To determine if a wall crack indicates subsidence rather than normal settlement or thermal expansion, you must examine its shape, width, and location. Subsidence cracks typically run diagonally at a 45-degree angle, are wider at the top than the bottom, measure greater than three millimeters across, and are visible on both the interior plaster and exterior brickwork. Additionally, subsidence cracks usually go all the way through the wall, widen progressively over time, and are frequently accompanied by secondary symptoms such as jammed doors, sticking windows, or rippling wallpaper unrelated to dampness. Professional surveyors use glass monitor gauges across these cracks to measure whether movement is ongoing.
1 votes
Marked as accepted