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Building professionals and heritage preservation authorities recommend using a silicone damp-course for restoration work because it is convenient, inexpensive, highly effective to stop rising damp and it preserves the original wall materials. With Ab-Tech Damp Proofing Liquid and expert advice, you can do the work yourself and save money.

The first stage of the treatment is drilling the holes to allow distribution of the Ab-Tech damp-course material into the wall.
For external walls, choose a horizontal mortar course or a notional line, about 100-300mm above the footing or adjacent paths or ground as the guideline to start the holes. For internal walls, start drilling just above the skirting boards or alternatively, the skirtings can be removed and the holes started from just above floor level. Please ask for advice if you are unsure about the correct location of the new damp-course for your job.







Drilling bricksDrilling bricks







Wacker drilling into stone wallSilicone damp-course

Wacker-Chemie GmbH




The second stage is the application of the Ab-Tech siloxane damp-proofing liquid into the drilled holes using a pump or any convenient dispensing aid, such as a plastic bottle. The liquid is applied without any pressure by gravity feed into the holes, to soak in naturally by capillary action. We recommend the STM hand pump for 20L cans and a plastic sauce bottle, as the most convenient aids for DIY.


Calculate the quantity of damp proofing liquid needed for a target section of wall, according to the "Typical Application Rates" sheet. For example:


Fill the holes in the chosen section in sequence, approximately the same small amount into each hole to help get a uniform distribution along the wall. After the liquid has been absorbed, return to the start and refill in the same sequence. Repeat the refilling for as many times as necessary, until the calculated quantity of damp proofing liquid for the target section has been absorbed.

DIY liquidDIY liquid close-up

The repeated refilling process may take a few hours or even longer to complete, depending on the porosity of the wall. The liquid keeps soaking for several days after application. Do not attempt to short-cut and use insufficient liquid, otherwise the whole effort will be wasted.

If the wall is cracked or otherwise damaged the liquid may drain from some holes on to the ground without being absorbed into the wall. Avoid refilling these holes. Either drill new holes that will hold the liquid or apply additional liquid to the adjoining holes, to obtain complete saturation. Alternatively, a mortar plug, cotton wool or sponge wadding can be pushed into the problem holes, to help hold the liquid so it soaks into the wall. If the liquid stays in the wall, sometimes accumulating in some voids, it will eventually soak throughout the wall, particularly being distributed by capillary action in the very porous old lime mortar in old walls.

After the silicone treatment, patch the holes with matching mortar or plaster, as appropriate.


Caution: Ab-Tech Damp Proofing Liquid is a petroleum liquid, with similar safety characteristics to kerosene, requiring safe handling and storage. Please refer to the Safety Precautions information on the product can labels. Avoid exposure of the liquid to water or moist air during handling and storage as this may prematurely cure the silicone content and make it ineffective for application.




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Apply the liquidPatch the holes



SALT DAMP SHOP, Adelaide, South Australia
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