It features Islamic design elements, including arches, vaulted ceilings, carved balconies One of the Grand Mosque's largest expansions, the project accommodates over two million worshippers.

One of the signs that your ceiling should be vaulted by a professional contractor ... Whether you're using a rigid foam, a spray foam, or rolling out fiberglass batting, insulation should be secured ...

For months after Daphne Wood had spray foam roof insulation installed, she was surprised to receive cold calls every week from firms badgering her to spend thousands of pounds – to have it removed.