One of Alderneys most prestigious family homes Val Des Portes required full refurbishment and general updating.

Having previously used Delta and Delta’s Registered Installer’s Oaks Damp Proofing Limited on previous projects the homeowner was without doubt on calling upon Oaks to ensure a fully BS8102:2009 compliant design.

System components include:
• Delta MS 20
• Delta MS 500
• Delta Cornerstrip
• Delta Qwik-Seal Plugs
• Delta PT
• Koster Repair Mortar Plus
• Koster Polysil TG 500

Delta’s Technical Consultant, Paul Callaghan was approached to give assistance on designing a robust waterproofing solution.
Working in collaboration with the architects, this team of waterproofing experts were easily able to offer a simplistic and practical approach.

Due to the partially retaining nature of the structure, the project required a combination of Type B and C waterproofing systems to ensure a Grade 3 habitable environment.

Phase 1 – Waterproofing existing basement

A ‘Type C’ Waterproofing System was selected as a maintainable waterproofing solution to the existing basement to ensure a Grade 3 habitable environment is achieved.

In principle a cavity drain membrane system allows moisture or running water to travel behind the membrane within a controlled drainage system. A cavity drain system requires minimal preparation and disturbance to an existing substrate.

Phase 2 – Retrofit extension to existing basement

Type C waterproofing systems being the most reliable and maintainable approach to the project was again incorporated into the BS8102:2009 structural waterproof design.

Prior to the installation of the Type C System. All construction joints were sealed using Koster Repair Mortar Plus.

Oaks applied as a closed layer of Koster NB 1 sealing slurry to stop migratory dampness rising from the columns.

Koster NB 1 develops an intense bond to the substrate to which it is applied, sealing capillaries to ensure the structure is fully ‘locked down’.

Before installation of the Delta Type C membranes, all new concrete was treated with Koster Polysil TG 500 anti-lime inhibiter to seal the surfaces and reduce the leaching of ‘free lime’ which could cause blockages behind the membranes.

Oaks added Delta PT, as a suitable damp proofing base to the retaining wall of the garage which was to be rendered.

All floors and drainage elements were tested to ensure these would drain as the system was designed and BS 8102:2009 requirements were met.