Roof ballast block

Details Roof ballast block Roof ballast block

1983-08-05

1985-08-20

Kelly, Donald G.

Static structures (e.g., buildings)

Disparate sheet lamina between exposed surfaces of wall,...

52302, 52409, 52608, B32B 314

Patent

active

045355797

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.

REFERENCES:
patent: 1558129 (1925-10-01), Warren
patent: 2192458 (1940-03-01), Swenson et al.
patent: 2671441 (1954-03-01), Harris
patent: 3387420 (1968-06-01), Long
patent: 3892899 (1975-07-01), Klein

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