This new build project is located on the site of an old car maintenance garage, 4 new build developments including basement areas are planned to be built on the site. Due to ground contamination from previous ground gasses, Renlon provided a waterproofing design strategy incorporating MemTech Liquid Gas Membrane.
MemTech LGB is a ready for use specialist styrene butadiene latex based liquid applied gas membrane. It offers a simple, continuous passive gas prevention barrier against the ingress of Methane, Carbon Dioxide, Radon, Ground Gas, VOC, air & moisture into buildings.
A 2 coat application providing a minimum dry coated thickness of 1.0mm is required to provide a suitable gas barrier.
The project also included the installation of a Type ‘A’ cavity membrane system and Type ‘B’ waterproof concrete in accordance with bs8102:2009 requirements.
Methodology
Phase 1
A Koster Polysil TG 500 priming coat was applied to the new concrete slab to reduce the risk of excess free lime leaching out during the curing process followed by 2 applications of MemTech Pro Liquid Gas Barrier “LGB” to the floors and walls of the basement to seal the entire underside of the building.
In advance of the Delta waterproofing system being installed, the drainage channel area (perimeter channels) was reinforced with MemTech Flexi Tape.
MemTech LGB complies with the latest codes of practice as published by BR211, CIRIA and BSI (BS 8485:2015+A1:2019). Suitable for use as gas protection for NHBC GREEN, AMBER 1, and AMBER 2 site characterisations.
Prior to the installation of the Type C Cavity Drainage System, the installation of the ground gas membrane was tested and verified. The technician attending site to verify the gas membranes was incredibly impressed with Renlon’s specification and installation.
Phase 2
The Type C system comprised BBA certified Delta MS 20 cavity drain membrane to the floor and BBA certified MS 500 cavity drain membrane to the walls. Perimeter channels which had previously been treated with MemTech LGB and MemTech Flexi Tape to house Delta’s Channel drainage conduit. Channel drainage conduit diverts any water entering behind or beneath the membranes. To allow for maintenance of the system, access ports were installed to the Delta Channel every 10 linear metres.