A landlord from Sheffield contacted us. Free water had entered the basement at his property in north Sheffield. We noted already in place a cavity drain membrane on the walls and 8mm membrane on the concrete slab.
However the system had failed as a result of a build-up of silt in the channels due in turn to lack of maintenance of the pump.
We carried out remedial treatment which included:
- Removal of the 8mm floor membrane
- Removal of the original perimeter drainage channel, cleaning and reinstalling it
- Cutting a chase on the stairs wall
- Cleaning the lower section of the original 8mm wall membrane
- Cleaning the concrete floor
- Installing new 8mm Newton 508 eco floor membrane over the concrete slab tied into the existing cavity drain wall membrane
- Carrying out a flood test.
Luckily we were able to reuse parts of the waterproofing system already in place once these had been thoroughly cleaned.
Further recommendations:
It is important that any sump/pump system and channel is maintained to avoid similar issues with silt build-up in future.
Our client was delighted with the speed we carried out the repairs and gave us the following feedback:
“Please could you pass on my thanks to Carl and your guys for dropping onto it so quickly and efficiently? A Rolls Royce service!” M. Lomas, Sheffield
8th October 2025
