The team are currently working on this detached garage below external ground levels in Sheffield. Our client wishes to use this area as habitable space. We have recommended a Type A barrier system for the concrete floor and a Type C cavity drain system for the walls.
So far we have treated the floor involving:
Priming the floor by applying Koster Polysil TG500.
Applying two coats of Koster NB1. This is a mineral waterproof coating that contains crystallising and capillary-plugging agents.
Mixing the Koster VAP I 2000 Part A and Part B with a resin stirrer and apply over substrate
Installing Koster SL Premium Self-Levelling Compound
Internal Bunded System: Involving installing engineering bricks as part of the design at approximately 100mm away from the wall on the retaining walls. A drainage channel will then be installed on the earth-retaining perimeter walls, including jetting eyes and inspection ports, discharging into the existing drainage.
Walls: The cavity drain P8 (8mm) membrane would be mechanically fixed to all walls (floor to ceiling). If insulating in front of the wall membrane a vapour control layer may be required to prevent interstitial condensation and therefore a condensation strip would be required.