[Pyrkie]

Hi everyone.

Just after some advice about polytunnels.... my husband and brother-in-law are going to make one but they're planning on making it square.  Is that okay?  All polytunnels  I've seen are arched so I wondered if there was a reason, other than it being easier to construct?  Thanks for any advice 

[noshed]

If you mean a thing you can walk into, then tunnels are curved so you can use one sheet of plastic over the hoops. Square ones would need a join, or the plastic would tend to rip along the sharp edge. I've got a greenhouse made from rigid plastic sheets though and that is just a big cube with a sloping roof.
The old blokes on my site build tunnels from scrap wood and plastic piping and they seem to work quite well. I feel slighly responsible as I showed them this (or something similar - there's loads about): http://www.freewebs.com/alanparkin/apps/photos/album?albumid=3853592

[hindy]

If the roof was flat it would start collecting rain water and would put a lot of extra weight on the structure.

[Kristen]

Same thing as your link, noshed, but with some written instructions in addition to pictures:

http://www.overthegardengate.net/UserPages/pp_view.asp?FName=polytunnel&Page=1

[noshed]

That's the very one - egged 2 old boys on to break every allotment site rule in the book

[Laverne88]

I think that's brilliant!

 

[Pyrkie]

Hi.  Thanks for the replies - I'll make them have a look at the pics.  They thought about d oing it like that first but then changed thei rminds so I'll have to make them change them back 

Thanks everyone