The house that stayed wet in a drought

A client had chased the same damp for a long time — treatments, fresh paint, and it kept coming back. By the time we were called in, the question had changed from “how do we cover it” to “where is it actually coming from.” The answer was underneath.

The setup

The house sits roughly a metre to a metre and a half below street level, with two pumps running just to manage groundwater. A patch of bare slab by the entry was still damp after a long dry spell. The wide pine floor beside it was water-stained, with one spot of rot nearest the light well — and the light well was packed with loose stone, holding water against the very wall that was wettest inside.

The diagnosis

Damp that persists through dry weather is not coming from the sky. It’s groundwater, pressing up against the underside and edges of the slab and drawn through it by capillary action — worst where the light well and the high external levels feed it. Above ground there was a second story: the veranda was tracking water down its walls, and the rear annex was leaking because a metal roof edge terminated beneath the stone capping and posted rainwater straight down inside the wall instead of throwing it clear.

The approach: cheap and definitive before disruptive

We set out a phased plan rather than reaching for the demolition bar. Deal with the external water first — drain the light well, regrade the levels, intercept the groundwater with a French drain — and run the cheap diagnostic checks in parallel. Only lift the timber floor and investigate the underfloor heating if the slab and boards failed to dry once the supply was cut off. The entire point was to avoid tearing up a floor that, in all likelihood, never needed to come up.

The point

The client had been paying, repeatedly, to hide a problem nobody had actually diagnosed. A treatment without a diagnosis is a guess with an invoice attached — and the water always comes back to prove it. Find the source, cut the source, and the floor often stays where it is. There’s a fuller explanation in where the water actually comes from.

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