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Basement Insulation


mrfunnyguy's Avatar
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12-29-14, 06:38 AM   #1  
Basement Insulation

The builder of my new construction home wrapped the basement interior walls with insulation (fiberglass with white backing). I'm currently framing to finishing the basement into a living space.

My question is:

Can I add additional insulation in the wall cavity over-top of the currently wrapped walls?Name:  IMG_3632.jpg
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Thank you in advance for your help!

 
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stickshift's Avatar
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12-29-14, 06:46 AM   #2  
Welcome to the forums.

Looks like the stud bays are full so I don't know how you propose to add more insulation. If you do, however, that plastic needs to be removed first.

 
mrfunnyguy's Avatar
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12-29-14, 06:51 AM   #3  
The walls you see in the image is pre-framing (I should have relayed that in my posting).

 
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12-29-14, 07:05 AM   #4  
Then just remove all of the moisture barrier and you can insulate your stud walls when you build them.

 
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12-29-14, 07:25 AM   #5  
Are you sure you really need to add more insulation to an already insulated basement in such a mild climate? Keep in mind that your floor is about the same temperature or colder than the surface of the existing wall surfaces (and has more area).

Over-insulating of basements is very common and you lose the thermal inertia of the soil and walls in the summer when you want to keep the home cooler if you use central AC.

It is just a matter of where you want to split hairs and spend money on short term indicated insulation values (the "R value") for one of the 4 seasons.

Dick

 
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12-29-14, 09:47 AM   #6  
Being new construction and since they determined years ago that foundation walls need to dry to the inside (as they cant dry to the outside below grade) here is an 06 Building Science article explaining why it shouldn't have been done that way.

There is also the issue that a new home has no history to know what moisture problems may occur. The tar on the outside has also been proven to not be sufficient as a moisture barrier.

Photo 3 shows what you have and photo 4 shows what you want.
BSD-103: Understanding Basements — Building Science Information

Bud

 
PaulSC's Avatar
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01-10-15, 07:22 AM   #7  
Bud9051 - this is very helpful for me as well....thanks for the link.

 
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