Treated pine beam span

[DanPart]

Hi,

I'm putting up a freestanding patio (5 x 2.6m) with insulated roof panels on top. I've got 6 post footings at the moment but wanted to eliminate the middle 2 posts and just have 4 posts. If I'm using treated pine what size beam would span the 5m? Or is that too far? For roof load, depth is 2.6m, 8.7kg/m2. Low class wind area.

Thanks,

Dan

 

[catlad]

Some form of flitch beam will do it.

 

[Dereekoo]

Are you proposing insulated roof panels spanning across 2.6m from one 5m beam to the other??

 

[DanPart]

Are you proposing insulated roof panels spanning across 2.6m from one 5m beam to the other??

Yeah that was the plan

 

[RonnyRaygun]

It's not carrying anything more than the normal design load for a joist if you don't intend to put any imposed load on it. A 50x225 joist would be fine, but double them up to enable a better connection at the posts.

Also ensure you follow the manufacturer guidance for fixings as you will get considerable wind uplift from time to time.

 

[Dereekoo]

Treated pine means nothing, you have either grade c16 or c24.
Assuming C24 and all they are taking is the dead load of the roof panels i.e. no snow loads a 50 x150 joist would suffice giving you a deflection of 11mm. Wind loads not accounted for and based on Service environment 3 i.e. outside subject to wet conditions

 

[noseall]

Also ensure you follow the manufacturer guidance for fixings as you will get considerable wind uplift from time to time.

Not to mention racking...

 

[DanPart]

Treated pine means nothing, you have either grade c16 or c24.
Assuming C24 and all they are taking is the dead load of the roof panels i.e. no snow loads a 50 x150 joist would suffice giving you a deflection of 11mm. Wind loads not accounted for and based on Service environment 3 i.e. outside subject to wet conditions

No snow in Sydney haha. Our grades here are mgp10 andn f7 for standard structural building. Higher stress grades are f17 and mgp12 which I'm guessing are similar to your c24.

 

[Dereekoo]

No snow in Sydney haha. Our grades here are mgp10 andn f7 for standard structural building. Higher stress grades are f17 and mgp12 which I'm guessing are similar to your c24.

My calcs based on BS so please ignore as I'm ignoring The Gabba

 

[DanPart]

My calcs based on BS so please ignore as I'm ignoring The Gabba[/QUOTE

Hahaha poor old England

 

[catlad]

A 6x2" timber beam at 5m will deflect on self weight alone!

 

[DanPart]

A 6x2" timber beam at 5m will deflect on self weight alone!

Would 290mm x 45mm do the job?

 

[Dereekoo]

A 6x2" timber beam at 5m will deflect on self weight alone!

Yes by about 2mm

 

[Dereekoo]

Would 290mm x 45mm do the job?

Well that would take a roof load of 60kg/m2 to British Standards on deflection and strength requirements at C24 grade. England fighting back.

 

[catlad]

Yes by about 2mm

Enough to catch my eye then.