Basement Tanking & Waterproofing Explained – What you Need to Know

Many homes in London have basements and underground living space is particularly at risk from damp and mould. London sits on a bed of clay and that means a high level of water retention, which can be a real problem for cellars and basements. In this article, we take an in-depth look at the two main types of basement waterproofing in London, to help homeowners gain a deeper understanding of how to waterproof basements.

Basement tanking

This term describes the process of applying water-resistant render and plaster to the walls and ceilings. The first task is to remove all furniture and other items from the basement, then the damaged plaster must be removed from the walls and the substrate cleaned and left to dry. The next step is to apply waterproof render to the walls, using several coats, allowing each to fully dry before adding another layer. Finally, add a skim of plaster and the ceiling should also be prepared by adding waterproof render and plaster.

Cavity drainage systems

This is the correct method to waterproof a basement where the ground is wet. First, the basement must be emptied, then all damp plaster and render must be removed and the floors, walls and ceilings should be cleaned and prepared for the fitting of the cavity membrane. The membrane sheeting is studded to create a cavity behind the membrane, where water can collect and be channelled to troughs in the floor that lead to a sump, where the water is pumped to designated drainage points. This would also be done on the ceilings to completely isolate the interior and this should leave the interior completely dry.

Independent damp survey

If you have damp issues in your basement, this is a time to book an independent damp survey from London Damp Specialists; one of our certified damp surveyors will carry out a thorough inspection of the basement and the entire building and provide you with a comprehensive report that would include a quote for remedial work that needs to be done. Although we do not undertake damp-proofing work, we work closely with a company that does and they issue a 30-year guarantee on all their work.

Timber rot & woodworm

Timber rot comes in two forms, wet and dry rot, both of which are fungi that thrive in damp and humid environments. This usually leads to timber being eaten away and a musky odour in the space and mould is a health hazard also. Woodworm is a species of beetle (Common Furniture Beetle) that burrows tiny holes into which the female deposits her eggs and when hatched, they start to consume wood pulp.

Basement tanking in London is a busy industry and if you would like your basement surveyed by a reputable company, call London Damp Specialists on 020 7205 4886 or fill in the form on this website and we will be in touch in good time.