Damp Proofing Battersea

Battersea runs along the south bank of the Thames from Nine Elms to the edge of Wandsworth, and inland to Clapham Junction and the streets between Clapham Common and Wandsworth Common. Before it was built over in the nineteenth century, much of the land near the river was marsh and market garden, crossed by streams making their way to the Thames.

Near the river and around Battersea Park, buildings stand on alluvium and terrace gravels with the water table not far below. Further south the gravels thin out over London Clay. The Falcon Brook, now a culverted sewer, once ran north through Battersea to the river, and lower lying streets along its old course still tend to have wetter ground.

The housing is a real mix. There are Victorian terraces between the Commons and around Northcote Road, the small cottage terraces of the Shaftesbury Park estate built in the 1870s, red brick mansion blocks along Prince of Wales Drive and around the park, and large new developments at Nine Elms and the Power Station.

The older terraces and the Shaftesbury Park cottages have solid brick walls, shallow foundations and suspended timber ground floors. Rising damp, bridged damp proof courses and damp floor voids are common, particularly where front gardens have been paved over or ground levels have crept up against the walls over the decades.

Damp left in those floor voids is a common route to wet rot in joists and skirtings, and occasionally dry rot. Blocked air bricks, sleeper walls with no damp proof course and leaking pipes under the floor all play a part, so we lift a board or use an inspection camera where needed to check the timbers rather than guessing from the surface.

In the mansion blocks, damp often comes from above or the side rather than from the ground. Failing parapet gutters, downpipes buried inside walls and cracked render on exposed elevations let water in, and it can travel some distance before it shows. Lower ground flats in these blocks can also be affected by ground moisture.

Basement conversions are popular in Battersea family houses. With the water table high close to the river, a conversion needs a properly designed waterproofing system, usually a cavity drain membrane with a sump and pump, built to BS 8102:2022 and sized for the wettest part of the year rather than the day of the survey.

In the newer riverside apartments, the damp we see is mostly condensation and mould. Airtight construction, large glazed areas and limited extraction lead to high humidity, especially in bedrooms and around window frames. The fix is better ventilation and humidity control, not damp proofing.

Many Battersea homes are flats in converted houses or blocks, where the cause of damp can sit in a shared wall, roof or drain. Our reports are clear enough to pass to a managing agent, freeholder or neighbour, showing where the water is coming from and which repairs belong to whom.

Because the cause varies so much from street to street, the survey comes first. Our CSSW and CSRT trained surveyors take moisture readings, use thermal imaging where it helps, and check drainage, pointing, ground levels and ventilation before recommending anything. You get a written report with photos that explains the cause in plain language and sets out the fix, with no obligation.

We cover SW11 and the neighbouring parts of SW8 and SW18, including Battersea Park, Clapham Junction, Northcote Road, Shaftesbury Park, Queenstown Road and Nine Elms. Surveys are arranged from our London office at 45 Fitzroy Street.