Replacement of the car park slab with a new waterproof concrete slab. Waterproofing of the existing concrete walls to upgrade from a Grade 2 to Grade 3 (BS 8102:2009) habitable environment.

The waterproofing challenge

Originally designed and constructed as a basement car park for the offices above, the building was renovated and converted in to a luxury hotel.

The car park became a habitable space which included the catering facilities and associated kitchen storage. Therefore, a waterproofing solution was required for both the remaining concrete walls and for a new replacement concrete slab.

The Xypex solution

Xypex utilises the same technology, whether it is applied as an admix in new concrete, as well as a coating to existing concrete of any age. This makes it possible for seamless waterproofing between new build and existing retrospectively waterproofed concrete.

Xypex Admix was used in 135m3 of new concrete. Over 300m2 of existing concrete was coated with Xypex Concentrate.

Xypex Admix C Series – New slab.

Xypex Concentrate – All joints, including between the new slab and the existing concrete. All existing external concrete walls of the basement.

Hydroswell Bentostrip – All construction joints and all joints between the new concrete slab and the existing concrete walls.

The results

The minimum level of performance Xypex achieves is Grade 3 (BS 8102:2009). Likewise, this applies whether utilised as an admix or as a concentrate slurry coat.

The use of Xypex on this project ensured the required level of protection was reached. Furthermore, all waterproofing across the project could be covered under a single warranty.



Project thumbnail


  • New build
  • Refurbishment


  • Glasgow, Scotland


  • Admix
  • Concentrate
  • Hydroswell Bentostrip