Green house supplies - Mountain Buzz
 



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Old 01-26-2010   #1
 
Longmont, Colorado
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Green house supplies

So I'm thinking about building a small green house(~8 x ~10). I'll be building my own frame out of steel or Al ( still need to weight out the cost delta). I have found some really nice plastics for the outside but it costs more to ship the stuff than it does to buy it. Anyone know of a local source for this stuff and or suggestions of what to use.

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Old 03-10-2010   #2
 
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SE, Wyoming
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If you want a simple, cheap 2+ season greenhouse, there are good kits on sale, with cost in proportion to durability and usefulness.

I'm building a 3+ season cold-climate greenhouse, 12' x 12' with a wood frame (mostly recycled timber) and high-grade covering from Sundance Supply: double-wall 16mm walls and a six-wall 25mm roof.

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It's got an insulated foundation and a big heatsink under the floor with hydronic tubing to collect and diffuse solar heat.

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A science project for big boys. I love fresh tomatoes.
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Old 03-11-2010   #3
 
Avon, Colorado
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Chip that is sick....

i also have been researching inexpensive greenhouses.

Was gonna build mine, but want to dable with a $700 kit before i go all out like Chip.

Harbor Freight and occasionally Costco have 8'x10' models for about $700 (when the $1000 costco modles go on sale). People have been happy with the Harbor Freight, a few folks have added simple metal cross bracing for wind/snow loads. One o f the products is even double paned Polycarbonate (it might be one of the models on the Costco site).

Sorry i don't have much info on buiding, but there are many websites with Polycarb supplies....it was just too expensive for me at this time to build....buying a cheap kit and retro fitting was much cheaper.
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Old 03-26-2010   #4
 
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SE, Wyoming
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However you go, it's fun.

I built my first greenhouse using wood from old snowmachine pallets and roofed with the ripple stuff and visqueen walls. The windows and vents were scavenged off trailers. I got two big galvanized stock troughs for heatsinks and painted them black on one side and put tops on them for benches.

Even in a viciously cold area (Pinedale, WY) it was good from mid-March- early November, when I'd shut it down and drain the heatsinks.

Just put the main heatsink in the new one:

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It's a 400 gallon stock tank, with foamboard bottom and top, and thermal bubble wrap doubled around the sides. The PEX tubing under the main floor will loop through the water in the heatsink. There'll also be a loop to a solar collector, for winter.

There'll also be four 75-gal black plastic tanks on the rear wall just above this: lots of heat storage, to take advantage of our sunny winter days.
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Old 03-27-2010   #5
 
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at my house, Montana
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Quote:
Originally Posted by Chip View Post
If you want a simple, cheap 2+ season greenhouse, there are good kits on sale, with cost in proportion to durability and usefulness.

I'm building a 3+ season cold-climate greenhouse, 12' x 12' with a wood frame (mostly recycled timber) and high-grade covering from Sundance Supply: double-wall 16mm walls and a six-wall 25mm roof.


It's got an insulated foundation and a big heatsink under the floor with hydronic tubing to collect and diffuse solar heat.

A science project for big boys. I love fresh tomatoes.
Wow, awesome! My back may someday require a greenhouse. We built a large coldframe out of scavanged windows many years ago. It's still going strong, but showing signs of wear. It's big enough I can get into it, but that is squatting and/or sitting, hence the back and greenhouse reference. Concrete block floor keeps it warm, it's just for seedlings not planting. I put a tiny heater in it this time of year. I finally uncovered the garden beds for spring vegi planting, and planted the pepper seeds upstairs under shop lights. It's that time of the year!!!
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Old 03-28-2010   #6
 
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SE, Wyoming
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Lucky for you, up there in the Montana Banana Belt. We still have a foot of snow on the ground, so it'll be a while.

The problem here, with our sunny winter days and extremely cold nights, is the range of temperature. Even in midwinter, a greenhouse with multiwall sheathing (mine has triple-wall sides and a 6-wall roof) can get up to 100F. So I've been trying figure out how to capture and store some of that heat, to even out the temps inside.

I'll start this spring with the passive collectors (black plastic water tanks, dark pavers) and add in the external solar collector, PV panels, and solar-powered pumps this fall, when I fill the big heatsink in the floor. The goal is to be able to grow frost-hardy salad greens and cole crops all winter.

It'd be fairly easy if I had a larger area (more thermal mass) but with a 12 x 12 greenhouse the nighttime heat loss is relatively high. Still, I reckon the hydronic heating in the floor, plus row covers, will keep the soil and boundary-layer air above freezing.
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