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Damp Proofing

Do I need to tank a basement which is already dry and well ventilated?

Anonymous user 09/03/2024 - 2.37 PM

Hi. I'm renovating a house and am planning to convert the basement into a habitable space. The basement is totally dry even after a storm (very good natural drainage, on high ground). In addition it's very well ventilated as an atrium starts at the basement floor and runs all the way to the roof. I'll be installing a steel staircase in the atrium with a minimalist design to reduce the volume it takes up and avoid inhibiting the airflow too much. I also plan to fit underfloor heating throughout the house, including the basement. Given all of this, will it still be necessary to tank the concrete block basement walls or fit a membrane? Should I leave a cavity between the basement walls and internal insulation? I was thinking of using steel batons to be safe.

Are you a tradesperson and able to answer this question?

1 Answer

LABS Building Services LTD

Rating: 5 out of 5

Sheffield

Hi there, in line with BS86102 standard industry practice is to follow the graded end use of the basement as it varies from storage to habitable space. One of the principles is that any design must assume water will pass during its life course, water tables change overtime, and then there is always the risk of drainage failure. The National House Building Council (NHBC) in order to get warranties for new builds with basements insist upon two methods of protection and that an individual suitably qualifiedwith specialist training in structural waterproofing must sign off the design. Obviously this will differ for you, however I think its wise to consider the financial implications if you were to sell your house. One of the first question to be asked, would be what type of water proofing system is installed. Personally I'd recommend a cavity drain system with a pump. You can get more information on the Property Care Associations website. The PCA is the leading trade body who provide training in structural watrprooofing. I would be happy to assist if you have any further questions.

Answered17 February 2017