Rising Damp

Problem

Rising damp is an issue that has the potential to affect any building. It is a particular problem in older houses where the original rising damp treatment (or damp proof course) has become damaged.

It can also be a problem when the ground level around a property has been raised with the addition of a new path or drive way, known as lateral penetration of damp.

Over time, water from the ground works its way through the brick work, stone work or through the mortar by capillary action.

Solution

At JCJ we always look to resolve the issue by tackling the source of the problem. Unfortunately with rising damp the source of the problem is ground water, which can not be completely removed.

Our solution acts to prevent moisture entering your property at the earliest possible opportunity and can be approached in two ways:

1. Injection of new damp proof course, to stop further moisture rising.
2. Reduce ground level (if possible) or create an internal barrier between wet structure and finished surface.

Process

Injection of new damp proof course: remove affected plaster – minimum of 1000mm above ground level and 300mm further than the highest affected area. Drill 12mm holes at 120mm intervals and inject a silane / siloxane DPC cream. A specialist plastering or dry lining specification should be followed to complete the process, this also protects against salt contamination.

Reduce ground level/create an internal barrier: If it is possible to reduce the external ground level, then this will be determined on site and in most cases is the ideal solution. If this is not possible the process involves removing affected plaster to a minimum of 300mm above the affected area injecting a DPC cream (following the process above) at the raised external ground level. Install a waterproof membrane and apply a bonding and finish coat of plaster.

Associated damp issues:

- Salt Contamination
- Timber Treatment

Download our Rising Damp factsheet

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