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 Benefits
Dryzone has a number advantages over conventional chemical injection damp-proofing systems for both the contractor and the householder:
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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 DPC pump required
Can be used in situations where power is not available. -
Effective
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 on the ‘downloads’ tab of this page. For those requiring more detail, a 19-page guide to Rising Damp & its Control can also be downloaded.
Maximised DPC performance
The graph across shows the performance of high-strength DPC cream in a typical lime mortar compared with a low-strength DPC cream.
When treating rising damp, it is important to use a high-quality product that is capable of a level of performance as close as possible to a physical DPC. Performance of DPC creams vary depending on a number of factors like: mortar type, moisture content, pore structure but most of all, formulation and strength.
The Importance of Effective Damp-Proofing
| Standards & Accreditations | |||
|---|---|---|---|
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Certificate 97/3363 |
Certificate PB 5.1/08‑358/1 |
Report number 622X646‑11 |
Report number 403.275 |
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Report number 0976/11/R12NM |
Report number A‑58/2012 |
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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 Damp-Proofing Cream has been formulated to form an effective DPC 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
Dryzone for all
Whether working on a new build or renovating a home, Dryzone DPC Cream can be used to install a new damp-proof course.
Silane/Siloxane formulation optimised for compatibility with a wide range of mortar types and combinations:
- Suitable for brick, stone & rubble construction
- Suitable for porous and low-alkalinity mortars
- Suitable for lime and cement-based mortars
Comparative Test
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.
Wall Thickness
| 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 |
Dryzone Application
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First create a series of horizontal drill holes along the mortar course. Typically these holes are 12 mm in diameter and drilled at 120 mm intervals – refer to the Dryzone Application Instructions for details for particular wall thicknesses.
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Insert a Dryzone cartridge into the applicator gun, ensuring the pressure piston is fully extended.
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Cut into the end of the cartridge so that cream will be able to flow freely. Screw the nozzle cap back onto the gun.
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Fully insert the nozzle into the first drilled hole, and then inject Dryzone cream while withdrawing the nozzle at a steady rate. Stop injecting just before removing the nozzle from the wall. Repeat for remaining holes.
Once the Dryzone is installed, it diffuses before curing to form a water-repellent resin. This prevents the damp from rising up the wall.
Replastering
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.
For Rising Damp treatment
Dryzone is not suitable for application to walls as a treatment for penetrating damp. Dryzone’s sister product, Stormdry Masonry Protection Cream should be used instead.