Supporting a Flat Extension Roof Spanning 4 by 4 Meters Information, help and advice on many architecture, self build and design problems and issues

[BigBurd]

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

[TheDoctor4]

Hi

Have you seen our flat roofing project? If not, this might offer some more help and advice: https://www.diydoctor.org.uk/projects/bu ... t_roof.htm

Kind Regards

[michaelbailey]

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