Baldock / United Kingdom
Hartsfield Junior and Mixed Infant School in Baldock had a metal roof that was suffering from leaks and interstitial condensation – which had led to poor thermal performance. The school required a new waterproofing system and insulation upgrade that could be installed whilst the school was open.
Building Control insisted that the roof had to maintain its original appearance, therefore a trial area was completed before the main works began to demonstrate that the polymeric membranes’ solution would satisfy their requirements.
Facts and Solutions
The existing 3,000 m² roof system was utilised as a new structural deck, with additional fasteners added to ensure attachment of the original metal roof to its structural supports. In order to alleviate the condensation problems a new insulation was installed and mechanically fixed to the metal roof. The new roof system was then completed with an installation of polymeric felt single ply membrane in lead grey with Decor Profiles. The roof works began in February and were completed in August with the installation of new gutters and downpipes. The producer’s solution offered a more cost effective option when compared with a metal alternative, and by overlaying the existing construction disruption was minimised and the school could safely remain open. Had another metal roof been installed the school would have to be closed. Using the Decor Profiles and lead coloured single ply membrane also meant that Building Control was satisfied with the finished appearance. They also benefitted from working with the polymer single ply approved applicators from the professional service offered on a roof refurbishment project.
Contractor: Cambridge Polymer Roofing
Owner: Hertfordshire County Council
Architect: Mouchel (Hertfordshire County Council)
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