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Supporting a Flat Extension Roof Spanning 4 by 4 Meters

Postby BigBurd » Mon Oct 13, 2014 6:25 pm

I am going to build a 4 meter by 4 meter roof over my wooden structure extension. Do I need to support it in the middle or will timber joists support the weight? I am going to put Decra roofing tiles on top and there will be a minimal slope so it will effectively be a flat roof. Is there any guide books on line I can access. Thanks in advance. BigBurd
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Postby TheDoctor4 » Mon Mar 09, 2015 2:57 pm


Have you seen our flat roofing project? If not, this might offer some more help and advice: ... t_roof.htm

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Postby michaelbailey » Thu May 14, 2015 1:05 pm

web joists 14300mm span £27 each @600mm centres from howarth
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