Structural waterproofing protects the structural integrity of a building, likewise damp proofing will also protect a structure. Dampness can be harmful to the integrity of a building. If not treated, water ingress can cause cracks in masonry along with extensive damage to bricks and mortar. Damp also changes the atmosphere of a structure. If a damp problem is not remedied, it may lead to more serious complications. Different types of dampness will require different treatments. Delta Membranes. DELTA Membrane Systems Ltd