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I live in MA and am finishing half my basement. I plan on heating it with electric baseboard. I have 1 inch foam board secured to cement walls. The framing sits about 7 inches from wall due to sewer pipe. Do i need to insulate the 2x4 walls ? If so what type of batting ? What type on the interior walls ?
 

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The batts should really be directly touching the foamboard to eliminate any conductive loops; http://joneakes.com/jons-fixit-database/743

As per code, the frame wall/cavity behind should be fire-stopped every 10' horizontally; http://publicecodes.citation.com/icod/irc/2006f2/icod_irc_2006f2_6_sec002_par018.htm

ADA the drywall, to stop room air from getting to the concrete wall; http://www.buildingscience.com/documents/information-sheets/air-barriers-airtight-drywall-approach/

Remember the rim joists; http://www.buildingscience.com/documents/information-sheets/critical-seal-spray-foam-at-rim-joist/files/bscinfo_408_critical_seal_rev.pdf

For your location; if near Boston- 1" f.b. leaves the inside f.b. at 39* on your coldest days in winter with only 32% RH in the room. 1-1/2" f.b. = 57%RH at 70*, much safer against condensation there. If near Worcester- 1" f.b. = 24%RH, 1-1/2" f.b. = 49%RH.

Gary
PS. welcome to the forums!
 
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