Construction World April 2021

PROJECT PROFILE

PRECISE, COST-EFFECTIVE WATERPROOFING Spraylock Africa helped provide a more precise and cost-effective, as well as faster means of waterproofing a total of 18 828 m 2 of concrete slabs for new Deloitte head office in Waterfall City in Midrand. The area covered on this new development included the ground and first floor, as well as the roof.

It eliminates the need for curing membranes, densifiers, floor hardeners and moisture barriers while slabs treated with SCP products can be accessed in as little as an hour and installed with flooring and coating within 14 days. The ability to significantly accelerate the waterproofing process also provides construction cost- savings for the client. Construction innovation technology SCP 327 is applied within 24 hours of placement of the concrete and once the substrate is hard enough to accommodate the application team. Generally, SCP 327 is applied once the power floaters have finished floating the concrete. Working to a strict programme that was determined by the principal contractor, Stormwater Waterproofing Systems’ team treated between 300 m 2 and 400 m 2 of surface in a day. This impressive production rate included preparing the surface ahead of application. The task at hand was an extensive undertaking, starting with 2 817 m 2 of ground floor, followed by the 2 423 m 2 first floor and 8 348 m 2 roof structure. Waterproofing commenced at the end of 2018 and was completed on time and according to quality in mid-2019. Impressively, the same team, which was also trained by SprayLock Africa ahead of the application and received additional support on-site by Sheldon White and a representative of the company’s principal, also treated 17 500 m 2 of concrete slabs at the Illovo Central development in Sandton with SCP products during this period. Illovo Central is another of FWJK’s attractive residential high-rises to grace the Sandton skyline. This exclusive selection of sophisticated residences offers 16 storeys of elevated luxury living. Certainly, coordinating operations between the two project sites was a complex undertaking – a challenge that was exacerbated by many rainy days during the summer season. Time, cost and quality 1. Waterproofing Topical sealers, which include acrylics, epoxies and polyurethanes, form protective barriers on top of the concrete surface. Some of the common issues when applying protective film sealers are surface traffic and proper application. Acrylic and epoxy sealers require

L ocated right on the Allandale interchange of the N1 highway, at the eastern side of this latest growth node in Gauteng, the new premises consolidates Deloitte’s Woodmead and Tshwane offices in a single central location. Consisting of 42 500 m² of workspace to accommodate close to 5 000 employees, the building comprises a ground floor with six storeys of offices and four basement parking levels, including nearly 2 000 parking bays. The more than R1-billion building is co-owned by Johannesburg Stock Exchange-listed Attacq and Atterbury, which was also the project developer. Storm Waterproofing Systems, a leading South African water-proofing contractor, was contracted by the principal building contractor, WBHO, to provide the cutting-edge waterproofing services. The company was awarded the contract based on the high-quality service it supplied to the leading building contractor on previous projects as a specialist waterproofing subcontractor. This is in addition to its longstanding working relationship with other representatives of the professional team, namely Norval Wentzel Steinberg quantity surveyors and Empowered Spaces Architects. Both companies could also attest to the high-quality service that Storm Waterproofing Systems offers. The professional team was introduced to SCP 327 by Carl White, Managing Director of SprayLock Africa, the African representative of the United States-based Spray-lock Concrete Protection (SCP) products. Design innovation SCP products penetrate into the concrete capillary and pore structure after bleed water exits, reacting with free alkali to primarily form additional Calcium Silicate Hydrate (C-S-H) within the concrete. This reaction stops harmful moisture migration within the concrete matrix to acceptable levels for coatings, coverings and flooring. It enhances resistance to chemical and environmental attack; provides permanent protection; increases durability. Notably, the technology also ensures a superior concrete cure as strong as and if not better than 28-day moist curing without delays – another significant benefit on this fast-track project.

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