![]() Random damp patches to any elevation on the walls and ceilings.Wet and/or rotting skirting boards are quite often exhibiting corroding nails.Depending on severity: Wet surface or droplets trickling on the surface.Damp patches that grow if the water continues to enter, especially during heavy rain.Discolouration of the interior decoration with the presence of tide marks.These damp patches may appear as shadows on the wall or cause the paint to bubble up and crack. The consequence is that the rainwater cannot efficiently run away from the walls, causing dampness to seep through. Penetrating damp may take place where there is a defect in the roof, render, brickwork, clogged or damaged gutters or downpipes and window frames that allow for water to enter the building materials.Ĭommonly, penetrating damp occurs on external walls where the external ground levels are higher than the internal floors or there is an incorrect fall away from the building. In lack of impermeable insulation in the wall cavity, the moisture held in the cavity wall insulation will gradually travel to the inside wall pushing dampness through the plaster coat, paint or wallpaper. Penetrative damp can affect at any level of a building, predominately areas that are exposed to severe weather conditions. The dampness form isolated patches on walls that typically increase in size after a storm. Penetrating damp (or lateral damp) is usually caused by water entering the exterior envelope of the building. Summertime brings us heavy rainfalls, sometimes combined with driving winds that push rain and moisture through the brickwork or masonry. Storing large amounts of water-absorbent materials, such as books or cardboard boxes, in a damp space.Use of clothes drying racks and heaters without adequate ventilation.Showering, cooking and boiling without adequate ventilation (exhaust fans/open windows).Rain leaking in through the roof or walls.Surface water leaking into the building.It is worth noting that damp patches and/or mould are not always visible and you may have hidden mould and/or damp: penetrating or rising) or be generated indoors (i.e. The key component for mould growth is excess moisture. This is why penetrating damp and condensation can be mistaken for rising damp or vice versa.ĭamp walls also encourage mould growth, which can lead to health problems for occupants. Many of the visual signs of the three main categories of dampness in buildings may look quite similar to the untrained eye. When the diagnosis is wrong, the treatment fails and the damp issue remains. In this blog article, you will find what signs to look for, what type of damp problem they may represent and how they can be treated and repaired.ĭiagnosing the cause of dampness in a building is vital so that correct treatment and repair can be carried out to address the source of the problem. However, a high proportion of damp problems in buildings are caused by rain penetration, condensation or rising damp. There are many causes of excess moisture in the structure of a building, such as leaking pipes and damage to gutters and roofs. DAMP PATCHES ON WALLS AFTER RAIN – WHAT COULD IT BE? What causes damp in internal walls and what are the signs of penetrating damp, condensation and rising damp to look out for?Īfter a day or more of heavy rain, we hear from a great number of homeowners and facility & asset managers that they have noticed damp patches on the walls.
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