Pergola Span

[Melisou]

Hi there, I have spoken to many people about a pergola I would like to have built. I would like the pergola to come out 6m from the house but I have been told that I can have this but I have to have centre posts to support this. Can someone please let me know if I can go 6m wide without having any centre supports ?

[ozwinner]

What sort of roof are you going to have, flat or pitched?

Edit: and roof covering material?

Al

[Melisou]

I would like a flat roof with polycsrb rofing covering reed fencing for a balanese look. The polycarb to keep out the rain. I have a picture but I dont know how to post it.

[Melisou]

http://melisou1.blogspot.com/

I was able to post the pics on the above link

[ozwinner]

If you want single span at 6M, the tables I have suggest f7 ( Oregon) at 300x75mm. :eek:
Which is one hell of a lump of timber.

Why not pitch the roof and have collar ties, you will still have clear space under the pergola.

Al

[Gumby]

I've seen plenty around that size without centre supports but you have to have the right size beams etc.

A poly carb roof isn't heavy. Blowing off is more of a concern than falling down.

[Wood Butcher]

For something like that, steel C-150 would span 6 metres with you batten on top, but then you would have to disguise the steel somehow.

[Shannon Nash]

Having spent about $1000 dollars and several hours with Polycarb and having compared the available brands I can tell you that a 5 degree pitch is required with pretty much all polycarb. That would be about 530mm fall over a 6m span so a 'flat' pergola with polycarb may not be possible!

Cheers
SN

[Sturdee]

That would be about 530mm fall over a 6m span so a 'flat' pergola with polycarb may not be possible!

Cheers
SN

I have a 200mm fall over 4.8 metres and provided that you get the large valley type that fall is okay as the fall is only to get the heavy downpour to drain away before the wind drives it over the corrugation between the sheets.

So with proper design and the fall going both ways from the centre it can be near flat.

Peter.