As competition for schools construction projects remains high and costs are driven down, the need to meet standards of robustness, energy eﬃciency and acoustic performance become more challenging.
Our clients, WATES undertook a major building programme at a girls’ school in London. Part of the Priority Schools Building Programme (PSBP) and this legacy project included a new dedicated sixth form building, new sports hall and dining room. Cost eﬀectiveness was paramount and the school remained open throughout the project.
Together, the four roofs on the project, totalling over 2000m2 required two diﬀerent ﬁnishes from IKO, three diﬀerent build- ups and, crucially, one single Labour and Materials Warrantee to cover all four under our PI Insurance.
The four roofs
SIG Design & Technology, as a supplier rather than manufacturer, were able to oﬀer impartial, unbiased advice for each roof, thereby delivering signiﬁcant savings.
The right products – changing rooms and 6th form block
The two concrete plank roofs were to be put to falls using screed, but cut-to-falls insulation provided a cost saving through a reduction in weight and drying time, and allowed for a winter installation. A robust built up felt rooﬁng system, with a slip resistant, granular ﬁnish, was cost eﬃcient and met the access needs most eﬀectively.
Meeting the regulations: dining hall roof
A metal deck with no ceiling would have meant a very noisy dining hall. We recommended a mechanically ﬁxed roof build- up comprising a perforated deck with trough in-ﬁlls to enable the roof to meet sound absorption class C more cost eﬀectively; a Polyethylene VCL; our own 10mm acoustic mat; PIR insulation, and IKO’s Armourplan PVC single ply membrane.
PSBP schools must meet onerous standards for rain noise drumming. Each new or refurbished school needs an individual acoustic report and each room tested for compliance with acoustic performance standards.
Planned maintenance: the sports hall roof
Where there is to be regular maintenance foot traﬃc, main contractors prefer several layers of reinforced bituminous membranes. However with a perforated deck, the bitumen primer required for the felt vapour control layer would stain the decking webs and with no ceiling, this would be unsightly. SIG negotiated a hybrid system with our partnering manufacturer comprising a robust, cost eﬀective, reinforced bituminous membranes with a polyethylene VCL to solve acoustic and aesthetic issues.
Delivering a single guarantee
Tilbury Contracts Limited as one of SIG’s Design & Technology’s Accredited Contractor (DATAC) members was able to provide the installation expertise. SIG Design and Technology monitored all installations, produced site reports and ensured the roofs were all installed as speciﬁed.
Eamon Twomey, Project Surveyor for WATES said: “The project required a robust, value engineered solution with a single point guarantee. We could not have sourced this solution elsewhere. SIG Design & Technology led on the roof design in partnership with the architect, Tilbury and WATES. The roof design solution needed to comply with the latest acoustic regulations on rain drumming noise and future proof maintenance requirements for access by foot traﬃc and PV array. We found the 8 step approach both thorough and reassuring. SIG Design & Technology and Tilbury Contracts delivered.”