Engineered Wood Fiber should be installed at 12"
Rubber should be installed at 4"
for up to a 5' fall height , 6" for over 5' fall height
Sand or Gravel
should be installed at 9"
divided by 1.35 = Gravel Cubic Yards
Rubber Yards divided by 2.65
= Rubber Tons
Rubber Calculator for more
information on Rubber Surfacing
Calculator orLess Area of Posts
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