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Concrete Slab Foundation
Constructing a Wooden Sill
Note: Greenhouse must be attached to
wood sill, not a concrete slab.
1. Sill is assembled out of 4 x 2 thick treated lumber
and appropriate hardware (sold separately).
2. Cut boards to dimensions shown
(See Figure E.) Place them on a level
floor surface to form a rectangle.
3. Square the boards, then take measurements.
Diagonal dimensions from outside
corners should be 122-1/8".
4. Secure boards together at corners
using hardware (sold separately).
5. Drill two 1/4" holes through each
board (See Figure E.)
Attaching the Sill to the Concrete Slab
Note: Concrete slab can be slightly
oversized from sill dimensions.
1. Lay sill on concrete slab, using sill as a
template, mark drilling locations.
2. Remove sill.
3. Drill 1/4", minimum 4" deep, holes in marked
locations. Blow concrete dust out of drilled holes.
Positioning the Floor Plates on the Sill
Match Floor Plates (16, 17, 34) (See page 8)
lengths to frame base edge lengths. Place
Front Floor Plate (17) on door side of base.
Two 1-1/2"
Wood Screws
Inside
Greenhouse
Wood Sill
Item 47712
Front Floor
Plate (17)
Door Side
Concrete Foundation
Figure F: Sill - Cross Section
For technical questions, please call 1-888-866-5797.
Drill 1/4"
Mounting Holes
75-1/4"
Figure E: Wood Sill Dimensions
4. Replace sill, aligning holes. If necessary,
level sill by inserting stainless steel shims
(sold separately) between sill and concrete
floor. Do not exceed 1/2" shim thickness.
5. Secure sill using 1/4" diameter anchor
bolts of appropriate length, washers,
and nuts (sold separately).
NOTE: Position Floor Plates (16, 17, 34) with their outer
edges overhanging sill outer edges. (See Figure F.)
Do not secure Floor Plates to Sill at this time.
Two 1-1/2"
Wood Screws
Inside
Greenhouse
Wood Sill
4"
97"
Rear/Side Floor
Plates (16,34)
Door Side
Concrete Foundation
Page 7
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