Tried and tested

The Holland Damp Proof System® has undergone extensive testing to guarantee its effectiveness.

In 1988 the first scientific research was done on the Holland Damp Proof System®. The research consisted of two tests, which showed excellent results and proved how well the system worked.

In the first test, water usage in two test walls was measured over an 11-week period. Both walls had three weeks to adsorb water to saturation point.

Every day throughout the test period, 678ml of moisture evaporated from the wall with two bricks of the system fitted [Wall A], compared to just 280ml from the wall without the system [Wall B].

This works out at almost 200ml of moisture removed per brick, per day. [Fig 1]

In the second test, the relative humidity [RH] was measured over the same period of time.

It was measured in the cavity and the area behind the wall [simulating the inside atmosphere of a property].

The RH in the tested areas of Wall A was significantly lower than the tested areas of Wall B. [Fig 2 & 3]

After 11 weeks, and using only two specially designed bricks in the testing, there was a difference of more than 30 litres.

In reality, the Holland Damp Proof System® uses 50 bricks on an average semi-detached home.

In 2008 further independent research was completed by a Liverpool John Moores University student reading Quantity Surveying.

Under test conditions the results confirmed the Holland Damp Proof System® works well in removing damp from walls.