Roof ballast block
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United States of America Patent
Stats
-
Aug 20, 1985
Grant Date -
N/A
app pub date -
Aug 5, 1983
filing date -
Aug 5, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A roof ballast block having generally rectangular top and bottom faces and two parallel edges bevelled at substantially identical angles of 12.degree. to 23.degree. from the vertical, the remaining two edges being substantially vertical, the block having a plurality of parallel spaced channels in its bottom face and being characterized by a density of 85 to 155 pounds per cubic foot, a compressive strength of at least 2500 psi, a flexure strength of at least 300 psi, and a capability of undergoing at least 100 freeze-thaw cycles without cracking.
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