9/23/2023 0 Comments Repairing broken raftersGaps between adjacent tiles/slates near gable ends or party walls can also develop where the roof slopes have settled more than the walls. A missing tile/slate is not usually a critical defect, but repair shouldn’t be left for too long, especially on roofs clad with larger interlocking tiles (with less overlap), and on older roofs with torn, sagging or non-existent underlay. The odd dislodged or missing tile, is often caused by storm damage, or people walking on the roof for TV aerial/satellite dish installation. However, older roofs were generally built without any underlay, and instead relied on a good flow of air ventilating the loft to waft away any resulting damp. Any wind-blown rain that penetrates under the tiles should be safely channelled down to the gutters. Most roofs built post-1950s also have a layer of underlay (‘sarking felt’) providing a secondary defence. In most cases, rain ingress is only likely to be a problem where several adjoining tiles/slates are missing (thanks to the courses of lapped tiles/slates underneath). It’s not unusual to spot small gaps where one or two tiles or slates have slipped or cracked.
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