Damp can be caused by a variety of factors, so you need to know what the root cause is before coming up with a solution. We have a lot of experience in damp so please call for advice. However if you know that it is rising damp and you have brick or block walls with lime mortars then DryZone is the answer. We have tried other manufacturers but found them wanting. Damp proofing can done by removing cement renders, using lime putty renders, digging trenches / drains, using breathable paints etc etc. If in doubt call for a Home Report from us.