Ok here is an update on my homemade greenhouse. As seen earlier in this thread, I used construction plastic sheeting to cover the greenhouse. Since it isn't UV protected it doesn't last more than a year.
Well I couldn't affoard to cover the whole thing in Polycarb, I did get some for the roof. Here is an overview of it now:
From the inside:
Each side is 5' from peak to eve and 14' from end to end. The sheets come in 10' x 3' lengths. So I used 5 sheets to cover the roof with a 6" overhang on each end. This worked out extremely well.
Now there is obviously a gap where the two sheets meet at the peak. So I bought a 6th sheet and cut lengthwise strips to cover the gap.
The next two pictures show me installing this piece. My brother got me up in the bucket of the Bobcat in order to reach the top of the roof.
Here you can see the strip that runs along the peak to cover the gap. A nice thing about the way this worked is that it adds ventilation all along the top.
I also moved my cactus into it for the year. I snapped a pic as I was being lowered in the bucket. You can see the cacti on the shelves. You'll have to excuse all the junk around it. I still have to put the film around the sides and will clean up after that. Then I'll post new pics.
As a final note. The polycarbonate material is hard to find around here. I ended up puchasing it from an Amish dude down the road. He had it in stock! The sticker on it said "Made in Northern Ireland".
Who would ever think that someone would buy a product of Ireland from an Amish guy to grow cacti in Minnesota?
Anyway, I really wanted the twin wall stuff that has the little squares when viewed in cross-section (like Darryl'), but that stuff is hard to find around here and I didn't feel like paying $130 just for the shipping. So I went with this stuff. It is practically indestructable. You could drive a truck over it and it would be just fine.