![]() It is generally expensive to change any aspect of a trussed roof designĪfter installation due to the structural implications of any alteration, e.g. Trussed roofs can be used over larger spans than traditional cut roofs and are installed more quickly, even though there will be some element of work on site for dealing with openings, chimneys, water tanks and the like. The detailed design and fabrication is done by the manufacturer. The vast majority of modern houses are now built using prefabricated trussed rafters which are produced off site and craned into position in a day. This generally results in being able to use, or convert at a later date, the roof space because the cut roofs tend to use larger size timbers than truss roofs. It will not be a surprise to note that our grandparents (who always knew the most economical way to build, as outlined in previous articles) generally constructed their properties with a pitched roof. Green roofs for example require additional supports. Average cost to replace a roofĪ zinc roof finish for instance will not generally last the lifetime of a property and will certainly not last as long as a natural slate product, so these considerations will need to be examined prior to final selection of the roof finish and the structure beneath. The aesthetics will also obviously have a large impact on which type you choose pitched roofs often suit small building designs better than flat roofs but the final choice will generally be down to local considerations, planning restrictions and personal choice. If there is a restriction on the ridge height of a property, (total height of the house), a flat roof system will maximise the internal floor to ceiling height.
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