Damp patches inside a rendered house in Elm Park? How cracked or failing render lets water in, how to tell it from condensation, and how it is put right.
Damp patches on the inside of an outside wall, in a rendered house, are often caused by the render itself. Render is meant to shed rain, but once it cracks, blows or loses its seal around windows, water gets behind it and is held against the brickwork. The wall stays wet, and the damp shows inside as stains, peeling paint or cold patches.
Elm Park was built in the 1930s as one planned estate, and many of its semis and terraces were rendered or pebbledashed from new or soon after. Render that is the best part of a century old, patched over the years with harder cement mixes, often cracks where the patches meet the original. Cracks around window sills, at the base of bay windows and along the line of the damp proof course are the classic places.
Not every damp patch is the render. Condensation shows as black mould in corners and behind furniture, worst in winter. Rising damp shows as a tide mark low on the wall. Penetrating damp from failed render tends to follow weather, appear on the side facing the prevailing wind, and line up with visible cracks outside.
The fix depends on the extent. Local cracks can be cut out and repaired. Render that sounds hollow when tapped has lost its bond and needs removing. Where large areas have failed, stripping and re-rendering with a breathable modern render is the long-term answer.
Yes. Water gets behind the render through cracks and is held against the wall, then shows inside.
Condensation shows as mould in corners and behind furniture. Render damp follows rain and lines up with cracks outside.
If it sounds hollow when tapped, it has come away from the wall and needs to be removed and replaced.
Small, local cracks yes. Widespread cracking or hollow areas need a bigger repair.
Yes, the whole estate and the roads around Elm Park station, Hornchurch and Rainham.
A typical semi takes around one to two weeks, depending on the weather and how much is stripped.
Cracks, blown patches and failed seals around windows hold water against the brick.
Old render patched with harder mixes cracks where patch meets original.
Window sills, bay window bases and the line of the damp proof course.
Penetrating damp follows the weather and lines up with cracks outside.
Cracks cut out and repaired to match the existing finish.
Stripped and re-rendered with a breathable system where large areas have failed.
Send a photo or a quick video of the room on WhatsApp. Or ask for a free fixed quote with no obligation. We will tell you straight what it needs.