Noisy Banging Flat Roof Problems
If you have problems with a noisy, banging and clicking flat roof, this is something that happens when there are extreme changes in external temperatures. At the beginning and end of the year, I get lots of calls from customers regarding their noisy roofs. The external temperature can drop to around 0ºC at night and rise to 10º - 14ºC during the day, but the surface of the roof may be colder or warmer depending on the solar gain; this is all down to shadows on the roof, the orientation of the roof to the sun and so on. However, what we do know is that the temperature gain is at its greatest in good sunlight. This leads to expansion and contraction of the roof and noisy banging and clicking of the roof, mainly in the morning when it's heating up and in the evening when it's cooling down. We know that the problem exists more with new GRP (Glass Fibre roofs) than with any other type of roof. The problem with GRP roofs is their conductivity, i.e. the way they transfer the heat to and from the materials below. Other roofing systems such as felt and EPDM rubber are less conductive, therefore the swings in temperature are less. We also know that GRP roofs are hard and solid, and therefore very prone to expansion. The GRP trims are long and, when fitted into a wall and sealed together, expansion joints should be used, but we rarely see them.
Another problem could be the fixing used on the roof; if long metal screws have been punched through the roof, could these have an effect? To date we have never had noise problems with a flat roof that has been fixed down with glue or with thermally broken fixings. Having said that, I have never seen a GRP roof fixed down using thermal broken fixing or glue.
Unfortunately after trying many different ways of stopping the noise, and not being entirely successful, the only true way of solving the problem seems to be to have the roof replaced, and to use the correct fixings and less conductive waterproofing membrane, such as mineral felt or a single ply EPDM.
Steven Dickinson
London flat roofing
07802300099
info@londonflatroofing.co.uk
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