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Model Roof Project

  • 04-10-2011 2:34pm
    #1
    conbue
    Registered Users, Registered Users 2 Posts: 11 ✭


    hi,

    I need to make a modle of a hipped roof and start by marking the common rafters.

    cant seem to get the hang of the roofing square

    the run of the roof is 600mm
    the rise is 400mm

    any help on how to get the cuts and measurements please


Comments

  • #2
    Poor Uncle Tom
    Registered Users, Registered Users 2 Posts: 14,547 ✭✭✭✭Poor Uncle Tom


    Pythagerous is your friend. If you are saying that half the span plus one overhang is 600mm and the rise is 400mm.
    Then:

    The square on the hypoteneuse is equal to the sum of the squares of the other two sides, so:

    the rafter length is 721.11mm


  • #3
    sydthebeat
    Subscribers Posts: 42,569 ✭✭✭✭sydthebeat


    conbue wrote: »
    cant seem to get the hang of the roofing square

    not quite sure what you mean here...
    To set out a roof, the rise of the roof is set on the narrow bit (the tongue) and the run of the rafter is set on the the wider bit (the blade), you'd then normally set the rise and run on the square by scaling down your measurements by ten. E.g. 3.5m becomes 350mm and so on. You join the readings on both scales using a batten or the like, and you get your various required lengths and angles from these readings.

    The tables that are often on them give rafter lengths per metre run for 'standard' pitches.

    from here


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