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.
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