6m beam span + extra pitch

**luke p** · 15th May 2006, 09:32 PM

hi guys, new hear i was wondering if anyone could help me with this one im looking at attaching a flat roof pergola to the side of the house but it needs to span 6m. i need to know the rafter size, rafter spacing, beam size and post spacing. but the catch is there will be a pitched roof on top of the 6 m beam but only over half of it how would i work this out and will the 6m beam eventually bow down in the centre because of the added weight ? In short it will be a flat roof for three meteres of the six meter beam and then have a pitch of 22.5 for the other half.

**Barry_White** · 15th May 2006, 10:00 PM

Is this something like you are looking at.

And do you want to put roofing on it.

**luke p** · 16th May 2006, 07:07 PM

yes that is what i am looking at, i will put fall back to the house of course. But yes it will be sheeted and it will also be 12 deep also with future possibillity of putting another 3m flat roof on the opposite side of the pitch.

**Barry_White** · 17th May 2006, 11:37 PM

Luke

This is probably not what you want to hear but my advise is to go to your nearest Spanline distributor and get a price off them. They will design it and engineer it and it will be maintainance free not cheap but you would very happy with the result for many years to come.

If you build it out of timber you will regret it for many years to come.

Below is a sample of what you would get.

**kva** · 19th May 2006, 11:39 AM

A 6m span for a pergola is very large. These sizes cannot be tacket out of the timber framing code. An engineer would need to provide these sizes for you and also footing details to suit.

Good luck.

Kane

**julianx** · 19th May 2006, 12:35 PM

two extra posts under the beam and it will work ok

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