OBC Northwest Greenhouse Installation Instruction

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OBC Northwest, Inc.

Nursery & Greenhouse Supplies

Phone [phone] Local Phone [phone] Fax [phone]

OBC GREENHOUSE

CONSTRUCTION MANUAL

INSTALLATION INSTRUCTIONS

P. O. BOX 759 • 1076 S. W. BERG PARKWAY • CANBY, OREGON 97013 •

Email: [e-mail]

OR#127055 WA #OBCNOI 022CR

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IMPORTANT

GREENHOUSES MANUFACTURED BY OBC NORTHWEST, INC.

ARE NON-CODED STRUCTURES AND OBC DOES NOT EXPRESS

OR IMPLY THAT THEY MEET ANY UNIFORM BUILDING CODES.

THIS STRUCTURE IS NOT RECOMMENDED FOR USE IN HEAVY

SNOW OR HIGH WIND AREAS.

Receiving Shipment

Check the quantities of packages and pieces matching the bill of lading.

Make note of any damage or missing parts. Claims for shortages or damage

found after the delivery must be made within 10 days from the date of receiving

your greenhouse.

BEFORE YOU BEGIN

Please read these instructions and review the parts list that you received

with your greenhouse shipment before beginning the greenhouse construction. If

you should have any questions concerning these instructions, materials list, parts,

etc., please call OBC Northwest, Inc. toll-free at 1-800-477-4744 or local (503)

266-2021. We will be glad to assist you with any questions you may have.

OBC Northwest, Inc. is a licensed contractor and can construct your greenhouse for

you. Please call for more information.

Oregon Lic. #127055 Washington Lic. #OBCNOI022CR

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TOOLS

TOOLS AND EQUIPMENT NEEDED FOR GREENHOUSE CONSTRUCTION

• Wooden Stakes

• Braided Nylon Cord

• Transit Level

• 100’ Tape Measure

• Batter Boards

• Plumb Bob

• Screwdriver

• Post Hole Digger or Auger

• Drill with 5/16” drill bit

• Hammer w/ duplex nails

• Adjustable Wrench

• Fence Post Level

• Felt Tipped Marker

• Concrete for setting Leg Posts

• Side Board Lumber—2” X 4” or 2” X 6”

Pressure Treated painted with latex fence post

paint to prevent burning of film over time – Four

times the length of your

Greenhouse OR- 5 inch Rollform

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PARTS LIST

PIPE STRAP

BRACE BAND

3/8” CARRIAGE BOLT & NUT

5/16” HEX BOLT WITH WASHER AND

NUT

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#14 TEK SCREW

#12 TEK SCREW

TEK SCREW WITH WASHER

#14 WOOD SCREW

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#14 WOOD SCREW WITH

WASHER

SUGGESTED SITE PREPARATION:

Grade and Prepare the Building Site

• The greenhouse should be set up so the length of the house runs north
and south. This allows for the most sunlight to reach the plants.

• Remove the grass and debris down to solid soil.

• Locate building corners and set grading stakes 3 feet beyond building

corners.

Layout and Square the Foundation

• It is very important to lay out your greenhouse with all four corners square
with each other. You can do this by using the Pythagorean Theorem to
determine the squareness of the plot. If you take the greenhouse length
squared and add it to the greenhouse width squared, then find the square
root of the total, it will give you the distance of your greenhouse from
corner to corner.

Example:

A² + B² = √C

( 30’x30’) + ( 40’ x 40’ ) = 2500

√2500 = 50

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For a 30’ x 40’ greenhouse, the width squared would be 900’ (30’ x 30”) and the
length squared would be 1600’ (40’ x 40’). The total of these two measurements
is 2500’. The square root of 2500’ is 50’ (50’ x 50’ = 2500’). Therefore, your
diagonal measurement would be 50’ for a greenhouse of this size. See attached
chart for sample measurements.

WIDTH

LENGTH

DIAGONAL

MEAS.

WIDTH

LENGTH

DIAGONAL

MEAS.

