Posted 11-30-2004 at 10:45:33
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I just read your post down below about looking for info on greenhouses. I dont have one but Mrs Peanut and I have looked into them many many times. We actually bought a book that gets into some great details about greenhouses and how to construct them.
The link you posted showing the 10' x 27' greenhouse seems a little expensive to me. That one uses galvanized steel posts for support ... which is a good thing. The galvanized steel is lightweight enough to work with but sturdy enough to last. The outside plastic covering is a little weak though. The 6mm plastic probably wont last more that two years. Any plastic (no matter how thick/thin) is considered a temporary greenhouse covering. Yes it is less expensive than glass or hard plastic panels but weather and sunlight really beats up flexible plastic. The door with a built in shutter is a good thing but the structure needs some way to circulate air. The shutter in the door is perfect for one end but the opposite end needs a shutter or a motorized fan. The fans are considered the best because you can connect them to an on/off switch that is controlled by a thermostat.
The floor is something you have to also consider. The best floor is concrete with a slight slope for drainage. Obviously that can get expensive though. Gravel or bark is considered the next best. Good drainage and easy to maintain. Dirt and grass are not that good because your drainage can be poor depending on the slope of the area you build on.
Electricity and running water are considered a must-have for a greenhouse in my opinion. The air circulating fan and lights use the power. You can also hook up heating pads under your seed starters so you can germinate seeds while it is still winter outside >>> makes for early tomatoes and red bell peppers. Hooking up a drip irrigation system inside is simple and fairly cheap. You just need to make sure your connections are tight and the drip flow is set right. Otherwise your greenhouse might turn into a swimming tank.
Shelves and workbenches are super important in a greenhouse. You need the counter space to work and to set your trays. Using small framing lumber is the inexpensive way to do this. 2x2's or 1x2's will work as long as you have the proper support for the weight you plan on having sit on the shelves.
Post back if you have specific questions. I'd be glad to look up anything in the book if you want.
Personally, I like the idea of a 2x4 framed wall structure with frosted glass panels on the roof and thin hard plastic panels for the sides. The frosted panel is important for the roof as the sun light will be properly difused and not bake the plants. A vented door and a vent fan are a must. I would use gravel as the floor. 10x27 is a really nice size >>>> big enough to keep lots of stuff in.