We don't like dampness in walls!
A capillary water barrier based on synthetic resin/rubber

Capillary Barrier System Stops Upward Moisture Migration

Product Information 

CavaStop 300 is a chemically balanced capillary barrier compound made up of impregnating agents, synthetic resins and synthetic oils. It forms a long-lasting, permanently elastic capillary water barrier which is practically inert to all forms of environmental attack. Unlike silicification compounds,

CavaStop 300 does not become brittle on solidification and crack as a result of earth tremors or other vibration of the structure.

CavaStop 300 capillary barrier compound has excellent resistance to UV radiation and below-freezing temperatures and is unaffected by acids and alkalines.

CavaStop 300 provides excellent elasticity and long-term durability. Like all water repellent compounds,

CavaStop 300 is suitable for waterproofing pores and capillary passages, but cannot be used to seal against pressing water.

Application fields

Basement and foundation walls. Can be used with all mineral construction materials including sand lime brick, brick, sandstone, concrete, aerated concrete, quarrystone, etc.

Application method

Remove old, loose plaster containing saline deposits, etc. to 50 cm above the visible moisture level. This can be done either before or after application of the capillary barrier. Make the boreholes as specified in the processing instructions for the type of structure treated. Remove any dust and foreign material in the boreholes and insert a CavaStop 300 cartridge into each borehole. After the cartridges are completely empty, remove them and seal the boreholes using cement mortar or other appropriate material.


The boreholes for the CavaStop 300 cartridges are normally made at a height approx. 10–15 cm above floor level when bored from the inside. If bored from the outside, they are located approx. 10–15 cm above ground level or immediately below the ground floor. The spacing between the boreholes depends on the thickness and construction of the wall and the material quantity used.

The borehole locations are determined using the borehole table and the borehole location diagramme. The boreholes should be angled downward at 40°. They should have adiameter of 16 mm and should extend to within approx. 5 cm of the other wall surface. CavaStop 300 is introduced into the boreholes by simply inserting the opened cartridges. Ensure sufficient ventilation during the application process and for some time afterwards. Reaction of the CavaStop 300 components within the structure takes place within a period of 4–10 weeks after application. Moisture in the wall above the new horizontal barrier dries out after treatment; for instance in a 36 cm thick wall, drying out is normally complete after 18–24 months.

Buildings with basement

Renovation treatment: Apply CavaStop 300 from the outside of the structure at a level below the ground floor and above ground level. No excavation is required. Then apply surface waterproofing coat and dehydration plaster.