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Flat Roof / Joist layout

Discussion in 'Building' started by SS-ProjectBuild, 11 Nov 2020.

  1. SS-ProjectBuild

    SS-ProjectBuild

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    Hi guys,

    Would anyone be able to suggest the best way to frame this flat roof (cold roof because of height restrictions)? Will be using C24 9” x 3" and all the internal walls are solid block load bearing.

    I was thinking about creating a 2 way fall to each side with firring strips. OSB and then 3 layer felt system.

    There are 3 fixed sky windows also.
     

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  2. tony1851

    tony1851

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    Probably best running joists left-to-right, with a timber trimmer across the short gap in the middle (assuming it's a detached structure?).
    Cross-ventilation will be an issue, particularly with the rooflights.
    Why the three layers of felt finish? - so very 1970s. Why not GRP or EPDM?
     
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  4. SS-ProjectBuild

    SS-ProjectBuild

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    Yup read my mind - i was thinking left to right.
    The firrings will provide a ventilation gap plus im planning on using slightly shorter noggings to allow air to pass over.

    The rooflight ventilation is an issue i have thought of but no luck finding a proper solution yet (unless i run small holes from front to back through the joists and have front to back ventilation also?
     
  5. SS-ProjectBuild

    SS-ProjectBuild

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    Ive heard there are noise issues with grp and epdm? i dont really want it sounding like a tin can.
     
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