An expansion loop is incorporated into roof drain piping to accommodate thermal movement and prevent stress on the plumbing system. The isometric configuration includes ninety-degree elbows and parallel pipe segments with specific dimensional requirements of nine feet three and nineteen-thirty-seconds inches by four feet eight and thirteen-thirty-seconds inches. Where multiple pipes run parallel, the innermost expansion loop must meet these specified sizing requirements.
4' - 8 13/32" 9' - 3 19/32" WHERE MULTIPLE PIPES RUN PARALLEL, THE SIZE OF THE INNER MOST EXP. LOOP MUST MEET THESE REQUIREMENTS
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