Weight: Clad over systems tend to be excessively heavy due to their timber framework, insulation materials, and tiles, which can strain existing frames. For those seeking a lightweight roof, it’s crucial to note that the lightest solid roof systems weigh approximately 31 kilograms per square meter (31KG/M²).
Tip: To ensure a suitable fit, always inquire about the total unit weight of the new roof per square meter from your installer.
Fire Safety: It’s important to understand that a ‘clad over’ system may not comply with current fire safety regulations. This is because it may not have undergone thorough fire testing as a complete roof structure, which is a prerequisite to meet relevant building regulations. While individual components may have been tested, solid roofs must be classified as AC, AB, or AA in accordance with BS476-3.
Tip: To be on the safe side, never commit to such a system until you’ve reviewed the fire safety certificate for the roof.
Building Regulations: Typically, clad over systems are unlikely to receive Building Regulations Approval due to their poor thermal insulation and structural integrity. It’s essential to distinguish between building regulations approval and planning permission. While planning permission is often not required, you must inform your local Building Control if you’re making structural changes, including replacing a polycarbonate or glass conservatory roof. They need to verify its structural soundness.
Tip: Ensure that your project doesn’t commence until Building Control is informed, and be sure to keep the Building Regulations Final Certificate safely stored.