Another one of our large projects, is building an aquaponics greenhouse.  This is in line with our goal of creating an energy efficient ecosystem.  Since we are utilizing parts that we already had, you could technically consider it a retrofit.  At the beginning, yes, I would have agreed that the word retrofit was accurate, but not now.  Really, that is just what sparked the design, but from there it is totally custom.  We already had a small greenhouse frame whos footprint was basically square.  To make this greenhouse, we took the two halves and placed them all on the same side to make a long, one-sided greenhouse.  The back is attached to the barn via a room that will eventually house the aquaponics.  With the ribs on the southern side and the back wall being reflective, there will be plenty of light.  In the hot summer months, we will still need to use a shade cloth.  If you aren’t familiar with what a shade cloth does, it filters out a certain amount of the sun and partially shades what is underneath.  They are not used in the winter months here, only in the summer.  It doesn’t give total shade either, so plants still grow under it.  The light is simply filtered, and the temperature under it is cooler.  They come in various filtering percentages.

In this first picture, you can see the ribs and begin to see the overall plan.  The back of the greenhouse is not built, but the frame is there.  Redell (one of our nephews) and Doug are putting decking on it. The plan calls for a loft area above where Redell and Doug are working, but we are not to that stage yet. The clear part of the greenhouse will be where the aluminum poles are angled down to the ground.  Those are what we are calling the ribs.  We have several permaculture ideas incorporated into this design.  One of the ideas is an underground pipeway that will create airflow into the greenhouse from a low lying and shaded area on our farm.  The pipes begin in the cooler, shaded area that is located at a lower elevation than the greenhouse.  These pipes are buried underground all the way from there to the inside of the greenhouse to create a draft.
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Here you can see the process, where the trench was dug with a trackhoe, and then Caleb (our intern) and Doug laid the pipes into the trench.  The trench is really quite long, so it was a lot of work and a lot of pipe.  You can kind of get the idea of the transition from the lower elevation to the higher elevation in the second photo.  Permaculture techniques use naturally occurring things like this transition from lower to higher, and the difference in the temperatures between the shaded area and the greenhouse to achieve benefits like airflow without the use of electricity.