exteriors
Leaks at new school solved by SIG
says Ian Dryden, SIG National Specification Manager – Bituminous Membranes. Both flat and pitched roofs needed
to be remediated. It was clear that the 450 sqm flat roof was damaged beyond repair and needed to be stripped right back to deck. A new roof was then added using the
School in Yarm started leaking. Water ran down internal walls and damp patches spread across ceilings. “We had problems with water ingress.
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We had to replace carpets and lots of ceiling tiles,” says school business manager Sarah Powell. Fortunately, the problem has now been
solved with the help of SIG Design & Technology, which specified its SIGnature Torch On System to remediate the leaking roofs once and for all. By avoiding complete stripping of the failed roofs, this strategy provided significant cost savings. The leaking roof area consisted of two
pitched oval roofs with a flat roof below. SIG’s investigation identified the cause of the problem as the oval roofs, where inadequate detailing around the perimeter upstands and at the intersection with the lower roof had allowed water to ingress and find its way through to beneath the flat roof and down the walls into the school. “It was a constant battle for the school,”
OT long after completion, the Foundation Stage and Children’s Centre building at Layfield Primary
SIGnature system, specified with the self-adhesive SA VCL Vapour Control Layer, tapered insulation, SIGnature 25 Underlay and SIGnature AA Capsheet. However SIG managed to find an
economical solution for the 250 sqm pitched oval roofs, which enabled the contractor to leave the original single ply roof in situ beneath the overlay rather than stripping and disposing of it, saving an estimated £60+ per metre. SIG worked with the contractor Roofix
to install the SIGnature system as an overlay. To address the issue of potential plasticizer migration between the old and new roofs, a 300g separation fleece was fitted on the original roof followed by a mechanically fixed SIGnature25 underlay and a fully-torch bonded layer of underlay and cap sheet. The second, crucial phase of the work
was the correct detailing of the junctions with the flat roof and the upstands around the roof perimeter. Roofix found a way to close mitre cut and bend the GRP trim in situ to fully encapsulate the upstand as an alternative to the original failed metal capping. “Good tradespeople come up with good
solutions,” says Ian Dryden, who praised the time and care that went into the detailing. Thanks to the craftsmanship of
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the contractor, the repairs were completed over the summer holidays in an aesthetically pleasing manner that came in under budget and – importantly - fully warranteed. “This ticked all the boxes from the
client and the local authority’s points of view,” says Dryden. The proof has been 18 leak-free months since the repairs.” Says Powell: “We’ve had no problems
whatsoever ever since. It’s a massive relief to have had no further disruption caused by the numerous water leaks to providing our services.”
www.singleply.co.uk
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