In our area, wet standpipe/sprinkler pipe running through unheated parking garages always gets heat tracing and insulation.
On this current project, the general contractor wants us to run a 4-inch main as high as possible to a 7.5-inch thick post-tensioned concrete deck that has a heated space above it and a 24 deg F 1% design temperature below in the garage. They're looping 14-inches of batt fiberglass with a plastic barrier below it creating an envelope around the pipe.
The general contractor is questioning whether the heat tracing is needed. We've got plenty of experience 'tenting' sprinkler pipe in attics but never under concrete. I've suggested they hire a mechanical engineer to do the calculations.
Does anyone have experience with this situation?
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