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  1. 30th March 2008, 01:46 PM #31
    russall
    russall is offline Intermediate Member
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    Excuse the hijacking...

    I'm in debate on weather or not to use Poly or Colourbond...

    I'm leaning towards the colourbond but am wondering how much heavier it is than poly? The reason I ask is I have run a beam over a 4m span which is boarderline as far as the span tables go. It would be fine if it was a continuous span, but this beam is a single span....
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  2. 30th March 2008, 07:39 PM #32
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    Barry_White
    Barry_White is offline Deceased
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    Quote Originally Posted by russall View Post
    Excuse the hijacking...

    I'm in debate on weather or not to use Poly or Colourbond...

    I'm leaning towards the colourbond but am wondering how much heavier it is than poly? The reason I ask is I have run a beam over a 4m span which is boarderline as far as the span tables go. It would be fine if it was a continuous span, but this beam is a single span....
    Russall

    There wouldn't be a significant difference in the weight from Poly to Colorbond to make that big a difference on a dead load. The most important load is the live load which come from the uplift from the wind blowing across the roof surface. I think you would be quite safe with the Colorbond.
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  3. 30th March 2008, 08:29 PM #33
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    autogenous
    autogenous is offline Senior Member
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    http://www.eurocell.co.uk/conservatory.html

    Australia can be a bit hot for polycarbonate in large enclosed areas depending where you live.
    c2=a2+b2;
    When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.
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