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Basement insulation

bongo30 | Posted in General Questions on

Hello, after reading through many articles here on GreenBuildingAdvisor, we are considering installing rigid foam on the interior wall of our basement (this is new construction). However, I just noticed that our plumber run his lines tight on the concrete walls so we can’t slip the rigid foam boards under. Is there a way to detail this somehow with rigid foam? 

Do we even need rigid foam on the interior walls? When we waterproofed during the construction, we installed R-10 insulation on the exterior of the basement walls. We are in NY, zone 4.

thank you,
Lana

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