Many problems can occur over time with torch on flat roofs that will allow water to penetrate the boards below, and eventually into your property. Whether splitting has occurred through puddling of water, warm weather heating and expanding the bitchumen felt or through debris impacting the roof, if caught early enough, we may be able to carry out some maintenance that will help prolong the lifespan of the roof.
This can be done by sealing any cracks with bitchumen before they get any worse or by using torched on felt patches to repair any areas that are already causing internal water damage.
If your flat roof is in need of a complete renewal or repair we always install a 3 layer flat roofing system. Firstly, we need to strip the entire roof area, felt, boards if required etc and expose the roof timbers below, checking for any substantial water damage and replacing with new where needed. We then need to check you have the correct fall on the construction of the roof to allow rainwater to be taken from the roof and into the guttering, alleviating any problems your roof may be currently be suffering from, ie puddling of rainwater.
Once this is complete we then install new osb3 boarding to the roof . We then tack on the first undercoat layer of felt, 2mm bitchumen backed. Once this is complete we then torch on the 2nd undercoat layer of of 4.0mm bitchumen backed to give 100% water resistance. Then we apply a thicker topcoat layer of green mineral bitchumen backed felt. We then finish off by installing code 4 lead flashings to any brick abuttments adjoining your flat roof.
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