Polar Bear III HD 5 Degree Installation Manual
9910034 Rev F
26
Appendix F: Ballast Blocks
PanelClaw does not provide the ballast blocks required to construct the system in accordance with
PanelClaw’s Racking Construction Set drawings. We do, however; maintain a list of potential block
suppliers across the country.
IT IS ABSOLUTELY CRITICAL THAT WHEN PROCURING BALLAST BLOCKS FOR
ANY
BALLASTED ROOFTOP
SYSTEM THAT IT BE MANUFACTURED TO RESIST FREEZE-THAW
AS REQUIRED BY LOCAL CONDITIONS
AND
FOR IT TO BE ABLE TO MAINTAIN ITS WEIGHT OVER THE LIFE OF THE SYSTEM. IT IS STRONGLY
RECOMMENDED THAT INSTALLERS WEIGH SEVERAL BLOCKS ON-SITE TO ENSURE THAT BLOCK WEIGHTS
MATCH THE WEIGHT OF THE BLOCKS SPECIFIED IN PANELCLAW’S RACKING CONSTRUCTION SET
DRAWINGS. BLOCK WEIGHT VARIANCES OF LISTED IN THE CHART BELOW ARE ACCEPTABLE.
BLOCKS WITH A WEIGHT VARIANCE GREATER THAN WHAT IS SHOWN IN THE CHART ABOVE MUST NOT
BE USED.
FAILURE TO FOLLOW THESE PRACTICES MAY RESULT IN SYSTEM PERFORMANCE BELOW DESIGN
CRITERIA AND/OR MAY CAUSE STRUCTURAL DAMAGE TO THE BUILDING AND/OR ARRAY.
Ballast Block Description
Nominal Weight
kg [lb]
Allowable Weight Variance
Kg [lb]
BLOCK, CONCRETE, 2"X 8"X 16"
6.6 [14.6]
0.45 [1.00]
BLOCK, CONCRETE, 3"X 8"X 16"
10.7 [23.6]
0.57 [1.25]
BLOCK, CONCRETE, 4"X 8"X 16"
14.8 [32.6]
0.68 [1.50]
BLOCK, CONCRETE, 8"X 8"X 16"
32.7 [72.0]
0.91 [2.00]
