You have seen it on your walls. Probably wondered what in the world was whitish and sometimes blackish stuff growing on them. You obviously did not like it but chose to ignore it anyway. This article by Tom Muriuki from Mau West Waterproofing Solutions will make you rethink that.

Mould is very problematic to most homeowners. When presented with the right conditions, it can grow literally anywhere in the house as long as the surface is wet or damp. This includes behind walls, under your carpet, etc. When excessive moisture accumulates in buildings or homes, mould growth will often occur, particularly if the moisture problem remains unaddressed.

Mould Growth on Walls

Mould Growth on Walls

Mould growth should be avoided at all costs because it has the potential to cause serious health concerns. Frequent exposure to mould may cause allergic reactions to individuals, especially infants. Individuals allergic to mould can develop asthma attacks. Allergic responses to sensitive individuals include sneezing, runny nose, red eyes and skin rash.


How do you get rid of mould? The first and vital step is to fix any water problems within the house or building. mould will not grow if moisture is not present. Therefore, the presence of mould could indicate a water problem. Water problems can be as a result of rising damp, leaky window frames, seepage of water through cracks and porous surfaces on the walls and floor, plumbing leaks and other water problems. Additional tips include checking if roof gutters are leaking and cleaning them regularly, increasing ventilation and frequent cleaning of wet areas (usually bathrooms and kitchens).


Signs of a damp wall

What Is Rising Damp?

Rising damp in buildings occurs when water from the ground rises up through the stone, block or brick wall and sometimes through the concrete floor slab by a process termed as capillarity. In simpler words, water rises up the walls of a building in the same way oil rises up through a wick of a lamp.

As seen in the pictures above, rising damp causes efflorescence (i.e white powdery deposit on the surface of the wall), peeling paint, destruction of wall finishes, mould growth and musty smell in the rooms with damp walls.

Rising damp on a wall

Rising damp on a wall

Rising damp is caused by poor construction methods, use of porous materials and destruction (or lack) of the damp proof course (commonly referred to as DPC)

The DPC is an impervious membrane, usually made of bitumen, that is placed between the wall and the floor slab to prevent dampness from the foundation wall from climbing up to the building wall by capillarity. The DPC is placed during construction of the structure.

So, how do you deal with rising damp?

Damp walls can be made dry by treating them with PENETRON CAPILLARY CONCRETE WATERPROOFING SYSTEM.  The common materials that use this system to treat a wall with rising damp are PENETRON SLURRY, PENETRON ADMIX and PENECRETE MORTAR.

It is important to consult a qualified waterproofing contractor when dealing with rising damp. This will ensure that the right materials are used and that the issue is resolved permanently.

Do you have any questions or comments regarding leakages, water damage or waterproofing in your house or building? Reach out to us for help.


About Mau West Co. Ltd

Mau West Company Ltd was registered in 1981. The company started carrying out construction and waterproofing works in 1986. They specialise in waterproofing works and they are registered with National Construction Authority under Civil Engineering – Waterworks Contractors Category NCA5.

Mau West Company Ltd provides a variety of waterproofing systems to cater for different client needs, by harnessing the immense benefits of the latest technology in waterproofing using world class products.