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Follow all current and applicable codes, such as ASCE 7-05. The ballast blocks or roof pavers should have dimensions of 16” x 8” x 4” with a weight of 27 to 33 lbs. Pavers should have a minimum net area compressive strength of 3000 psi for freeze/thaw resistance or must comply with ASTM Designation C1491 – 01a.
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Wind and Structural Engineering