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PC § 417.5.2.3
Sheet lead shall weigh not less than 4 pounds per square foot (19.5 kg/m2) and shall be coated with an asphalt paint or other approved coating. The lead sheet shall be insulated from conducting substances other than the connecting drain by 15-pound (6.80 kg) asphalt felt or an equivalent. Sheet lead shall be joined by burning or soldering.
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