Tanking/Penetrating Damp
The Tanking system is generally used in the control of penetrating damp in earth retaining walls usually in basements and below ground level. The symptoms are generally the same as rising damp, flaking plaster, spongy soft feel to wall, white powder or crystals appearing on wall, lifting and stained wallpaper, but unlike rising damp which will usually stop around a metre above ground level, penetrating damp can spoil the whole wall from top to bottom.
Why the tanking system and not DPC injection?
In earth retaining walls, vaults and many basements the problem is not that moisture is rising but penetrating from all around, thus a DPC would not be of any use as it only controls the flow of water through the wall by capillary action. Also the levels of moisture and hygroscopic/deliquescent salts are much higher than in walls suffering from rising damp, therefore the usual specialist re-plastering would not have the desired effect.
What System to use?
At 1st Damp Line we tend to use the Sika tanking System which is a cementatous system that has been a proven treatment in the control of penetrating damp for over 60 years and seems to have become the industry standard. The other method used by ourselves is the cavity drainage system which consists of sealing all walls and floors with a plastic membrane and a pump fitted to drain all water away and finished by dry lining. Which ever method used we give long term guarantees on both treatments ranging from 10-20 years.
Why the tanking system and not DPC injection?
In earth retaining walls, vaults and many basements the problem is not that moisture is rising but penetrating from all around, thus a DPC would not be of any use as it only controls the flow of water through the wall by capillary action. Also the levels of moisture and hygroscopic/deliquescent salts are much higher than in walls suffering from rising damp, therefore the usual specialist re-plastering would not have the desired effect.
What System to use?
At 1st Damp Line we tend to use the Sika tanking System which is a cementatous system that has been a proven treatment in the control of penetrating damp for over 60 years and seems to have become the industry standard. The other method used by ourselves is the cavity drainage system which consists of sealing all walls and floors with a plastic membrane and a pump fitted to drain all water away and finished by dry lining. Which ever method used we give long term guarantees on both treatments ranging from 10-20 years.
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