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An external wall insulation system manufactured by Sto has helped to renovate historic hangar buildings at Pembroke Dock in Wales.
Architect Purcell specified Sto to upgrade annexes connected to two hangars, allowing them to be transformed into new office and workshop spaces.
One of the annexes required a two-storey extension, while the other had to be rebuilt. For both projects, the StoTherm Mineral M external wall insulation system was selected with a Sto render façade finish, which includes mineral fibre insulation boards for a high level of fire protection and thermal performance.
Main contractor R&M Williams fixed the insulation boards to cement particle boards, installed to the light-streel frame structure, with Sto-Rotofix Plus mechanical fixings.
These helical spiral fixings can overcome the problems of variable cavity requirements, as the position of all the fixings can be viewed during installation and easily adjusted to achieve correct alignment of the insulation boards. A 20mm drained cavity behind the insulation boards was created for this project allowing any excess moisture to drain out of the bottom of the system, meeting the requirements of NHBC Building Control.
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