Sector Housing, private
Project type Refurbishment
Services provided Planning advice
Product / system manufacture
Product / system supply
Year completed 2020
Project location South West England
Client Private client
Contractor Oaks Damp Proofing Limited
Products used MS 20 • MS 500 • PT • NB1 • Repair Mortar Plus • Polysil TG 500
 
 

Context

Val Des Portes, a substantial 4 floor Georgian house in Alderney, was built around 1790 and required full refurbishment and general updating.

This historic property required a robust waterproofing solution for fail-safe protection and the existing basement was also being extended by 600m2.

Delta Membrane as Structural Waterproofing Designers worked alongside the architect, project manager and contractor for a smoother process and provided a fully BS8102:2009 compliant design.

All structural waterproofing materials were sent by boat!

Project details

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

The project was split into 2 phases. Phase 1, waterproofing the exiting basement and Phase 2, retrofit extension to the existing basement to create a luxurious multiuse living area.

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 is a great product as it 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.

Products Used
• MS 20
• MS 500
• PT
• NB1
• Repair Mortar Plus
• Polysil TG 500

Case study results

Delta Registered Installers, Oaks Damp Proofing Limited delivered another great install with ease in the agreed time frame and to budget. The property’s delighted owner is offered reassurance that her basement is fully protected against the long-term threat of water and damp ingress.


Context

Val Des Portes, a substantial 4 floor Georgian house in Alderney, was built around 1790 and required full refurbishment and general updating.

This historic property required a robust waterproofing solution for fail-safe protection and the existing basement was also being extended by 600m2.

Delta Membrane as Structural Waterproofing Designers worked alongside the architect, project manager and contractor for a smoother process and provided a fully BS8102:2009 compliant design.

All structural waterproofing materials were sent by boat!

Project details

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

The project was split into 2 phases. Phase 1, waterproofing the exiting basement and Phase 2, retrofit extension to the existing basement to create a luxurious multiuse living area.

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 is a great product as it 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.

Products Used
• MS 20
• MS 500
• PT
• NB1
• Repair Mortar Plus
• Polysil TG 500

Case study results

Delta Registered Installers, Oaks Damp Proofing Limited delivered another great install with ease in the agreed time frame and to budget. The property’s delighted owner is offered reassurance that her basement is fully protected against the long-term threat of water and damp ingress.


 
 
 
Downloads
  • DELTA® MS 20
    DELTA® MS 20
    2pp 1.62MB
    Download
  • DELTA® MS 500 product data sheet
    DELTA® MS 500 product data sheet
    9pp 755.52KB
    Download
  • KÖSTER NB 1 Grey
    KÖSTER NB 1 Grey
    4pp 691.81KB
    Download
  • DELTA® PT/Lath/Slimline product data sheet
    DELTA® PT/Lath/Slimline product data sheet
    6pp 1.05MB
    Download
 
 
 
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Delta Membrane Systems Ltd
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Merlin Way
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Tel: 01992 523523
Fax: 01992 523250
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Robust waterproofing solution for historic property