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Damp Proofing

Horizontal line of damp mid-way up across internal wall

Anonymous user 16/03/2024 - 2.32 PM

Hi there, we have found an issue with damp on an internal wall. At the left hand side of the wall it abuts the external wall. The damp area appears across what looks 1 brick course mid-way up the room, the area below is completely dry - and there are some signs of lighter damp directly above. The damp areas is very dark and visible thru the plaster. It stretches the whole width across approx 2m. Looking at the adjoining external brickwork, it appears the mortar is not the same material as the surrounding areas. Could this be siphoning damp into the building along the brick course? The property is late victorian era. Any thoughts are welcome. Thanks Steve

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2 Answers

Western Specialist Surveys Ltd

Rating: 5 out of 5

Weston Super Mare

Hi Steve, Dampness can often migrate mid way up the wall for several reasons however; the most common in a Victorian building (that, presumably is solid construction i.e. no cavity) is due to the bottom half of the wall having been plastered with a dense sand / cement plastering specification (often applied in conjunction with chemical damp proof course injection or, worse, a "tanking" product ). This barrier can force moisture and salts (associated with rising / penetrating ground moisture) into the older weaker plaster. This is usually at approx. 1 to 1.2 m height. Hope this is of help. Terry.

Answered28 July 2020

Anonymous user

Wall tie , probably rusty and caved the water will then track in . Either cut a hole in either the outside or the inside , if it’s not a wall tie it’s a obstruction that needs clearing , if you got cavity insulation get rid of it . Thanks

Answered28 July 2020