September 2019

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An Inspector Calls Above and below, delamination: Flaky situation – a complete re-roof is not far away... “The removal of the moss had helped drag away the surface material of the tile” Flaky tiles The death knell for the roof is if and when tiles do start to delaminate. It occurs when water, absorbed into the slate or tile during the winter, freezes and expands, causing the fired clay mineral layers to separate and ultimately flake off. If you can see tiles delaminating on the surface, then chances are that under the lap – where the surface is darker and damper – you will find even more. At best and at least, it is a partial strip and reroof as, at this point, the delamination is only going one way – and that is towards complete roof failure. Not to mention that the debris falling down the roof will be obstructing the free flow of water off it. Don’t assist delamination… The thing we absolutely should not do when the first signs of delamination appear in the roof is help it along! The images show an old clay roof that had been beleaguered with moss and dirt. As the moss fell away, it was blocking the gutters and – as nobody likes having to get up there to clean them – a contractor was called in to deal with the problem. A quick wash and a brush later the moss was gone and the roof looking very clean: yet very, very broken. The removal of the moss had helped drag away the surface material of the tile, and now the failure of the roof covering was well underway. Care should be taken when making any alterations to the surface of the roof covering, especially when dealing with an aging roof. Often attempts to carry out superficial repairs can result in bigger problems. The main issue here was that the customer was not made aware of the risk to the roof covering and what started out as a maintenance job turned into the prospect of a reroof. One could of course argue that the damage was already done beneath, and the greater work would need to happen at some point anyway, yet forewarned is forearmed. “At best and at least, it is a partial strip and reroof as, at this point, the delamination is only going one way – and that is towards complete roof failure” Contact BMI National Training Centre 01285 863545 www.bmigroup.com/uk @_Redland / @Icopal_UK 36 TC SEPTEMBER <strong>2019</strong>
Refurb & repair problems – solved! Replacement rooflights to match any profile Warehouse, Heathrow GRP barrel vault rooflights – perfect for curved roofs Distribution Centre, Kent Fixsafe allowed safer rooflight replacement at this warehouse Monarch rooflights: the ideal daylight solution for curved roofs Lightweight GRP over-roofing Water company depot, Yorkshire Simpler, more cost-effective roof refurbishment Industrial Unit, Wiltshire Safer rooflight replacement with no roof access Factory, Middlesex Roof refurbishment and canopies Byker Wall Estate, Newcastle-upon-Tyne All these diverse, demanding refurbishment challenges have one thing in common. In each case, the solution was a specifically designed GRP sheet or associated product supplied by Filon Products: the building envelope refurbishment problem solver. ...please call us for details or to discuss your project, on 01543 687300 Filon Products Ltd, Unit 3 Ring Road, Zone 2, Burntwood Business Park, Burntwood, Staffs WS7 3JQ www.filon.co.uk
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Page 5 and 6: I V Editor’s Comment MATT DOWNS E
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September 2019

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