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 £19m 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 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.
SIG Design & Technology has added a range of warm roof systems to include Cut-To-Falls, flat board, recovery board for overlays and one for specialist acoustic applications.
