Levelling concrete for a greenhouse

tadpoleuk

Im going to put a greenhouse here . .

http://i220.photobucket.com/albums/dd261/tadpoleuk/GHPLOT1.jpg

I know its not the ideal position but it is the only space I have. The trouble is the concrete is dipping on the left hand back corner. I have used a spirit level on a plank of wood and it seems to be out about an inch and a half. The only thing I can think of trying is to build a wooden frame and prop up that corner with wedges or something to make it straight then maybe fill the gap underneath with cement? I presume if I just put the greenhouse down as it is the frame would bend and the glass wouldnt fit ? The greenhouse is 8x6 with toughened glass and would be very heavy. Would I be able to just screw the greenhouse base to the wood frame or would I need to bolt the wood to the concrete as well ?

If the wood frame is the best way to go how thick would the pieces of wood need to be to take the weight ? Or am I looking at this the wrong way and maybe I could just put the cement directly under the greenhouse base to lift it up? The base is an integral aluminium one. Im looking for the cheapest solution but it needs to be a good one

Im not good at DIY and have been outside looking at this bit of concrete for days trying to think of the best way to do it... Please can anyone give me some advice ?

DKLS

I am probably not the best person to advise, but what I did, was use some railway sleepers as the base and the base of the greenhouse framed just screwed in which in turn allowed me to have deeper beds of soil.

susieb

I presume it dips to stop any rain flooding the slabs or worse your house.
I would be inclined to do something with wood, like you suggest

a11waysindebt

Hi,

You could always put the frame down on a drymix and level the greenhouse up.

helcat26

Fill in the big gaps with something solid like concrete slabs, then make a sort of mould around where you want the base to be with wood planks. then fill area with leveling compound- its a sort of mix you can get from Wickes which forms a slurry drying out flat. Build up in layers. Only thing is after it dries it can flake so if you intend this to be the floor put someting on top.

alanobrien

I would just put down aggregate and put the frame on that. OK the level of the aggregarte would be deeper in that corner but who cares. It also makes a good internal base inside the frame to spray in the height of summer to keep the inside of the greenhouse cooler.

tadpoleuk

What a lot of different suggestions .... Thankyou all ,thats given me more to think about . Delivery is scheduled for Monday so I will get busy this weekend, not sure which one I will go with yet maybe I will give all the ideas to my stepdad and let him make the decision