Product / system manufacture
Jestico + Whiles
RIW Sheetseal 226, RIW Cavity Drain, RIW Toughseal, RIW Cementseal, RIW Flexiseal
This voluntary-aided school in Hackney was part of the BSF programme. RIW was asked by Jestico + Whiles to advise on waterproofing in the early stages of the design process.
This four-storey new build project is on a compact, stepped site, which tested the continuity of the waterproofing strategy. The numerous interfaces and changes in level needed careful consideration.
Bespoke waterproofing solutions were then proposed for the different substrate materials, from concrete in the ground rising to a steel main frame, with a secondary frame faced with cement boarding. Therefore, an isometric study was required to visualise the proposed strategy.
A range of different RIW products was used to accommodate the various changes in levels and to manage the differing movement capability at each of the structural interfaces.
A combination of RIW Cavity Drain solutions was recommended for the walls of the partial basement, along with RIW Sheetseal 226 across the slab. RIW Cavity Drain allowed water to be directed away from internal finishes to a maintainable land drain below the structure.
As the building rose out of the ground, the waterproofing strategy had to adapt to maintain continuity, as both the structure and the retaining walls were stepped. Both RIW Toughseal and RIW Sheetseal 226 were used to continue the waterproofing to the required level above ground.
RIW Flexiseal was used on the entrance podium to provide waterproofing over the basement, and RIW Cementseal maintained continuity at isolated pad locations below the basement slab.
This combination of products resulted in an effective and single sourced, total waterproofing solution.