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Hydrostop AH-25 offers fast track solution at Gatwick Diamond “Blue-Light” offices Hydrostop AH-25 offers fast track solution at Gatwick Diamond “Blue-Light” offices

Hydrostop AH-25 offers fast track solution at Gatwick Diamond “Blue-Light” offices

Hydrostop AH-25 offers fast track solution at Gatwick Diamond “Blue-Light” offices

Project: Gatwick Diamond Manor Royal
Client: Surrey County Council
Architect: HGP Architects
Main contractors: Willmott Dixon
Roofing contractors: Southern Industrial Roofing
Liquid waterproofing system: Hydrostop AH-25

Hydrostop AH-25 liquid waterproofing was chosen as a better alternative to built-up roofing for installation to a new build Surrey County Council office development.

The local authority has been developing a brownfield site known as Gatwick Diamond Manor Royal which has been pre-let by South East Coast Ambulance Service and scheduled for occupation in September 2016.

Willmott Dixon’s Cobham Surrey office, which enjoys a strong reputation for commercial office development, has managed the construction of the £19milllion four-storey development, designed by award winning architects, HGP.

NFRC member, Southern Industrial Roofing of Portsmouth was appointed by the main contractor to undertake the 1800m2 roofing project.

Hydrostop AH-25 is a wet-on-wet cold applied liquid waterproofing system that contains no solvents or isocyanates, with a very low VOC content.

The AH-25 system was applied over a concrete substrate with a bituminous vapour control layer with Eurodeck liquid roofing board and cut to falls insulation.

For the installation process, the roof was first cleaned. Then a base coat of AH-25 was applied, into which an 110gsm layer of polyester reinforcing fleece was embedded, whereupon it was immediately saturated with a second coat of liquid. AH-25 is totally impervious to standing water, and as it is a single component liquid, it does not require a catalyst to be mixed into the product before use. The product comes with a 25-year guarantee which can only be offered by SIG’s DATAC accredited installers.

The Managing Director of Southern Industrial Roofing, Guy […]

Vue Cinemas, Doncaster. Picture: Andrew Roe
Cool customer Cool customer

Cool customer

Cool customer

Project:  Vue Cinema Doncaster
Client: Vue Entertainment
Architect: DG Architects Ltd
Main contractor: Key Property Solutions
Roofing contractor: AROOFA Ltd
Liquid Waterproofing membrane: Hydrostop AH-25

When a Vue Cinema on the outskirts of Doncaster needed a section of the asphalt flat roof refurbished as part of extension and maintenance works, a zero odour solution was required that would allow the building to stay open to the public throughout installation.

­­­­The 750m2 roof, located in the centre of the cinema above a stair and lift core and projection rooms, was covered with a lot of mounted plant, equipment and trunking, making it too disruptive and noisy to take up and replace the existing asphalt. A liquid cold-applied waterproofing product was considered ideal to avoid the need for complex edge detailing associated with single ply or bitumen products around the plant.

With the cinema screens in operation a few feet away there was also potential for fumes to enter the building through air conditioning intakes on the roof. As these units could not be shut down, it was vital to both the client and project that a solvent and fume free solution was used in the course of the refurbishment.

With these concerns in mind, specification manager Cameron MacAndrew, from SIG Design & Technology chose to recommend Hydrostop AH-25, a wet-on-wet cold applied liquid waterproofing system that contains no solvents or isocyanates, with a very low VOC content.

‘Hydrostop AH-25 emits no fumes and no odour, which meant the cinema could continue business as usual for the week,’ said MacAndrew; ‘Installers like AH-25 because it goes down wet on wet in a single pass install.’

Vue Cinema Website Case Study Inset ImageFor the installation process, the roof was first cleaned. […]

Sacred Heart Case Study Main Image Rework
Sacred Heart Primary School Sacred Heart Primary School

Sacred Heart Primary School

Sacred Heart Primary School

Project:  Sacred Heart Primary School
Contractor: City Building Glasgow
Liquid waterproofing system: Hydrostop AH-25

SIG Design & Technology’s Hydrostop AH-25 product was chosen to refurbish 450m2 of roof at the Sacred Heart Primary School in the Bridgeton area of Glasgow. The project was specified by contractor City Building Glasgow, formerly the building service department of the local authority, as part of a wider refurbishment of the school premises. The school buildings date back to the 1950s. Areas of the roof had been leaking, leading to considerable water damage and disruption to some classrooms.

According to City Building Glasgow assistant investment manager Charlie McLean, the priority for the roof works was to procure a waterproofing system with minimal hot works that would cause as little disruption to the school’s everyday activities as possible. The chosen system would also need to be suitable for installation on a distinctively pyramidal part of the school roof. Another important factor was health and safety, both for those installing the product and the school community.

Sacred Heart Case Study Before website Image

Sacred Heart Case Study After website Image

Before and after photographs of the roof at Sacred Heart Primary School

City Building Glasgow chose the Hydrostop AH-25 system because it met these criteria and offered additional safety, health and time benefits. Hydrostop AH-25 is a wet-on-wet, cold applied liquid waterproofing product that is reinforced with a polyester fabric. It is free of solvents and hazardous materials, and has a very low VOC content, making it fume-free and virtually odourless. Installers like AH-25 because it goes down wet on wet in a […]

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Balcony Waterproofing – why use a liquid? Balcony Waterproofing – why use a liquid?

Balcony Waterproofing – why use a liquid?

Balcony Waterproofing – why use a liquid?

Project: Riverwalk, London
Client: Ronson Capital Partners
Architect: Stanton Williams
Main contractors: Sir Robert McAlpine
Roofing contractors: Knight Asphalte Co Ltd
Balcony membrane: AH25 Liquid Waterproofing

Rising up from its Thames-side site at Pimlico at the meeting of Millbank and Vauxhall Bridge, River Walk is an elegant new development of 116 high specification apartments.  The sinuous form of the buildings is picked out in limestone and bronze cladding, forming ‘strata’ which curve in and out to form balconies and terraces, tied into an organic whole by the careful use of materials and exquisite detailing.

Towards the top of the buildings, the floors step back to create large roof terraces, but overall the scheme has 170 crescent-shaped balconies, all of which need to be carefully waterproofed.  Specialist roofing contractor Knight Asphalte Co Ltd is carrying out this task, using Hydrostop EU AH-25, an alpha-hybid liquid waterproofing product supplied by SIG Design & Technology.

Why use a Liquid for Balcony Waterproofing?
The balconies at Riverwalk provided a unique challenge to the contractors. Each one is a different crescent shape, but all have tight tapers at the edges to ensure the continuity of flow of the sinuous limestone cladding externally. The balconies themselves are a combination of in-situ concrete casting and prefabricated steel end sections; each individually made in Italy and shipped to the site via the port of Rye.

 

Adding to the physical constraints of each balcony shape was the fact that the building was to be built without external scaffolding, so the waterproofing contractor would have to work in a very tight space. The high quality cladding in bronze and stone and the glazed balcony doors would […]