Bmoser I appreciate the feeback but I have 1 layer of 6 mil film and last year I did not like the light levels in my wood framed greenhouse. Some tomato flats had short plants in the middle and larger plants at the end. My greenhouse has an east/west angle to capture the most sun from late winter early spring when I need it the most. I just finished painting all the wood white but I don't understand how the light levels are not where I want them to be when others seem to have 2 or 3 layers on their greenhouses and get plenty of light. Don't get me wrong the light levels are not horrible. I would say they are 15% less overall than what I want. I am hoping white ground cover over my brick floor and white wood over non painted wood is going to make the difference. If I switch to polycarbonate panels though I definitely don't want to be risking using a pool cover and damage them since they are so expensive.

Hello, bmoser! I am coming a little late because I had first to translate your message. Thank you very much for your quite clever system of attachement! Here my explanations: "all clips are fixed" would mean, that the plastic-sheet has been put on and attached with metallic clips on the front-arches. Then we had to secure the plastic on the ground level before "burying" the ends into the trench. And this securing was the main factor of the problem. I admire your system although when it is not the same as the mine,(I need not wiggle wire section), but the your's is very, very clever and handsome-like! We have metallic strips in the same dimension as you have your firring strip, but in the forme of an "U", and the point of difficulty was, at what side the plastic has to be come. It was right when putting it at the métallic-side, whereon has to be attached a plastic rail together with a middle plastic-strip.This system is able to support the whole side of the plastic-cover-sheet. I am wondering if you understand my bad description. But just this to say that it was wrong - and like this we did in the first time! - to slide the plastic-sheet between the plastic rail and the middle strip. That was cutting the plastic just like a cutter does! Fortunately we could repair this error with a special scotch-sheet for plastic-tunnels and correct our strong mistake. Thank you once more for your helpful reply. And I like to learn more from other unknown system for us! Gratefully, lucy

Yes, you will still get heat build up, possibly more. At least I do in the spring. The sun is at a different angle and not as intense in the winter but it will still magnify the sun's heat. I was thinking about the end of Nov. or even later for putting on my solar cover. Because I think we will not get frost til then. But because of plans for other things I will need to get it on before Nov. 18th. I am planning on putting the inside plastic up this weekend (along the back north walls.) so I can start slowly moving my plants in.

I've been peeking in now and then during the market season, not much time to follow-up on anything then as you all know. My first GH was put up in 1998 (GH film 2 layers 50'x100' folded in half), sold that farm in 2004 and moved the GH with us to our new farm, put new GH film (2 layer) on then. Sure seems to me the GH film was much better quality back in 98, now it's just like everything else, cheaper made. This was the same kind/brand of GH film both times. This same GH was moved to a new location on our farm (closer to the house) and reused the same GH film that was on it. To this day that same GH film is still in pretty good shape. I would never use construction plastic, GH film is worth the money. DEB