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Basement Perimeter Framing

Posted by wjansen (My Page) on
Thu, Aug 5, 10 at 18:09

Hi Guys,

I'm at the point in my basement remodel where I'm starting the framing (after nighmarish floor levelling!). My question is what is appropriate for a walk-out basement - let me explain further.

3 out of the 4 sides of my basement are half concrete foundation walls on the bottom half and wood stud framing on top (common for walk-out), but the walk-out wall that has the sliding glass door is completely wood stud framed from ceiling to floor (load-bearing wall with no above-ground foundation) with brick exterior on other side of studs and insulation.

For the half concrete foundating/half framed wall, I plan to simply build stud walls in front of the current foundation wall with a 1/2" gap (as seems to be common). However, for the fully framed current wall, what should i do?

It seems like a serious waste of space to build a new stud wall in front of this wall (losing 4.5" from the wall), but I also feel like I can't just drywall this as-is either (or could I?). I was thinking of maybe adding 1" or 2" of furring strips to the existing studs, put in a higher R-value insulation (thicker, like would go between 2x6s) and drywall over the furring strips (after electrical, etc.).

What do people do in a situaiton like this?! Is there any reason to add another studwall?

Thanks for any advice...

Follow-Up Postings:

RE: Basement Perimeter Framing

If comfort and energy savings matter, you need to provide sufficient space for insulation to meet the min. R Value for your area. According to Dr. Lstiburek of Building Science Corp., the minimum R values north of the Mason-Dixon line is R20 for basement walls, R40 for abovegrade walls.

For below grade walls, do not use fibrous insulation unless you can locate MemBrain brand vapour barrier, which I have found is very unlikely, or you first attach extruded polystyrene boards at least 1" thick to the walls. This can be followed by high-density fiberglass batts.

Copying what previous builders/renovators have done makes sense only if what they did was sound practice by contemporary standards. Leaving a 1/2" of space between the foundation wall and framing (and insulation) only provides space for air currents to swirl reducing R-Value.

Here is a link that might be useful: Building Science Corp. on Basements

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