Most failures are due to bad design and installation by non-specialist contractors The minimum requirement for a waterproofing specialist is
Unfortunately local authority building inspectors only ask for BBA certification for materials and systems. This does not provide any guarantee that the work will be carried out correctly or give any protection to the client.
Waterproofing is wholly reliant on expert design by the waterproofing contractor and installation by very experienced technicians. Waterproofing is so often carried out by ground workers and builders taking advice from a manufacturers sales personnel, and this is the main reason for failure.
The waterproofing should be designed , from the very start of the process by the waterproofing expert. The waterproofing expert should oversee the installation and guarantee all aspects of the work.
This can only be done by a contractor with a lot of experience in every form of basement construction. MacLennan Designers are among the very few with the necessary experience.