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The Research

◊ Test I: The Research Δ


The system is being tested In 1988, scientific research was done on the Schrijver systeem®. The research consisted of two tests, and the results of the first test below shows excellent results. In this test the water saturation of two test walls was registered for a period of 12 weeks. Both walls had been placed into containers for 3 weeks to absorb water until the point of saturation was reached and the level of water absorption had dropped to a minimum.
Table 1 shows a clear difference between wall A (with the Schrijver systeem®) and the wall without the system in terms of relative humidity (RH).



Readings in the cavity
Date   Wall A   Wall B   Difference A & B in %
21 November   83% RH   95% RH   12% RH
19 December   62% RH   94% RH   32% RH
21 January   50% RH   82% RH   32% RH

Readings behind the cavity
Date   Wall A   Wall B   Difference A & B in %
21 November   42% RH   57% RH   15% RH
21 January   31% RH   49% RH   18% RH
table 1


Reduction of relative humidity with Schrijver systeem® Reduction of relative humidity without Schrijver systeem®
graph 1
◊ Test II: Test Results Δ

The system is being tested Every day throughout the test period, each element removed 339 ml of water in the wall fitted with the Schrijver systeem® (wall A). Only 140 ml of water was removed from wall B without the system (see table 2). (1000 ml is approx. 1/5 gallon). A difference of almost 200 ml per element per day!
The impact the Schrijver systeem® has on the relative humidity (RH) was also recorded (figure 2). Here the test results were remarkable too. The RH in the enclosed space behind wall A where the Schrijver systeem® was located was lower by 30% than the RH in the space behind the wall without the system. An outstanding result.


Date Wall A
with Schrijver systeem® 		Wall B
without Schrijver systeem® 		Difference A & B in milliliters
28 October 0 mL 0 mL 0 mL
6 November 1350 mL 830 mL 485 mL
12 November 3000 mL 1720 mL 1280 mL
27 November 3649 mL 1000 mL 2649 mL
14 December 4600 mL 1850 mL 2750 mL
2 January 5300 mL 950 mL 4350 mL
total with wind 52123 mL 21539 mL 30584 mL
table 2

There is a clear difference between wall A and wall B. After 11 weeks and using only two elements, the difference was more than 30 liters (6.6 gallons)! As the Schrijver systeem® works all year round, it will continue to remove damp after the 11 week period, as it is an ongoing process.

  Wall A Wall B Difference A & B in milliliters
total without wind 72 mL 9 mL 63 mL
table 3


Even without windy weather conditions, wall A with the Schrijver systeem® removes substantially more water than wall B without the system installed.

Water reduction in both walls compared
graph 2


◊ Summary Δ

The Schrijver systeem® is an essential factor in eliminating, preventing and controlling problems caused by damp. The multifunctional results (dry walls and a decrease in the relative humidity within the house) brought about this system, means that you can achieve a dry and healthy living environment and a substantial cut in heating bills. Thanks to this system the building will be better preserved. The system requires little maintenance once it's been installed. In short: a unique, environment friendly system, which you should not be without in a countries such as the United Kingdom!
◊ References Δ

References: Who uses the Schrijver systeem®? Continue reading ...