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Shorter Support Structure

(for 42" modules)
Used when distance between top of cross support and 1'x1'x3/4" pad is 12" to 21"


2    4x4 Support Posts (Length determined by height requirements of ramp
2    1'x 1' by 3/4" Treated Plywood Pads (Will be screwed to bottom 
                of 4x4 with three 3" deck screws)
2    2x6 by 49 1/2" Cross Supports
4    2x4 Trimmers (Length equals distance between bottom of cross
                support and plywood pad.) (Trimmers will be screwed to 4x4.)
4   3/4"-thick Treated Plywood Gussets (see drawing for dimensions) 
                (Gussets will be screwed to trimmer and cross supports 
                with seven screws per gusset.)
2    1/2" x 8" Carriage Bolts with nuts and washers (9/16" holes
                 will be drilled in support structures for these bolts)

[exploded diagram of support structure]

Construction Notes:

  1. During construction, determine the length of the 4x4s by measuring from a string line that equals the height and slope of the ramp you are building.
  2. A standard guardrail height of 36" can be obtained by having 34" of 4x4 extend above the: ramp surface. Compute the length of each 4x4 upright by measuring down from ramp surface to plywood pad on the ground and add 34" to that number.
  3. The two legs are often not the same length due to uneven terrain.
  4. The cross supports are an extra 1/2" long to allow space to easily set modules in place.
  5. During construction, be sure that 4x4s are plumb and cross supports are horizontal before installing carriage bolts, trimmers, gussets and bracing. Temporarily attach cross supports with screws to allow for adjustments and place bolts, bracing and gussets after all modules are in place.

Onsite construction assembly procedures are provided in the following pages.
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