Delta Membranes

Delta product range showcased in Streatham case study

  • 21 Jul 2020

512/522 Streatham High Road is a new mixed-use development of storage and office space, which features a plethora of products from Delta Membranes.

Delta’s Director, David J. Symes, was delighted to have been involved with this prestigious project from concept, which involved a basement with a footprint of an impressive 1500 square metres (wall surface) and 2500 square metres (floor surface).

Harmonix were appointed main contractor to create a five-storey structure, which included a two-storey basement. Initially, the area was excavated to approximately 13,700m cubic metres, using contiguous piling to form two basement levels.

A new structural concrete slab was laid with three lift pits, with the piles having then been faced with a concrete lining wall. 

The project required a robust and a meticulously detailed specification with Delta Registered Installers, Cemplas being appointed waterproofing contractor to guarantee a watertight basement.

The project requirement was for two forms of waterproofing which consisted of a Type B watertight concrete and Type C Cavity Drainage Membrane System which would meet all criteria of BS8102:2009 (Code of Practice for Protection of Below Ground Structures against Water from the Ground) and to provide a Grade 3 habitable environment.

Delta Membranes

Methodology

When designing a robust waterproofing solution, attention to detail is critical.  The waterproofing design for any new build below ground structure should always be carried out by a CSSW (Certified Surveyor in Structural Waterproofing) or equally qualified surveyor. 

When specifying a Type C cavity drainage membrane system, full consideration must be given to the drainage aspect, when installed below ground.  

Before the installation of the Type C System, the lift pits and piling cap were encapsulated with Koster NB1 waterproof slurry. Koster NB1 active migratory crystalline slurry was applied over the capping beam and taken across the underside of the ground floor soffit to provide protection against the expectation of lateral capillary movement and down the front face of the concrete lining wall.

To reduce the risk of free lime leaching out of new concrete during the curing process, Koster Polysil TG 500 was applied to the face of the concrete lining wall.

After ensuring the structure was watertight, Delta MS 500 Cavity drain membrane was installed to the walls and applied to the face of the concrete lining wall.

Delta Membranes

Cavity Drainage Systems manage water penetration, Delta drainage channel, a water collection conduit designed to control water ingress was bedded into a preformed recess/gully at the floor/wall junction with incorporated inspection and maintenance points to comply with BS8102:2009.

Prior to the application of approx. 2500 square metres of Delta MS20 membrane the basement slab was thoroughly flood tested which extended to the vertical cavity drain membrane and results recorded on the Delta/Cemplas site monitoring forms to ensure the free passage of water had unhindered access to the sumps.

This is an important part of the testing where installing Type C systems and ensures that any debris behind the system is fully flushed away preventing issues in the future and designing out risk.

Locations of the sump pump units were suggested during the design phase. By incorporating sump pumps at the design stage, it allowed for project team to work together to create and share a range of project documentation with the benefit of interconnectivity which in turn created better project decisions during the correct stages of the project.  

Delta Membranes

Products

 – Delta MS 20
 – Delta MS 500
 – Koster Polysil TG 500
 – Koster NB1

Case Study Results

The project successful reflects the relationship between Delta and Cemplas.  Highly accomplished project performance from concept with complete customer satisfaction. 

Cemplas have created a completely dry and habitable Grade 3 environment two-storey basement which fully complies with all criteria set in BS 8102:2009. 

Delta described it as ‘a pleasure’ to work with Cemplas and that it looks forward to the next project.

Delta Membrane Systems,
Delta House,
Merlin Way,
North Weald,
Epping,
Essex,
CM16 6HR
United Kingdom

Visit Delta Membrane Systems' website

Leave a Reply

Latest news

SFS

SFS: Adjustable fasteners, heat induction innovations, and a case in the North East

The fastening solutions roofing installers and contractors choose can make a lot of difference post-COVID, explains Martyn Holloway, Business Development Manager – Flat Roof at SFS.

Posted in Articles, Building Industry News, Building Products & Structures, Building Services, Building Systems, Case Studies, Innovations & New Products, Restoration & Refurbishment, Retrofit & Renovation, Roofs, Sustainability & Energy Efficiency

ADSA

ADSA Proudly Sponsors Prestigious Industry Award

The Automatic Door Suppliers Association (ADSA) is sponsoring a prestigious award highlighting the best in electronic product design and innovation at the AI Specification Awards 2022.

Posted in Architectural Ironmongery, Articles, Awards, Building Associations & Institutes, Building Industry Events, Building Industry News, Building Products & Structures, Doors, Information Technology, Innovations & New Products, Posts, Security and Fire Protection

SFS

SFS: Why thermal efficiency is particularly important in high rise buildings

Simon Fielden, Sales Director at SFS UK, explores the role of the building envelope in increasing thermal resistance and reducing energy consumption.

Posted in Articles, Building Industry News, Building Products & Structures, Building Services, Building Systems, Cladding, Facades, Restoration & Refurbishment, Sustainability & Energy Efficiency, Walls

Delta

Delta: Remedial Basement Waterproofing to commercial structure

Delta Membranes’ Managing Director, Kevin Dodds was approached to offer advice and guidance on a failed waterproofing system. This article explores that more…

Posted in Articles, Building Industry News, Building Products & Structures, Building Services, Case Studies, Damp & Waterproofing, Facility Management & Building Services, Membranes, Posts, Restoration & Refurbishment, Retrofit & Renovation, Walls