Airtight greenhouse?

by Jan Broda
(Maine)

Hi! I moved an outdoor cedar hot tub enclosure (minus the roof which caved in under snow load) into my basement. The four walls form an intact rectangle about 10 feet x 14 feet, with operational windows and screens plus a tight fitting door.

My concern is that there is no roof to create a sealed-off environment. Should I tape Mylar across the top to create a roof? Thank you, JB

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Airtight greenhouse?

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Sep 17, 2009
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by: Larry, Webmaster

I do not think there is a need to have an airtight growing room in your basement, JB. Leaving the roof off will let air circulate and allow beneficial bugs such as spiders to get to your plants and provide a little protection from harmful bugs (and you will get harmful bugs in there even in the basement).

Leaving the roof off will also allow excess heat to dissipate and keep the humidity a little lower so diseases like damping-off and powdery mildew will not take hold.

The only reason I can think of for putting a roof on and making the structure airtight would be to retain heat in the winter months but this one advantage is outweighed by the disadvantages listed above.

Simply lighting a candle will increase heat in the 4 wall enclosure up to 10 degrees F if you need more heat.

So in my opinion, build the 4 walls of the structure, and floor if there is one, but leave the roof off.

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