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Page 7For technical questions, please call 1-800-444-3353.Item 47712
Concrete Slab Foundation
Constructing a Wooden Sill
1. The greenhouse must be attached to a
wood sill, and not directly to a concrete slab.
Use four4″wideby2″thick wooden boards
(not provided) to construct a sill.
2. Cut the four boards to the proper dimensions shown.
3. Place the four boards to form a
rectangle on a level floor surface.
4. Exact dimensions may vary slightly.
Lay the base components out together,
square them, then take actual measurements.
Both diagonal measurements, from outer corner
to outer corner, should be 123
3
/
4
″ each.
5. Secure the boards together at the corners
using wood screws (not provided).
Figure E: Wood Sill Dimensions
Attaching the Sill to the Concrete Slab
1. A concrete slab foundation upon which the
Greenhouse will be positioned will help to
ensure stability. The slab can be slightly oversize.
2. Drill two
1
/
4
″ holes through each of the four boards.
3. Next, use the two predrilled holes in each board as
a template to mark the points where eight anchor
holes will be drilled in the concrete floor.
Then, temporarily remove the sill.
4. Where previously marked on the
concrete floor, drill all eight
1
/
4
″ diameter,
minimum 4″ deep, anchor holes.
Blow the concrete dust out from the drilled holes.
5. Move the four boards back to the concrete floor
surface, and align all eight predrilled holes in the four
boards with the eight previously drilled anchor holes.
If necessary, level the boards by inserting stainless
steel shims (sold separately) between the boards and
the concrete floor. Do not exceed
1
/
2
″ shim thickness.
6. Secure the four boards to the concrete floor,
using eight 1/4″ diameter anchor bolts of appropriate
length, eight washers, and eight nuts (not provided).
Positioning the Floor Plates on the Sill
1. There are four Floor Plates to
attach to the sill; the Front Floor Plate (17),
the Rear Floor Plate (16), and two Side Floor
Plates (34).(See Figure G on page 8.)
2. Match the length of each of the
four Floor Plates (16, 17, 34) with the appropriate
length of each of the four foundation boards.
Place the Front Floor Plate (17) on
the side that the door will face.
NOTE: Position the four Floor Plates (16, 17, 34)
with their outer edges overhanging the outer edges
of the sill, as shown below. Do not secure
the Floor Plates to the Sill at this time.
Wood Sill
Concrete Foundation
outside
greenhouse
inside
greenhouse
Two 1
1
/
2
” Long
Wood Screws
in each
Front Floor
Plate (17)
Wood Sill
Concrete Foundation
outside
greenhouse
inside
greenhouse
Two 1
1
/
2
” Long
Wood Screws
in each
Rear/Side Floor
Plate (16, 34)
Figure F: Sill Cross Section
SAFETYFRAMEMAINTENANCE FOUNDATION