Part of the Co-op Academies Trust since 2018, Portland School in Birkenhead is a primary school for children aged 3-11. Attended by Everton and England footballing legend of the 1920s and 30s, Dixie Dean, the main school building has had many additions over time, resulting in a roof with 24 roof areas at varying levels and with various roof build-ups. The whole of this 1600m2 roof was in need of refurbishment as part of a programme of maintenance and upgrades following the school’s transition to academy status.
The Co-op Academy Trust developed a speciﬁcation requirement for the project, which included the use of a bituminous system with an extended service life. The SikaBit® 25-year system provided an ideal solution for this requirement.
Safety precautions were even more important due to the live school environment so working with a rooﬁng provider that could offer a Safe2Torch system with self-adhesive membranes for torch-free zones was imperative. Sika’s specialist Roof Refurbshment team was able to do a full site survey and provide a Safe2Torch plan for the installation.
The quality and durability of the ﬁnish was also a key requirement of the project. The SikaBit® system, combined with the skills and experience of the team at rooﬁng contractor, Holloway Cook Associates Ltd, answered this need with neat detailing across all roof areas.
Co-op Academy Trust approached Holloway Cook about the project as a rooﬁng contractor that could deliver the role of principal contractor, including design, health and safety and installation within a turnkey package. The contractor considered the SikaBit system, along with the support of Sika’s Roof Refurbishment team, to be the ideal solution for this project.
All roof areas were stripped out, including removal of 19 layers of previous waterprooﬁng systems from the oldest part of the roof, to reveal varying substrates including concrete, plywood and asphalt decks. The Holloway Cook team prepared each roof area before applying the S-VAP HD SA air and vapour control layer (AVCL), followed by Sikatherm insulation.
The SikaBit® SA-730 self-adhered underlay was then installed onto the insulation followed by SikaBit® T-940 G Torch-on cap sheet in all Safe2Torch areas. For the torch free zones identiﬁed on the Safe2Torch plan, comprising the interfaces between roof areas and adjacent buildings, SikaBit® SA-940 G self-adhesive cap sheet was used. Holloway Cook also replaced façade’s and several windows as part of the project scope.
"Our team is very experienced in bituminous membrane installations but the SikaBit system is new to us. We have been very impressed with both the ease of use and quality of ﬁnish the system offers, all supported by the service and technical support that Sika’s Roof Refurbishment division provides throughout the project." Mike Holloway, Operations Director of Holloway Cook
Contractor: Holloway Cook Associates Ltd
Roofing Client: Co-op Academies Trust
Products: Sika® S-VAP HD SA AVCL and SikaBit® SA-730 self-adhered underlay