Quote:
Originally Posted by bananafarmer
The cheapest way is to apply chalk on the outside of the greenhouse, mix it with water and apply it. It is wihite and has a great effect.
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I like this method for reducing the amount of light passing through an existing translucent roof.
However, if you are building a greenhouse in a temperature environment -- then it would be cheaper (per square foot) here in the U.S. to purchase 30% shade cloth.