Damp proofing Recycled damp proofing A new damp proofing course made almost entirely from post consumer recycled materials has been developed by recycling firm Frank Mercer && Sons for Toughsheet Building Products. The launch of the Toughcourse Damp Proof Course follows the development over the past five years of the Toughsheet Damp Proof Membrane, which is BBA and PIFA certified, …