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Extra resources for A_124_FRP
It is very useful to keep up to date with these new products by checking roofing merchants’ stores and websites, or by subscribing to roofing magazines and publications. The common roof accessories that may be of use are as follows: • Metal trims: used for edge checks • Deck ties: used for pipe penetrations • Pre-formed outlets: used for roof drainage • Termination flashings: used as an alternative to lead or alternative lead flashings There are also a number of roof accessories that facilitate services, add lighting measures, provide access or utilize space on the roof’s surface, these include: • Tiles or slabs for use in a terraced roof application • Skylights or sun domes • Smoke vents • Access hatches • Green roof kits TERRACED ROOFS Some flat roof designs utilize the space that the roof offers by converting the flat roof to a terrace roof or balcony.
A good tip in the absence of sound advice from suppliers is to stick to the same manufacturer when purchasing all the layers of a built-up felt roof. Although rolls of felt contain colours and coding systems, they are also usually marked with ‘underlay’ ‘perforated underlay’ and ‘cap/top sheet’. (L to R) underlay roll, cap sheet and perforated underlay. PERFORATED UNDERLAY The first layer of a built-up felt roof system is often the perforated underlay. Most good roofers’ merchants will stock perforated underlay but, if necessary, a perforated underlay layer can be created on site for installation.
These are fixed to the top of any batten that forms an edge check and the felt is then simply torched onto the base of them. The edge checks are manufactured in lengths of around 2 to 3m and are joined together, allowing a 2mm expansion gap. Butt straps, which pass under both ends of the trims, ensure that rainwater does not enter the system. Do not install edge checks at the gutter edge, as rainwater will not be allowed to flow freely from the roof. Metal or GRP edge checks should be fixed securely around the perimeter of the roof, if there is any doubt about this, a timber plate should be secured in place before the attachment of the edge check.