http://www.trammellphoto.com/truss-square/
Single Storey Extension Self-Build Roof Question?
I am currently considering selfbuilding a small single storey extension, I have done a few construction projects in the past and always like a challenge. I am totally happy with foundations, footings, DPC, DPM, bricking, blocking, lintels etc but the roof daunts me. We want a pitched roof and the projects isnt huge at only 3m square but I would like some very, very basic questions answering. I understand that I need to build the brickwork & blockwork to celing height and build up the gable end at the same angle as the trusses. What fastens the trusses to each other and to the gable end and walls. Also once they are in place, is it some kind of felt first, then tile lats + tiles or is there something in between. If the gables are too long, do people just cut them off to fit the soffits & fascia boards. I dont know the jargon and I dont want to sound like an idiot in some builders merchant when I go to price the bits up !
It depends on the type of roof structure you want. For example, you can buy ready made trusses which attach to a wall plate set at eaves height, such are held down with clips which you can buy at any builders merchants and the wall plate itself has restraining straps to stop uplift. The trusses are set at 600mm centres so provide fixing for your ceiling plasterboard they themselves need bracing. The roof is normally covered in a felt and then “slate” laths are fixed at centres commensurate with the type of covering you are using-slate or tiles. The trusses will give you the profile to finish off your gable brick and block and they normally overlap the wall plate and are cut off vertically so that you can fix your fascia to such. However, you have to ensure there is ventilation to the roof, so a plastic perforated channel is fixed to the space between fascia and wall. Really, I don’t understand your problem, since you will have to provide drawings for possibly planning and certainly building regulation approval and whoever does these drawings for you will detail what needs to be done. Wouldn’t recommend doing it without the foregoing, you could find yourself in deep dodo.
Monster Truss from www.cheaplights.com, Square 12″ Steel 6 foot long
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