Severe Service Penetration Flooding Fixed by Trace
Built on a low lying site which collected water following heavy rainfall.
Clay ground encouraging water to perch and pressure on the basement structure.
Land drainage installed in an attempt to relieve pressure on structure, but too high and ineffective (unreliable outlet which backed up).
Concrete structure tanked externally (bitumen sheet membrane) and internally with slurry as a remedial measure, both systems by builder, both failed.
We were initislly advised that problems with service penetrations (pipes/cables running through basement walls) had been addressed, but these turned out to be the main cause of trouble in the basement.
Main contractor went bump leaving homeowners to resolve.
Others had been invited to price for remedial works, and were wandering around when I arrived, I understand they that advised that they could address it all without really explaining how.
What we understand is that where issues are complex and multiple, you’ll struggle to digest all the information on the spot and come up with the solution there and then. If you do you risk missing something. Key in the design process is to collect the information, undertake a desk study and then THINK through the design. From homeowner comments, this was a noted difference between Trace and others.
Irrespective, we advised that it would be unlikely that we could completely seal the service penetrations, as others had already tried and they were a mess of different materials. We proposed to install cavity drainage waterproofing internally, to collect and remove penetrating water using pumps, channels and cavity membrane.
The next thing is, we’ve started work and overnight there substantial rainfall and the homeowners contact me at 6:45am in the morning stating that the basement is flooding, so we dash over there and water is absolutely pouring out of the service penetrations, and there is essentially a moat around the property, meaning that the remedial land drains are doing nothing.