fourmations wrote:
hi phil (and all)

the sheets are 2100mm x 3000mm (7' x 10') 10mm twinwall polycarbonate
I am very open to suggestion on all aspects of the building
(no experience of g-houses whatsoever)

There aren't any hard and fast rules, I have two, one polycarb, one glass,
both timber framed.

I have the tools & industrial saws in work to cut the sheets and frame
elements to suit
at any angles sizes etc etc.
(I work in a signmakers and have access to these things at trade
price)


cutting the polycarb can be done with any decent saw, hand or power.

I was thinking of using aluminium for the framework
i can use angle or actual purpose built section that the panels slot
into (the type of thing exhibition panels, and the like, are joined
with)

The thing with aluminium is that it's not very strong, and neither is the
polycarb (I'm thinking of severe winds here) affixing it to the house with
ally would be a good idea but I'm not too sure about the corners, unless you
propose putting an angle inside *and* outside the joint, with bolts through
all three materials?....mine's just nailed onto 3X2 timber, but then again,
mine isn't joined onto the house - it's behind a shed out of sight somewhat.


Also in your OP, you mentioned that on the westerly wall, there's a
passageway? - how much gap have you got here? - is there another house?