What Causes Rising Damp on Internal Walls?

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What causes rising damp on internal walls? The process in which water ascends through plaster on an internal wall is called capillary action. This phenomenon is caused by dissolved salts in groundwater, which form a floury crust on the surface of the wall. These dissolved salts are harmless and do not damage the wall material, but they draw in moisture from the air and cause the damp to continue to grow.

What Are The Common Signs Of Rising Damp In Your House?

When you first notice signs of rising damp, you’ll likely notice tide marks on your internal walls. This occurs when the water rises through the plaster. The damp can be quite difficult to spot, but it’s usually evident once you notice the water accumulating on your walls. Usually, the marks will be visible up to a metre above the skirting board, and may extend further. However, if you notice a stain on the wall, this is a symptom of another condition, so it’s vital that you seek professional advice if you suspect rising-damp damage.

Rising damp is a problem that begins at the bottom of your internal walls and moves upward because of the porous materials in the ground floor. This over-moist ground floor material absorbs water, causing the damp to rise. When the damp continues to rise, it will eventually affect the structure of the timber structures, encouraging the growth of mould and other fungi. In addition, rising-dampness can also lead to foundation decay and a foul odor.

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