 Most forms of dampness can be prevented by thoughtful building design and careful construction.In the UK, well built modern houses include damp proofing in the form of a synthetic damp-proof course (DPC), about 15 cm above ground level, to act as a barrier through which water cannot pass.Slate or "engineering bricks" with a low porosity were often used for the first few courses above ground level, and these can help minimise the problem.