Polyroof were the proud winners of the LWRA Project over 1000m² Award at the Titanic Hotel in Liverpool last month.
Working with Williams Roofing Contractors Ltd, the winning project involved the refurbishment of a large water treatment plant that imposed stringent environmental and performance requirements.
Following a survey of the roof area conducted by Williams Roofing and Polyroof Technical Services, a detailed report was carried out, after which a bespoke specification was produced and handed to the client. This detailed a comprehensive set of recommendations for solving the issues caused by the aged condition of the roof coverings.
As this was a live ‘Clean Water’ site, all Williams Roofing Contractor staff were required to have EUSR National Water Hygiene Cards. The National Water Hygiene scheme ensures high Health & Safety standards in such environments.
Williams Roofing Contractors Ltd provided additional protection to ensure that no potential contamination or spills entered the clean water processes.
The necessity for certain roof areas to be scarified could have caused reverberations through the roof/concrete deck. This risked contaminants by the spooling of debris to within the MF Compound Water Lanes & Tanks. Additional protection was installed within the buildings above the Water Lanes/Tanks to ensure that any spooling of debris did not enter the ‘Clean Water’ process. If the Water Lanes/Tanks had become contaminated during works, the ‘Clean Water’ process may have been required to temporarily halt.
After moisture was discovered beneath a roof area, the customer agreed for the specification to be changed in this section. ‘Mushroom’ vents were installed to aid the dissipation of the moisture, which rid the client of the need to suspend the Water Process to fully strip the roof.
The River Intake Building was constructed of a ’Barrel Vault’ type construction which had a concrete rooflight detail with glazing blocks. The client wanted to keep the ‘Lux’ levels in the building but needed the roof to be watertight.
In order to provide a solution, the Polyroof Transglaze PU liquid was specified in conjunction with the Protec system. Transglaze is a translucent waterproofing system that permits the passage of light through the membrane into the interior of the building, minimising any reduction in light into the interior of the building. This was carefully applied to the glazed blocks before the Protec system was laid over the concrete sections to complete the seamless waterproofing on these details.
To ensure that water could drain from the roof, there were numerous through-wall outlets positioned at the bottom of internal parapet walls, each one needing to be made completely watertight. Using appropriate small roller application tools, Williams Roofing Contractors Ltd were able to fully seal inside each of these outlets with a liquid system.
The multi-surface ability of Protec meant that it could be applied directly to the brickwork of the parapet walls, saving the client further costs through eliminating the need to over-board. A key advantage of Protec is its high thixotropy, meaning it can easily coat vertical surfaces without the need for any additional thixo additives.
Intricate detailing within the various roof areas was especially prevalent in the MF Compound Building, which had two number banks of ‘Sump’ type details present. A liquid applied membrane was the preferred product in this scenario.
The result was the full encapsulation of the roof areas, without any aspect exposed to the elements.
View Protec Liquid Roofing System Product Entry