Commercial

1–9 Seymour Street

Basement Waterproofing
When it came to replacing an old police station with a new multi-purpose space, it was vital to ensure the basement was correctly waterproofed. Due to our extensive experience, we were approached to design the structural waterproofing system for 1–9 Seymour Street’s basement, making sure that it would be safe and dry for years to come.

The Project

Following the closure of the Marylebone Police Station, Westminster County Council gave permission for the existing building at 1–9 Seymour Street to be demolished and for a brand-new development to take place. Within this ambitious £60 million project, the developers wanted to construct a seven-storey mixed use building, including a two-level basement, residential block, restaurant, retail space, commercial office block and school.

Working with Galliford Try and Delta Membrane Systems, we knew that a basement waterproofing project like this would require a pragmatic approach. Tim Herbert, our managing director and CSSW qualified structural waterproofing surveyor, was involved at the design phase to provide his expertise from the start, ensuring the basement would be designed correctly to prevent any water ingress.

The Challenges

  • Ensuring a fully functional waterproofed basement for a variety of uses
  • Making sure all construction joints were appropriately waterproofed
  • Operating in a complex inner city environment with significant delivery challenges

Our Approach

We gave careful consideration to the products available and the approach taken. With over 5,000 square metres to cover, we used a Koster Nb1 crystallising mineral waterproofing slurry system, which was ideal for new construction due to its excellent resistance to pressure and abrasion. We then used a Delta MS500 and MS20 cavity drain membranes to waterproof the walls and floors. The design methodology had to be completely compliant with BS8102:2009 and NHBC Chapter 5.4.

Our Approach

We gave careful consideration to the products available and the approach taken. With over 5,000 square metres to cover, we used a Koster Nb1 crystallising mineral waterproofing slurry system, which was ideal for new construction due to its excellent resistance to pressure and abrasion. We then used a Delta MS500 and MS20 cavity drain membranes to waterproof the walls and floors. The design methodology had to be completely compliant with BS8102:2009 and NHBC Chapter 5.4.

The Result

Our approach meant that the multi-level basements would prevent any future water ingress through the life of the building. Galliford Try were thrilled with the outcome, and we completed the project on time and within budget.

The Result

Our approach meant that the multi-level basements would prevent any future water ingress through the life of the building. Galliford Try were thrilled with the outcome, and we completed the project on time and within budget.

Customer Insights

Working with Guardian has been an efficient process from start to finish. Throughout the project, the workmanship was of a very high standard and they engaged with the other contractors seamlessly. We would be happy to recommend Guardian and look forward to working with them in the future.

Galliford Try

Project Manager

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