Allotment Gardening Advice Help Chat
Growing => Growing in Greenhouses & Polytunnels => Topic started by: rowlandwells on December 16, 2011, 18:52
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for some years now i do the summer ritual of covering the outside of the greenhouses with green poly shading its like a mesh so it let some light in but its a pain if its windy to put on but it does help to protect the plants from UV rays i open the windows but it does tend to get quite warm in there when i am away at work :ohmy:
i always get cross when putting the shading on the greenhouse because it gets tangled up on the glazing clips same when removing it but its a must because without that plants would certainly burn up on the benches >:(
so I've decided to try another way by putting the shading on the inside of the greenhouse using alliplugs i know it mite take a little longer and a bit more fiddly to do it this way must persevere
if anyone out there has any advise about shading greenhouses any advise would be most welcome :) :)
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use bubblewrap to line the inside and leave it up all year.
A bit of 'double glazing' for the early stuff and the bubbles stop scorching in summer ;)
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The problem with putting shade netting inside the Greenhouse is that it doesnt reduce the temperature. Once the suns rays have come through the glass the damage is done.
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use bubblewrap to line the inside and leave it up all year.
A bit of 'double glazing' for the early stuff and the bubbles stop scorching in summer ;)
Seconded, it does help negate high and low temps.
The only downside is that you have to replace it every 3 or so years as the UV light turns the bubble wrap to confetti.
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many thanks for your replies sound advise will give it a go RW
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I would go with the bubble wrap idea.
Don't leave it in place for more than 2 years as it does break up into tiny pieces and is a nightmare to remove it all from the ground.
It's not expensive either so replace it every 2 years, it also gives you more than the mesh does as it adds insulation and extends the growing season at both ends. :blink:
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I used debris netting on the outside of mine this year and it worked for me. Throw it over the top and then clip it down with some large metal clips a bit like clothes pegs only bigger.
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Its a while ago since the last post but I have been thinking about this problem too and just stumbled across this one. I am at work all day and worried the greenhouse will get too hot as I can't leave windows open in case it pours down.
I was thinking of making some small black out type blinds for the inside and just putting them over the area that gets the strongest of the sun during the middle of the day. My greenhouse has sun all day long.
Would this work?
Wendy
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I am at work all day and worried the greenhouse will get too hot as I can't leave windows open in case it pours down.
?? Lots of us leave doors and vents open during the day, then return to close at night. The rain won't be a problem...
sav
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I have 2 roof vents and 1 louvre (spelling?)
The door remains closed but the roof vents will be on auto openers and the louvre will be on an auto vent eventuall too, but at the moment it will be left open all day and night.
More than enough ventilation and there will be an adition of shading if neccesary, which in my case will be bubble wrap to give me an extra month of growing at the beginning and end of the year.
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following your comments I've had to re-think the matter of shading i know its a pain and it takes the best part of a day to put shading nets on the outside of the greenhouses there is also quite a lot of swearing at the time of fixing :mad:
but i have to say it does work i run the shading from the roof down the sides that shades the glass down to the staging securing the net with string onto an anchor point we also leave the windows open throughout the season
we have used the same green plastic netting for about 6years and its still going strong :)
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We have used white wash stuff in the past, and debris netting the white wash stuff was awful to get off. The netting is not to bad to use at all with a second pair of hands.
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I've tacked lengths of windbreak netting to 1m battens at either end - then lift these over the roof ridge with a long pole. 12' greenhouse shaded in under 5 mins.... never blown off, i guess because the netting is so porous
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that's a dam good idea savbo i'm going to try that with my net this time will let you know how i get on with it :)
many thanks for that RW
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Last year was my first with a greenhouse and it didn't therefore present that many overheating problems ::), although the single automatic vent on its own wasn't enough without the door open on a few days.
I'm following all this with great interest - still hoping that someone has found a way of installing something adjustable (like a roller blind), insulating (like bubble-wrap) which doesn't potentially stop the window opening or otherwise impede air flow.
Got a feeling I might be expecting too much and am in for a long wait! :unsure: :nowink:
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if its any use jayg when i put the shading on our greenhouses i open all the widows and doors and leave them open through the season as the season gets hotter i usually remove a pain of glass at the end of the greenhouse to help the air circulation through the greenhouse
never had any problems doing this as for you roller blinds it would be a god idea to install like the commercial growers who have the same idea on a automatic basis worked on the temperature of the greenhouse
but something tels me it mite be costly to install a manual blind operation and of course the material would need to be like the commercial growers use to withstand the strong UV rays
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This year is my first year with a greenhouse too and I am a little worried that it will overheat. I guess all I can do is call by on my way to work and open all the vents and then close them later when I go to water.
Otherwise of course I was considering putting up a couple of roller blinds to block out a little of the sun.
Wendy
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Nobody seems to have mentioned whitewash onto the glass! Is there something wrong with it?
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They did here:
http://chat.allotment-garden.org/index.php?topic=87026.msg981980#msg981980