Most types of traditionally built masonry wall can be treated using Dryzone damp proofing cream. However, some walls should not or cannot be suitably treated e.g rattrap bonded brickwork. Special procedures may be required for certain types of masonry e.g. perforated brick and some types of blockwork.
Where a wall has been contaminated with a detergent or where a masonry sterilant contacting a surfactant has been used a water repellent type chemical damp-proof course may be unsuitable.
Earth retaining walls can only be treated above ground level. That area below ground must be suitable ‘tanked’ to prevent lateral moisture penetration.
Dryzone damp proofing cream is designed to cause water repellency. The water repellent material lines the pores of the masonry and on curing, the water repellent causes a modification of the interface tension between the wall of the pore and the water. In an untreated pore the ‘contact angle’ is less than 90° and the interfacial tension causes the water to rise. Following application of the water repellent the interfacial tension changes. The contact angle becomes greater than 90° and the resulting tensions now cause a slight downward ‘pressure’ so preventing the future rise of water. The Dryzone system does not block the pores.
Dryzone is a revolutionary concept made possible by modern technology for the control of rising damp in masonry. The principle is very simple and requires no
- electrical pumps
- high pressure systems
- or excess fluids in the form of a water or white spirit carrier
Dryzone damp proofing is a very high concentration of water miscible active ingredient in a cream formulation that cleverly utilises the moisture already in a damp wall to aid its distribution. This significantly minimises the occurrence of ‘fingering’ associated with pressure injected systems and Dryzone has the further advantage of an inherent slow curing process that ensures the maximum diffusion potential.
Of other significant importance is the vapour phase of Dryzone, which imparts considerable water repellent properties into adjacent masonry. The combined effect is the most revolutionary and effective method of controlling rising damp by a chemical process to be introduced in over 40 years. Of further significant importance is the simplicity of the introduction process that makes it difficult to install ‘incorrectly; and is therefore less reliant upon good operative technique.