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Old 02-22-2011, 09:07 PM
tropterrarium tropterrarium is offline
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Join Date: Jul 2010
Location: Los Angeles
Posts: 553
Mini Greenhouse construction
Default Mini Greenhouse construction

Here's a short intro to the mini greenhouse project I have going. I call it the greenhut (4x9'). So everything is wrong about this GH, too small, wrong orientation (SW facing). So I will turn that into an advantage by growing shade loving minis.

Here's what has been happening. The GH is adjacent to the house, still on the slab. Here in Southern California, there is no issue with frost, so I could pretty much ignore ground insulation. The ground was not 100% level, so I put a round of cinderblocks (8" tall, 6" wide) set in concrete, and meticulously leveled. Between the cinderblocks at the bottom, I put 1/2" sprinkler tubes, removed them once the concrete was half-set, so those are drainage holes in or out. In the middle of the GH is a pre-exising exterior drain.

Mini Greenhouse construction-110210_095543-jpg

In the right front corner there is a coil of rubberized electrical cord for use in the GH silicone sealed into the L-junction; 12 gauge solid wire is used in conduits. It is going through metal conduit to a dedicated 20 Amp breaker. Breaker was professionally installed, the rest I did myself. There will be 4 GFI outlets. There are a couple of larger tubes in the cement adjacent to the electrical conduit. Those will be used for RO water lines in/out of the GH. The open spaces of the cinderblocks were filled with styrofoam peanuts then concreted over. It reduces the amount of concrete used, gets rid of peanuts, and insulates. Win-win-win.

Mini Greenhouse construction-110210_095453-jpg

Water supply for the Mistking misters is from an external faucet, 3/4" pipe to 1/4" RO reduction fittings with ball valve to reduce pressure. It goest to a DI filter (RO wastes too much water, and water is precious commodity here in Southern California), stored temporarily in an old terrarium, insulated with styrofoam (see picture above on right). The old aquarium will have a float valve to limit the water level. Here the tap water can gas off anything that is left in the water after DI.

Mini Greenhouse construction-110218_092630-jpg

The GH is a kit from Santa Barbara Greenhouses, redwood and glass, the redwood sealed with a marine sealer and then twice coated with a gloss finish. That was hideously expensive (~400$ for paint!) but is worth while for the gorgeous look and the longer durability of the whole GH. Compare unfinished below and finished above.

Mini Greenhouse construction-110210_095630-jpg

On top of the cinderblocks there is a 2x4 frame, wood treated with marine sealer, attached to concreted in bolts, next to it you see assembled sections to be bolted together

Mini Greenhouse construction-110218_092458-jpg

So much for today. Will post more pictures as I get to it.

What I am still looking for are fans for internal air circulation. Any suggestions? Went to Frys today, but Fans are not "in season"! what a concept.
Also looking for large manzanita branches. Buymanzanita.com is not responding to e-mail, so not sure they are still in business. They charge about half of what the other two do, so would be preferred choice.
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cinderblocks, concrete, marine, sealer, water, construction, greenhouse, mini


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