dooley
Official Garden Turtle
Joined: 03 Jul 2005
Posts: 3102
Location: Arizona, U.S.A (Map)
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| Posted: Mon Feb 27, 2006 3:11 am Post subject: Does anybody know? - Thickness of greenhouse plastic |
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Today, we went to find prices on plastic for our lean-to greenhouse. Does anybody know what mil the plastic should be. They have 4 mil and 6 mil. Both seem thick enough. Brian wants to know if it should be 4 mil which lets in more light or 6 mil which is thicker and would protect more from the cold. It gets down into the 20's at night right now, but with March it will gradually warm up. The last average frost date here is May lst. but with our prediction of warmer than normal temperatures it may come earlier. Do we need more sunlight or more warmth. I could put a heater in it if need be. I know that the 20's shouldn't last much longer but what about the 30's. Which should it be, 4 mil or 6 mil. dooley
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eileen
Moderator & Resident Taxonomist
 Moderator
Joined: 07 Feb 2005
Posts: 10348
Location: Scotland (Map)
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| Posted: Mon Feb 27, 2006 12:49 pm Post subject: |
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Dooley I'm no expert but the usual is 4ml as far as I know. I think 6ml only really gets used when the greenhouse doesn't get much sun. I hope someone else can help you out better than I can though.
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Capt Kirk
Thank a Veteran today!
Joined: 10 Sep 2005
Posts: 1289
Location: Ohio, USA
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| Posted: Tue Feb 28, 2006 12:05 am Post subject: |
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I would think it would also depend on how much wid you get. The 6 ml would be better if you get much wind.
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i love bugs
The Weatherman of Craggy Island
Joined: 02 Dec 2005
Posts: 483
Location: Dublin Ireland
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| Posted: Tue Feb 28, 2006 2:21 pm Post subject: |
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Light is very important , if they both seem the same I would go for the one that lets in more light . However I agree with the Capt. if wind is a factor get the heavier one . If frost is a problem you can always cover your plants inside the tunnel with garden fleece or old newspapers at night and this will give them double protection  Bugs
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dooley
Official Garden Turtle
Joined: 03 Jul 2005
Posts: 3102
Location: Arizona, U.S.A (Map)
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| Posted: Tue Feb 28, 2006 4:43 pm Post subject: |
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Sometimes wind is a factor, but Brian has this thin wire netting he's going to put over it. The question is more about sun. We have really bright sun and sometimes it gets too hot. He's making it so I can open it to let out heat, but he was wondering if the heavier mil would dull some on the sun without hurting the amount of light the plants need. Dooley
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alleyyooper
Showing Great Promise
Joined: 18 Jul 2005
Posts: 358
Location: Michigan (Map)
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| Posted: Wed Mar 01, 2006 2:25 pm Post subject: |
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A good read::::
http://www.backwoodshome.com/articles2/sanders67.html
For green house heating try plastic 55 gallon barrels painted black and filled with water. The black color asorbs heat during the day and releases it at night. How many barrels required depends on how big the green house is.
 Al
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dooley
Official Garden Turtle
Joined: 03 Jul 2005
Posts: 3102
Location: Arizona, U.S.A (Map)
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| Posted: Wed Mar 01, 2006 3:39 pm Post subject: |
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Thanks! We're thinking we'll go with the 6 mil. He's building it in segments so we'll be able to take it apart and store it after we have our plants started. Dooley
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