The Dixon Street Flats in central Wellington were completed in 1944 as part of the first Labour Government’s state housing programme. The building was the first major high-rise building and first major apartment block to be completed in Wellington after the Second World War. Ten stories high, it contains 115 one-bedroom flats plus a two-bedroom caretaker’s flat.
Access to the apartments (flats) is from the rear, via 9 levels of balconies/walkways/external corridors. Access to the walkways is by two sets of stairs at each end and two sets of lifts in the center.
The walkways were originally waterproofed using 1″ (25mm) thick trafficable Mastic Asphalt.
In the 1970’s during refurbishment the original mastic asphalt was overlaid with new 1/2″ (12mm) roofing grade mastic asphalt.
By 2009/10 the exterior of the building was in need of serious repair, including the walkway mastic asphalt.
The work had to be carried out while the building was still occupied, so the option of totally removing the two layers of mastic asphalt and replacing with new was not viable. As the building has a Historic Places Category 1 classification, the Housing Corporation and their Architects wished to retain the look of the mastic asphalt walkways as close as possible, yet bring them back to being waterproof and serviceable.
The solution we came up with was to repair the mastic asphalt using traditional mastic asphalt repair techniques and then apply a Nuralite Nuracolour coating system, with added silica sand to provide a non slip, tougher wearable and UV protective finish. The colour chosen was Ship Grey, to give the appearance as close as possible to how the the original mastic asphalt would have appeared after having aged a few years.
The images below show the extent of the work (1200m2 over nine levels) and examples of some of the defects requiring repair.
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