Greenhouse Effect
PAGE 3 of 4
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Construction, continued

Now it was time to start adding the sheeting.  The 10-foot width of the rolls is enough to cover the top, with enough overhang to attach to the PVC with the duct tape.

Notice that I am working comfortably in my shirtsleeves on a 65-degree day in the middle of November.
Why am I building this greenhouse anyway???  With global warming, who needs it!

 

Here you see the structure with the roof and rear panel sheeting.  I would later decide to add some structure to the back so that that large sheet of plastic have some stabilization...

 

 

Now I had to build the door and finish the front fašade.  I do consider myself pretty handy around the shop, but this turned-out to be the worst door I have ever hung -- but it will work.  I got lazy with the details and sized it wrong, placed the hardware wrong, and didn't fit it well.  However, the gaps that resulted will actually help with venting the greenhouse...

Like I always say, "work harder, not smarter". 

 

The plastic sheeting was taped to the PVC and stapled to the lumber.  Where I live, wind will be the
biggest issue for this modestly-built structre, and indeed, sustained 40-mph winds hit us the day after
this photo was taken.  I taped all of the seams, and anywhere a cut was made or a staple would be
placed in order to reinforce the plastic which would surely be stressed during these wind events..

 

The straw bale used in my glorious autumnal porch display was acquired with the greenhouse specifically in mind.  It will perform as a bench to place plants on, or later, as insulate mulch for the floor and drafty breaches...

 

 I bucked hay for two years while in college.  Somehow, I don't remember the bales being this heavy.

 

Now it's time to make some trips around the yard to gather everyone up.  Well, almost everyone... there are still a few in the yard that will have to be dug-up later.  You can see the "weather station" in these photos, stake-mounted in the straw bale... 

 

All snuggled-in for the winter, kinda like those male emperor penguins.

 

The remote-sensing weather station made a quality addition.  This will help me to see how effective this really is, and help me to know when I may need some supplemental heat if we get any "real" cold this winter...

 

The greenhouse is completed.  If any of you living locally want anything overwintered, let me know.  As you can see there is plenty of room, and the plants like and benefit from company.  It is not intended for truly "tropical" stuff.  Sorry Heidi, but you will have to find another solution for the sago.  However, plants that can withstand temps into the mid-20s on the coldest nights should be fine in here.

I tested the greenhouse on the day it was completed, and indeed it warmed-up quickly inside.  It was a sunny day, but cool, with temps in the mid-40s outside.  However the inside of the greenhouse was at least 10 degrees warmer after just one hour.  As you might suspect, humidity is the most drastic impact.  Outdoor relative humidity here hovered around 30% in the first few days following construction, but never fell below 82% in the greenhouse. 

 

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