Greenhouse build progress
We have been working outside this week and thought we would provide an update on the greenhouse build progress. This greenhouse is being built over our 95 ton heat sink and is part of our geothermal heat sink greenhouse project. We are still a long ways off from having the the heat sink operational. You can see what we have accomplished in this picture.
Arch supports installed
Near the peak of the arches you can see a horizontal support. They are on all the arches except the two on the end, These supports will provide rigidity for the arches under heavy winds and snow loads. We don’t get lots of snow here in NW Missouri but we do generally see some every year. If we received lots of snow it would have been necessary to go with a different style of arch to support a heavy snow load. They’re held in place with a self tapping screw to keep them from moving.
Installing greenhouse hip boards
Both sides of our greenhouse will get a hip board and baseboard installed. You can see the partially installed hip board on one side of our greenhouse in the picture above.
In this picture you can see how we are securing the hip board to our arches. Notice the Tapcon screw installed through the top bracket. One bracket at each arch will get a Tapcon to prevent the hip board from moving. Each arch, with the exception of the two end arches, will have the hip board secured in this fashion. The two end arches will have a 3/8 inch hole drilled through the board and arch. A carriage bolt will be used to secure the hip board at each end.
We used a 3/8 impact adapter with a socket and our impact driver to insert the lag bolts.
What comes next
After both sets hip boards are up we will install the base boards. Once those are on we will need to do a little back filling with dirt to help keep critters from getting inside.
After the base board work is complete the ends will need to be closed up and the door and door frames built. We will be framing in both ends with treated lumber that was reclaimed from our in the garden greenhouse. We are still sorting out the details of the end walls.
After the end walls are complete the grow boxes will be built and installed. They will be filled with sawdust and sand, mixed at 75 percent sawdust. We likely transplant seedlings into the grow boxes before pulling plastic.
The double layer of greenhouse plastic will be installed this fall once the temperature drops to around 60 degrees.