Damp Walls: What's the Problem? Make sure you determine the cause of the dampness before you try to cure it, otherwise you could be using the wrong remedy altogether. Damp down low. If you have damp patches, bubbling paint, crumbling plaster or powdery deposits on wall surfaces close to the floor, rising damp is probably the culprit. What is Penetrating Damp? Other paths through which rain can cross through a cavity wall include incorrectly positioned wall. It is possible for damp to move within walls but this horizontal movement. Hope you get it sorted. I have a patch in the hall of my place, interior wall adjoining next doors hallway, no brickwork to get wet, no drains, no gutters, no cavity, appears halfway up the wall after rain and has no damp. Damp patch on inside wall after rain. Old houses often have damp problems due to the lack of a damp proof course. A water mark on an internal wall would be a sign of penetrating damp, and can. The damp is in patches is in some. Any tiny leaks from plumbing can be the cause of a large intense damp patch - the leaks. Typically a damp patch will continually appear on a wall after rain. Symptoms appear as localized dampness in linear or patch form or widespread dampness which is highlighted on the lower sections of internal. Rising damp usually occurs in masonry walls because of the failure or absence of a damp- proof course, although poor sub- floor ventilation and bad site drainage can also be contributors. WHAT’S THE REMEDY? Improve the drainage of the site. Make sure the surrounding ground slopes away from the building. Check there’s enough room under the floorboards for moisture to evaporate from the soil below and pass out through sub- floor wall vents. Install a damp- proof course. This job is best left to the professionals. Condensation. If you’re not sure of the cause of a damp patch on a wall, try the foil test. Dry the wall surface with a fan heater, then tape some kitchen foil tightly over the affected area. If the surface of the foil is wet after 2. Condensation occurs when moisture- laden air builds up inside the house. Poor ventilation and over- efficient draughtproofing are often to blame. WHAT’S THE REMEDY? Install extractor fans or vents in kitchens, laundries and bathrooms so that moist air is expelled outside the house before it causes problems inside. Don’t use moisture- producing portable gas heaters to warm cold, damp rooms. Damp patches. Damp patches on walls are generally the result of penetrating damp, where water from outside gets into the brickwork through gaps and cracks. If the patches are clustered around windows and doors, then it’s likely that rain is getting in through gaps around the frames. If the damp is below the opening, it may be because there is no drip groove below a projecting sill. Any other patches of damp are most likely caused by faults in the brickwork, including cracked pointing. WHAT’S THE REMEDY? Keep external walls, including the pointing and the paintwork, in good condition. Seal the gaps around window and door frames. Clear out or cut drip grooves below windowsills. Leaks. Faults in the roof structure, including damaged or missing tiles, poor flashing and broken or cracked gutters and drainpipes, can be the cause of dampness in the house. They’re usually easy to spot, being located either around the ceiling or on sections of wall that line up with the external pipe work. Damp patches may also be the result of leaks in plumbing work embedded in the wall or from poorly sealed bathrooms. WHAT’S THE REMEDY? Repair a faulty roof. Deal with leaky pipes. The brown stain appeared after heavy rain and other small areas are. How To Identify and Treat Penetrating Damp. Penetrating damp normally presents on external walls and forms as isolated patches of dampness which increase in size after periods of heavy rain.
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January 2017
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