Dryzone Damp-Proofing Cream
Launched in 2000, Dryzone Damp-Proofing Cream has caused a revolution in the treatment of rising damp.
The patented Dryzone System now outsells our traditional chemical injection damp-proofing treatments and is the best-selling rising damp treatment on the UK market.
Dryzone has a number advantages over conventional chemical injection damp-proofing systems for both the contractor and the householder:
- Quick to install
Up to 3 times faster than standard damp-proofing injection systems.
- Simple to install
Less scope for operator error
- Concentrated formulation
Eliminates the need to introduce large volumes of liquid carrier into the wall. Dryzone is over four times stronger than many competing products.
- Low hazard
Non-caustic, non-flammable, not injected under pressure.
- Solvent-free formulation
Does not contain white spirit or iso-paraffins.
- Spillage & mess virtually eliminated
No problems with damp-proofing fluid leaking into neighbouring rooms or properties.
- No electric damp-proof course (DPC) pump required
Can be used in situations where power is not available.
Independent tests demonstrate that Dryzone provides a more effective barrier to rising damp than competing products.
Full instructions for installing Dryzone Damp-Proofing Cream can be found in the Dryzone datasheet which can be downloaded from this page. For those requiring more detail, a 19-page guide to “Rising Damp & its Control” can also be downloaded.
The Importance of Effective Damp-Proofing
Naturally, homeowners want the most effective products available to be used to treat rising damp in their properties. Creating the best possible barrier to rising damp minimises moisture in the wall, blocks the build-up of ground salts, and reduces heat-loss. For this reason, Dryzone has been formulated to form an effective damp-proof course in walls of all types and has been tested under more conditions than any other rising damp treatment on the market.
This is important because no two walls suffering from rising damp are the same. In particular the physical properties of the mortar used to construct walls can vary considerably and this can have a significant influence on the effectiveness of any rising damp treatment.
The effectiveness of Dryzone has been verified under a wide range of test conditions by independent test houses around the world. Test conditions examined include:
- Saturated walls (up to 95% saturation)
- Low alkalinity mortar
- High alkalinity mortar
- Low porosity mortar
- High porosity mortar
- Lime-based mortar
- Cement-based mortar
An independent test report comparing the effectiveness of Dryzone with that of a competing low-strength damp-proofing cream can be downloaded free of charge in PDF format by clicking on the image to the right.
The report was carried out by the University of Portsmouth and published in February 2008.
Treating Walls of Varying Thicknesses With Dryzone
The depth of each drill hole required for various thicknesses of solid wall is shown in the table below. For all other types of wall, the depth of the hole should be to within 40 mm of the opposite face. In all cases the most effective target site is to drill horizontally directly into the mortar course, preferably at the top of all perpends of the selected course.
|4½″ (115 mm)||9″ (230 mm)||13½″ (345 mm)||18″ (460 mm)|
|Depth of Drill Hole||95 mm||210 mm||325 mm||440 mm|
|Drill Hole Intervals||120 mm||120 mm||120 mm||120 mm|
Once the Dryzone is installed, it diffuses before curing to form a water-repellent resin. This prevents the damp from rising up the wall.
As with all remedial damp-proofing systems, it is necessary to remove and replace any salt-contaminated plaster. The introduction of our hybrid plasterboard method, the Dryzone Express Replastering System has greatly simplified this process. See our page on replastering as part of a rising damp treatment for details of replastering systems available.
For heritage projects, or where replastering needs to be minimised Dryzone Renovation Plasters should be used.
Suggested NBS specification clause: C45-220
Visit our NBS page for further information on specifying Safeguard products using NBS.