tiles, clad over solutions can be too heavy for existing frames. You need a lightweight roof for old conservatories. 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: Be advised that a clad-over system does not comply with fire safety regulations due to them not being fire tested as a complete roof structure, which they must be to satisfy these rules. The original structure varies from job to job which means that only individual components 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: It’s very rare that a clad-over system will receive Building Regulations Approval because of its low thermal value and structural integrity. A word of warning. Building Regulations Approval is completely different from planning permission. You must notify Building Control when making any changes to a structure, such as replacing an old glass or polycarbonate conservatory roof with a solid roof, so they can determine if the new roof is structurally sound enough.
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.