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Roof Purlins

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  1. #1
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    Default Roof Purlins

    I was wondering wether someone could tell me the need for roof purlins

    I am building a roof 3 degree pitch over a deck that is 3.5m out by 6m long, I am using 190 x45 for the bearers and rafters, what is the main difference with using roof purlins (70 x45) and the other method of just noggin it out with no purlins, other than purlins being the faster method, are their any advantages of having purlins.

    I thought maybe the purlin provided the roof with an air gap to prevent condensation.

  2. #2
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    What you are referring to are battens,not purlins.It boils down to personal preference for the look you want.

    Tools

  3. #3
    Golden Member GraemeCook's Avatar
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    Quote Originally Posted by Tools View Post
    What you are referring to are battens,not purlins.It boils down to personal preference for the look you want.

    Tools
    Purlin is quite correct, although many people now call them battens.

    I am not certain but I suspect that purlin is the British term and batten is american.

    Cheers

    Graeme

  4. #4
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    Purlins and battens are not synonymous. Purlins are placed on edge and battens are placed on the flat.

    Tools

  5. #5
    Building Designer ausdesign's Avatar
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    I suppose it comes down to whether its a 70*45 or a 45*70
    Peter Clarkson

    www.ausdesign.com.au

    This information is intended to provide general information only.
    It does not purport to be a comprehensive advice.

  6. #6
    Old Chippy 6K
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    Quote Originally Posted by ausdesign View Post
    I suppose it comes down to whether its a 70*45 or a 45*70
    Love it when the talk gets all technical . . .

  7. #7
    1K Club Member autogenous's Avatar
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    In a pitched roof Purlins hold up rafters and take toms or props

    Battens sit on top of roof where tiles or tin roof medium are fixed too.

    Metal roofs can have Z Purlins
    https://www.instagram.com/perth_bricklayer_wa

  8. #8
    1K Club Member autogenous's Avatar
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    I am building a roof 3 degree pitch over a deck that is 3.5m out by 6m long, I am using 190 x45 for the bearers and rafters,

    Will the 190mm span 3.5 metres without sagging? The noggins are trimmers

    Really you want rafters that will span 3.5 metres. You can then batten over the top or trim out with lighter material to stop the rafters twisting.

    If you trim out the same centres with the same as the rafter material you will potentially double the weight on the spanning rafters.
    https://www.instagram.com/perth_bricklayer_wa

  9. #9
    Apprentice (new member) straight_edge's Avatar
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    A batten is a size of timber, like bulk, board scallion or plank timber! Purlin and girts relates to steel construction, which can be a z,c or hat section.
    ....any how

  10. #10
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    Both purlins and roof battens can be either metal or timber. And I am pretty sure that the TFM has seperate tables for roof battens and purlins..


    Tools


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