Greenhouse planter boxes


Old 07-25-07, 11:21 AM
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Join Date: Jul 2007
Posts: 2
Question Greenhouse planter boxes

We have just built a new greenhouse and are now getting ready to build planter boxes for it.....we are using 3/4 inch plywood and want to line the boxes with something to protect the wood from moisture....we are thinking about fiberglass.....are there other materials that might work as well?....any suggestions out there for us?

We live in central Alaska and are putting radiant floor tubing through the boxes that will be filled with antifreeze and circulated through the boxes (with a circulating pump) to heat the soil and then the tubing will zigzag across the back wall of the greenhouse to be heated by the sun. We have 5 gallon black buckets of used antifreeze that will go under the planter boxes to help hold heat in the greenhouse at night.

We don't plan to start heating the greenhouse for use until March as that is about the earliest we will have temperatures that hold steady above 20 degrees at night.....suggestions for heaters would be welcome too. Thanks
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Old 07-26-07, 05:06 PM
Join Date: Aug 2000
Location: USA
Posts: 15,834
You can line with plastic. See here:

You can find greenhouse heater info and calculator for determining size of heater here:
Old 07-28-07, 01:26 PM
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Join Date: Jul 2007
Posts: 2
Wink Thank you!

The material mentioned in the article looks much easier (and cheaper I'm sure!) than trying to mess with fiberglass....we will definitely look into it and see if we can find some.

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