Knightsbridge, London, SW1X - (Damp Proofing)
This was an interesting case due to both the unique nature of the area in question and to the remedial action taken in which we were using a new product to specifically tackle this locality.
The area of concern was situated in a below ground city apartment in London, originally part of the whole house, the floors had been turned into individual units.
After surveying the property and trying to ascertain the cause, we concluded our findings.
A cavity drain membrane had been fixed as part of renovations to a room that lay underneath the street, with one area incorrectly installed and errors with the subsequent re-plastering along with it.
One wall that faced the outer courtyard area was exempt from certain waterproofing measures as outlined in BS:8102:2009, however we picked up readings in certain areas coupled with substantial visual evidence, the same symptoms with the curved ceiling that formed the base of the stone steps in the street above that drew up to the front door of the building.
From our initial extensive inspection we were lead to establish that, cracks and dilapidation in the solid stone staircase above had enabled water ingress over a long time period.
We were assured from our survey that the property was not at risk of further and serious water ingress and that the structure would prove in every way.
The client wanted remedial action taken in order for a guarantee and so that a sale of property could be swift, we took the action that we deemed to be necessary internally after imploring action be taken on sources of damp externally, in which we could not undertake.
As it was not a matter of flat and clear surfaces, we were restricted in some way to the large abutments and fixtures that were permanent and remained, we agreed to be as less invasive as possible, keeping the dust and mess to a complete minimum.
We installed two products internally, to combat our results laid out in the report:
- Permagard dry-flex membrane on the curved ceiling.
This ensured that there was to be no drill damage in the ceiling and in the structure above, creating any potential for water ingress through the holes. Also allowing a thin barrier that allows a tight coat of plaster, following the contour of the curve.
- 2.5mm Slimline ECO-mesh cavity membrane
This allows the wall behind to breathe and to allow any salts to remain in the plaster, it also allowed us to keep to the pledge of a less invasive and destructive job, without removing any plaster.
Once installed and taped, we undertook the subsequent re-plastering.