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Methane Mitigation, PVC pipe vs HDPE Pipe under slab?

Methane Mitigation, PVC pipe vs HDPE Pipe under slab?

Methane Mitigation, PVC pipe vs HDPE Pipe under slab?

(OP)
Value Engineering was requested by CM/Owner. Commercial Project includes methane mitigation using air intake/exaust/blower system, slab on grade, 3/4" washed stone bedding, new construction.

One item sticks out - 8500LF 4" Perforated SDR 17 HDPE pipe. Using Perforated PVC under slab would lower project costs, seems logical. Engineer prefers HDPE?. But only on perforated? Make sense?

Cost savings would be substantial enough to include in proposed VE. Any thoughts on industry/design standards.   

Thanks All, Steven

P.S. We all have read all the PolyEth pipe sales pitch so please stick eng/industry standards.thanks

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