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Old 04-21-2013, 06:21 PM   #1
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Should I insulate basement storage?


So, I am finishing my basement and I understood the value of proper insulation.

I have removed most of f.g. insulation blanket that the builder installed and replaced them with XPS insulation. I say most of them because I have not removed the area behind the furnace, and around water heater, sub-pump, etc. where I was thinking to use them as a storage.

Should I remove them as well and replace with XPS?
I'm thinking to safe some fund and put it toward something else.

Let me know if you think this is a mistake.

Thanks!

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Old 04-21-2013, 06:32 PM   #2
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Should I insulate basement storage?


How are you enclosing the XPS insulation ?

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Old 04-21-2013, 06:36 PM   #3
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Should I insulate basement storage?


We have no idea about where you are and what your climate is.

Are you trying to create a controlled space or keep it warmer or colder?

Because of the moderating effects of the soil, there is a tendency to over insulate a basement, especially if the theoretical, short term R-values used in areas that are really controlled by thermal mass and storage and not short-term daily or seasonal exterior air temperature swings.

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Old 04-21-2013, 06:42 PM   #4
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Should I insulate basement storage?


XPS insulation (R-10, 2" thickness) is installed on the concrete wall perimeter of the basement for the finish areas.

I am in Virginia, near Washington, DC area.
The storage area is part of the basement where the garage is.
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Old 04-23-2013, 10:16 AM   #5
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Should I insulate basement storage?


I think what Oso is referring to is what are you putting in front of the XPS? I don't believe that it is supposed to be final. Are you putting a 2x4 wall up against it?

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Old 04-23-2013, 10:25 AM   #6
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Should I insulate basement storage?


XPS has to be covered by something like drywall that will keep flames away from it for a certain amount of time. When it burns it lets off fumes that will kill people in minutes. I believe it's illegal(and not smart) in all parts of the country.
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Old 04-23-2013, 10:42 AM   #7
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Should I insulate basement storage?


Yes, the area covered by XPS will be finish areas and therefore I will frame them up and cover them with drywall. However, the area that are meant for storage (i.e. behind the furnace, and around water heater, sub-pump, etc), I left the builders f.g. insulation blanket alone.

My question is: should these f.g. blanket insulation too and replace them with XPS? XPS is not cheap. So, If I can safe money by not replacing them, I could invest the fund on other things in the basement.
I could also just remove them and leave them as bare concrete wall as f.g. insulation may harbor mold, but I am not sure what the code requirement is for concrete wall. Or, perhaps, I just remove them when the inspection is completed.

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Old 04-24-2013, 08:34 AM   #8
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Should I insulate basement storage?


I wouldn't put XPS near a furnace or water heater. Would you even have room to cover it with drywall? I assume these are in their own room or closet, correct? You could always insulate the walls between the room and the basement if it concerns you.
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Old 04-28-2013, 04:49 PM   #9
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Should I insulate basement storage?


I've been wondering the same thing. There is a lot of information saying why to use XPS and not the basement diaper, but WHAT IF the space is divided just as the OP mentioned?? I was "planning" on splitting my basement in half, half finished with drywall and half left as is with the diaper walls which will be storage. I want to look at the walls before I enclose them of course, but if half the basement were to remain diapered....is it worth the expense of XPS-ing the finished half?? I can see a reason FOR: I suppose IF there were to be a crack which leaked behind the drywall, I'd rather have XPS in contact there than fiberglass. The unfinished portion I will see water coming down the bottom of the wall if there is a leak. The whole part about condensation, etc. seems to be short-circuited though by having a half and half basement. Thoughts??

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