Step 7: Build the Roof
This was tricky. I ended up getting siding from an old shed someone had torn down. Any material you use, look for lightweight and waterproof material. Be sure that you have some that will open for ventilation, at least 20-30% of your floor space. You can get by with less if you use a fan for ventilation. Also build the slant roof with at least a 4 degree pitch, otherwise rain may not sheet off well.
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Mar 9, 2009. 1:00 PMReply
Wonderful idea! Kudos to you! I wonder, if you have a window on each end that opens, do you still need roof panels that open, too?
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cheft (author)
in reply to Mar 10, 2009. 9:01 AMReply
More than likely. The box fan I used moves air through the frame, but by no means is circulating the air well enough. The easiest way to cool your greenhouse is by venting the hot air at the top. From the research I used I learned that 20-30% of your floor space should be in vents. In June, there is a huge difference with the roof open, otherwise it'd be 150*F or more in there easily.
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