20'

30'

36' - 5/8"

20'

95'

97' - 1"

20'

36'

41' - 2 1/4"

20'

96'

98' - 3/4"

20'

42'

46' - 6 1/14"

20'

102'

103' - 11 1/4"

20'

48'

52'

20'

108'

109' - 10"

20'

54'

57' - 7"

20'

114'

115' - 8 7/8"

20'

60'

63' - 3"

20'

120'

121' - 7 7/8"

20'

66'

68' - 11 1/2"

20'

126'

127' - 6 7/8"

20'

72'

74' - 8 3/4"

20'

132'

133' - 6 1/8"

20'

78'

80' - 6 1/4"

20'

138'

139' - 5 1/4"

20'

84'

86' - 4 1/8"

20'

144'

145' - 4 5/8"

20'

90'

92' - 2 3/8"

WIDTH

LENGTH

DIAGONAL

MEAS.

WIDTH

LENGTH

DIAGONAL

MEAS.

24'

30'

38' - 5"

24'

95'

97' - 11 3/4"

24'

36'

43' - 3 1/4"

24'

96'

98' - 11 3/8"

24'

42'

48' - 4 1/2"

24'

102'

104' - 9 3/8"

24'

48'

53' - 8"

24'

108'

110' - 7 5/8"

24'

54'

59' - 1 1/8"

24'

114'

116' - 6"

24'

60'

64' - 7 1/2"

24'

120'

122' - 4 1/2"

24'

66'

70' - 2 3/4"

24'

126'

128' - 3 1/4"

24'

72'

75' - 10 3/4"

24'

132'

134' - 2"

24'

78'

81' - 7 3/8"

24'

138'

140' - 7/8"

24'

84'

87' - 4 3/8"

24'

144'

145' - 11 7/8"

24'

90'

93' - 1 3/4"

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WIDTH

LENGTH

DIAGONAL

MEAS.

WIDTH

LENGTH

DIAGONAL

MEAS.

30'

30'

42' - 5"

30'

95'

99' - 7 3/8"

30'

36'

46' - 10 1/4"

30'

96'

100' - 6 7/8"

30'

42'

51' - 7 1/4"

30'

102'

106' - 3 3/4"

30'

48'

56' - 7 1/8"

30'

108'

112' - 1"

30'

54'

61' - 9 1/4"

30'

114'

117' - 10 1/2"

30'

60'

67' - 7/8"

30'

120'

123' - 8 1/4"

30'

66'

72' - 5 7/8"

30'

126'

129' - 6 1/4"

30'

72'

78'

30'

132'

135' - 4 3/8"

30'

78'

83' - 6 3/4"

30'

138'

141' - 2 5/8"

30'

84'

89' - 2 1/4"

30'

144'

147' - 1"

30'

90'

94' - 10 5/8"

• When you are finished outlining your greenhouse foundation, the
diagonal measurement from corner to corner should be the same in
both directions.

• Set batter boards approximately 3 feet (or adequate distance for
auger clearance) back from corners in each direction (fig 2). All
string lines should be set at equal heights above grade (3 – 5
inches) for 30’ wide GH w/3’ leg assembly. Variation in this

dimension will ultimately affect building height.

Marking Holes and Strings

• With a 100 foot tape, measure and mark string and ground with paint at
center location for each leg.

• Re-check your measurements

• Remove strings and dig holes 10 inches in diameter and 2-½ feet deep.

For 2-3/8 and 2-7/8 dig holes 12” to 18” in diameter.

• Restring and offset the string line ½ of the diameter of the legs. This string
line now represents the outside edge of your greenhouse legs. (DIAGRAM

#1)

• Next, mark each leg at string level. On standard houses this will be at the
predrilled hole.

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DIAGRAM # 1

Setting Legs

• Prepare legs by taping ends to be set in concrete. This will prevent legs
from filling with concrete and interfering with bow installation.

• Fill holes, one at a time, with a thick mix of concrete (2 ½ to 3 ½ inch
slump). Holding the post level on the leg, slide the leg into the concrete
slowly while checking plumb. Be sure you are on the correct side of your
offset string! Sink leg until leg mark (or predrilled hole) is level with string.
(Not deeper than 24”). Holes must face to the outside of the greenhouse
side walls. Double check plumb. Repeat for all legs. Let concrete set for
24 hours before lifting bows into place.