The Holland Damp Proof System® is a clever damp proofing method based on a Dutch invention. It can be used as a replacement or new damp proof course or to combat condensation or penetrating damp problems. In 1997 this method was brought to the UK by Dutchman Drs. Evert de Graaf. During the past 10 years Evert and his UK damp proofing companies have been working full time with this damp proofing method. 

Over the years the system has been adapted and improved to make it perfectly suitable for the UK housing market and it has now been successfully installed in thousands of UK properties ranging from mid-terraces to stone farm houses, and from local authority housing to holiday and shopping complexes.

Holland Damp Proofing UK Ltd., the only supplier of this improved product, has now branches in Cheshire, South Gloucestershire and London, and is the market leader in non chemical damp proofing.

The method is now a generally accepted method of damp proofing in the UK and is accepted by all banks, building societies and mortgage companies.

Since 1976, this method of damp proofing has been used in Holland, where more than half of the country lies below sea level and damp problems are prevalent. It is thought to have been invented by a chimney builder who noticed that chimneys can dry out quickly due to the constant air flow in them. 

This idea of using air-flow to for drying is an old idea used in all sorts of building techniques, from the design of barns where draughts keep crops dry, to suspended wooden floors in Victorian houses where the draughts under the floor keeps things dry.

A special hollow brick was developed which channels wind, using the venturi effect, through the wall and since 1976 these bricks have been fitted in over 25,000 homes in The Netherlands. Outside The Netherlands, the system is used in Belgium, France, Denmark, Portugal and Spain.

Only after extensive laboratory tests and the results of many test houses did the system receive its official patent in 1988. In the same year the system won first prize in the Dutch national competition for inventions (Nationale ideeenbus) which was held nationally. The UK rights for this system were acquired by Evert de Graaf in 1996.

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