Richmond Building is the largest building on the University of Bradford city campus and is highly visible across the Bradford district. With 33,000 square meters of accommodation and 14 story’s high, the building was reclad to the western elevation in 2006 massively improving its energy efficiency. The building has seen many changes since its erection in the 1960s, not least the installation of a translucent roofed atrium providing a thriving social hub at the heart of city campus. The building houses offices, teaching space and specialist laboratories. But it was the Richmond Wing north roof that was in need of refurbishment when Sika was called in to assess the area in July this year, as an IT training room which naturally houses computer equipment, as well as being in regular use by students, had a failing roof. The initial inspection revealed the original roof had a concrete deck, bituminous based vapor control layer, 90mm insulation with a three layer felt system finished with a mineral cap sheet, but it was in need of serious refurbishment. A core sample, taken during the initial inspection indicated saturation of the original roof build-up above the structural deck and there was ponding in places, which increased the likelihood of water ingress via defects in the existing waterproofing. In addition short-term repairs had been made and needed further investigating as did the cause of the blistering which was evident in the existing waterproofing.
SIKA LIQUID PLASTICS SOLUTION
Sika Liquid Plastics recommended that the existing roof be completely removed and stripped back to the concrete deck, first installing a vapor control layer of S-Vap® 5000E SA , followed by Decotherm® insulation and bonded in Decostick SP adhesive primed with Primer 600 and with ® Carrier Membrane SA . The build-up was then capped off with a Decothane Ultra System, a liquid applied membrane, which provides a totally seamless waterproof finish. As part of the works, further attention to the detailing items were essential as there were a number of plinths, protrusions and plant equipment which were failing. To finish, as there were designated fire escapes and maintenance routes, it was agreed to install a walkway using the new Deco Mineralized Grit system in a contrasting color, which is a visual benefit to all users, providing an easily identifiable pathway. The liquid applied membrane was Decothane Ultra, a new low odor waterproof roofing membrane recently launched onto the UK market. As the building would be occupied during the works, any product that cut down on possible complaints was essential and Decothane Ultra was designed specifically for use in more sensitive areas such as hospitals, food manufacturing and educational facilities such as this. With its low odor levels, Decothane Ultra is a non-disruptive roofing solution that achieves more than 80 percent reduction in odour strength five minutes after application and greater than 95 percent reduction after just one hour against a similar one-component competitor. With a growing number of refurbishment projects that need to be completed when the building is still occupied and smell has been a cause for complaints in such locations this new product has a significant advantage over competitor products.
Decothane Ultra utilises a range of new novel curing agents developed and patented by Sika. This new chemistry offers a versatile platform from which to formulate extremely low solvent content and to low odor liquid applied membranes for a wide range of applications.
The finished project has provided the client with a waterproof system which has taken into account all the on-site restrictions and detailing needs. There is also the added benefit of Decothane Ultra, a low odor
product that also met the client’s requirements. The project ran