CONCRETE
GRAVEL
CONCRETE
GRAVEL
GROUND
GROUND
Foundations
Check your local building codes for foundation requirements in your area.
CONCRETE FOUNDATIONS
When you prepare the concrete foundation, the size should be 1” longer and wider than the
greenhouse’s outside dimensions. One option is to fasten a treated 4” x 4” wooden sill on top of
the foundation. This sill is the exact outside dimensions of the greenhouse.
PRE-TREATED WOOD FOUNDATIONS
A greenhouse that is approximately 100 sq. ft. (9.3 m2) can be fastened to a 4” x 4” pre-treated
wood timber foundation. For larger greenhouses, a 6” x 6” wood timber foundation is
recommended. These timbers are placed in a 4” (10 cm) deep and 8” (20 cm) wide gravel bed.
Wood timbers can be stacked to increase the height of the greenhouse.
One advantage of the wood
foundation is that it is not classified as a permanent structure. Therefore, if you move, the greenhouse can be
dismantled and moved to another location.
A SQUARE AND LEVEL FOUNDATION
Check the width and length of the foundation’s outside dimensions. Then, square the foundation
by measuring diagonally from opposite corners in the form of an “X”. Next, use a
long
carpenter’s
level to check and adjust the foundation until it is level. Finally, measure where the door will be
placed (in most cases it is 34
1/2
” wide). Mark these measurements on your foundation.
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T R A D I T I O N A L S E R I E S S T R A I G H T M O D E L • G R E E N H O U S E I N S T R U C T I O N S
CONCRETE FOUNDATIONS
PRE-TREATED WOOD FOUNDATION
Foundation Styles
