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Old 03-20-2012, 10:19 AM   #1
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basement framing / insulation question in storage portion of finished basement.


llong time lurker first time poster, been learning a lot planning for my basement remodel.





The highlighted pink walls are indicating the walls I plan on adding extruded poly styrene to the concrete. Does anyone see a need to continue the styrene on the other storage room walls? I major complication with adding styrene on the back wall of the bathroom/ storage is that the main hvac trunk and return run the length of that wall from the furnace across the basement. I physically can not get styrene between the trunk and the concrete and I can not even see the rim joist let alone install xps and caulk. I was thinking about framing the back wall of the bathroom and rocking the back before I tip it up (moisture guard drywall) the back of this finished wall would then be about 4-5 off the concrete? Other ideas or suggestions?

The storage room that contains the furnace and the bathroom are on the foundation wall that divide the house from the garage (above)

History on the basement, no sign of water through the concrete or at the base of the walls. The house has a sump pit that ties to exterior drain tiles. Around the perimeter of the house. Temp is pretty steady year round from 59 61 degrees. The humidity stays consistent at 23-30% humidity year round. Located in north Denver Colorado.

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Old 03-21-2012, 11:14 AM   #2
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basement framing / insulation question in storage portion of finished basement.


Welcome to the forums!

Will you be required to finish the whole basement as you are over a certain percentage of finishing?

Will the utility room require it's own fresh air supply or adjoining room air supply, depending on furnace rating?

Is the HVAC ducting insulated?

Gary

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Old 03-21-2012, 12:04 PM   #3
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basement framing / insulation question in storage portion of finished basement.


i am unclear on the required finishing comment, i have not yet been informed if this is a code requirement.

i choose to leave these areas unfinished for storage only.

the furnace has a "high" fresh intake, i will be adding a "low" fresh intake as a part of this project.

the main trunk and hvac is installed already for the original home construction. hvac for the basement has not yet been reconfigured for the new basement layout.
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Old 03-21-2012, 10:20 PM   #4
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basement framing / insulation question in storage portion of finished basement.


Entirely up to you how much f.b. to use, the more- the drier: http://www.buildingscience.com/docum...study-analysis

Keep in mind ANY gaps behind the insulation (f.b. or otherwise) gives convective loops: http://joneakes.com/jons-fixit-database/743

Don't forget the rims with f.b./canned foam: http://www.buildingscience.com/docum...-at-rim-joist/

Sill sealer under p.t. bottom plate for thermal/air/capillary break, ADA the drywall, fire-stop the frame walls/concrete wall top and every 10' lineally.

Gary
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Old 03-22-2012, 03:17 PM   #5
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basement framing / insulation question in storage portion of finished basement.


that i understand. what about not installing any foam only in the storage area?
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Old 03-22-2012, 09:59 PM   #6
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basement framing / insulation question in storage portion of finished basement.


That first link I gave covers uninsulated walls and the possible moisture problems. It would be heated/cooled....needs insulation.
Either R-=10- continuous or R-13- in frame wall for your area Zone 5: http://publicecodes.citation.com/ico..._11_sec002.htm

Gary

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