04 – Compton Spa Apex 20′ x 17′. Circa 1995. Purley, Surrey. Before After Compton Spa Apex 20′ x 17′. Circa 1995. Purley, Surrey. Original roof: Unicem B9 – splitting, damp and mouldy. Replacement roof: Anti-condensation box profile in Merlin grey plastisol.