For a £117 million shopping centre in Newport, a comprehensive range of waterproofing solutions from Sika has provided unrivalled waterproofing protection ensuring this major retail development is watertight and remains on track for completion.
The Friars Walk Shopping Centre in Newport was built by Bowmer and Kirkland Ltd for Queensberry Real Estate.
For the expansive lower area of the building, engineers Waterman Consultants required a robust and durable waterproofing solution that could meet both Grade 3 of BS 8102:2009 and BS 8485 codes whilst at the same time being flexible for the different site details.
To meet the requirements, the specification comprised a dual system of more than 9000 m2 of the Sikaproof A08 system, a totally new concept in membrane barrier design, together with 3300 m3 of Sika® Watertight Concrete to deliver outstanding levels of watertightness to the lower floor.
The membrane surface of SikaProof A is embossed with a grid pattern, which contains a sealant, and is topped by a thin layer of fleece which forms a mechanical bond to the concrete when it dries. The grid pattern is also unique. It offers additional protection, due to the integrated sealant, which bonds tightly with the surface of the concrete, forming mini watertight compartments.
Therefore, even if the membrane is damaged or pierced, moisture or pressured water cannot spread between the membrane and the concrete structure as it is contained within the small damaged grid square.
Sika Watertight Concrete, which was supplied by Lafarge Tarmac to Churngold Construction, is a high quality solution for below ground and basement construction that prevents water from migrating through the concrete. Sika admixtures work within the concrete, firstly to reduce the water/cement ratio, thus increasing the density of the mix and minimising the size, volume and continuity of the concrete's pores, and secondly, fill the remaining pores.
James Rivers, Churngold Construction, commented: “These are great waterproofing systems which were sold very well to the design team through an outstanding technical detailing ability. I cannot speak highly enough of the team at Sika.”
To complete the system, construction joints were sealed with the SikaSwell jointing system.
The Sika Watertight Concrete system complies with BS 8102:2009 Grade 3 for habitable areas where no water penetration is acceptable, an essential consideration for the basement area. The system also complies with BS 8485 which ensures the membranes, including the joints, restrict the ingress of hazardous ground gases into the building.
Edited from press release by Angharad Lock
Read the article online at: https://www.worldcement.com/europe-cis/07062016/sika-waterproofs-newport-3473/