isit possible to do a 8m span using timber only

[Zulfiqar baig]

Hi guys

I am in the middle of a man cave project. the overall size is 8m x 8m single skin block.
the walls are almost up and now we tackle the roof.

I really want to avoid putting a wall inside and would prefer one large open plan design. my question is first is it possible to do with timber only across and 8m span for a flat roof

if yes what size joists would you recommend aswell as spacing.

thanks in advance guys

 

[Dereekoo]

Well assuming DL of 1Kn/m2 and snow load of 0.75kn/m2 a C24 150 wide x 300 deep spaced at 400 centres ( or 75 x 300 at 200c/c) would keep deflection just within 14mm limit but as for practicality and sourcing ???

 

[big-all]

building regs compliant and planning permission required are you aware off the requirements like 2,5m high and 50% off garden

https://ecab.planningportal.co.uk/uploads/miniguides/outbuildings/Outbuildings.pdf

 

[^woody^]

Engineered joists.

 

[Dereekoo]

Engineered joists.

Engineered Floor Joists: Complete Guide

Engineered floor joists are made of wood strands bonded with adhesive. They are stronger and lightweight than traditional joists and can span up to 60 feet. However, they are more expensive than traditional joists. One

mellowpine.com

 

[johnny2007]

Column in the middle of garage if possible.

 

[bsr]

I think you have two options for a clear space. Either posijoists as @Dereekoo said, or you put a steel across to half the span.

 

[freddiemercurystwin]

Well assuming DL of 1Kn/m2 and snow load of 0.75kn/m2 a C24 150 wide x 300 deep spaced at 400 centres ( or 75 x 300 at 200c/c) would keep deflection just within 14mm limit but as for practicality and sourcing ???

Or instead use a glulam beam, they go up to 1.2m deep and more as standard.