Product / system manufacture
Product / system supply
Delta System MS500 cavitydrainage membranes, tapes and fixings • Delta Drainage Channels • Delta System V3 sump and pump • Delta System FM cavity drainage membrane
An historic stone cottage in Oxfordshire suffered from periodic flooding due to rainwater bearing against the external stone wall as external roads are higher than the kitchen floor.
Delta Membrane Systems provided a complete service for the project including CSSW qualified specialists for design advice, a full range of structural waterproofing products, and a network or Delta registered installers.
Given the high external ground levels, ineffective soakaway drainage would still leave the sub soil saturated at times of flood. An external barrier solution was not considered effective so the solution was to tackle the problem from the inside.
A Type C drained protection solution is common in structural waterproofing schemes where external ground levels are high and there is a likelihood of water in the ground. The main components of the system are the cavity drainage membranes. These are sheets manufactured from virgin HDPE which are extruded into studs which come in various depths; an 8mm membrane was used in this project.
With the floor finishes and kitchen units removed, a mininimum 50mm deep x 100mm wide channel chase was cut at the wall and floor joint draining to a Delta Single V3 sump and pump unit. The chase was bunded.
The inner face of the existing wall was then lined using Delta MS500 cavity drainage membrane fixed using sealed Delta Plugs. The whole of the existing kitchen slab was lined over using 3mm profile Delta FM membrane (which is designed as an underlay for protecting oak floors). The two membranes were joined by use of a wide profile DPC.
Externally, Delta Koster Façade cream was applied along the base of the wall to increase the water-repellent properties of the wall.
The work undertaken has produced a comprehensive and long-term solution for this intermittent flooding problem.
The BS85500:2015 Flood Resistant and Resilient solution can be used by the homeowner to reclaim the true market value of the property.