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Old 03-26-2007, 03:22 PM   #1
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Basement blocking


I intend to start finishing my basement in the next couple weeks, and I'm trying to nail down all the framing details before then. The latest question I'm trying to answer is whether I need to install blocking above my exterior wall insulation. I'm planning to use the following wall construction...
  1. Adhere 3/4" Extruded Polystyrene (XPS) directly to the cured concrete wall
  2. Frame a 2x4 stud wall right up against the XPS 16" OC
  3. Put moisture retarding kraft-faced fiberglass insulation between the studs
  4. Surface the wall with 1/2" drywall
  5. The ceiling will be 1/2" dry too
My understanding is that if my framed wall was, say, 2" from the concrete wall I would need blocking above the 2" gap. My hope is that with the wall right up against the XPS, I won't need to do this. Any advice would be most appreciated! Thanks!

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Old 03-26-2007, 05:43 PM   #2
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Basement blocking


Quote:
Originally Posted by ksypal View Post
I intend to start finishing my basement in the next couple weeks, and I'm trying to nail down all the framing details before then. The latest question I'm trying to answer is whether I need to install blocking above my exterior wall insulation. I'm planning to use the following wall construction...
  1. Adhere 3/4" Extruded Polystyrene (XPS) directly to the cured concrete wall
  2. Frame a 2x4 stud wall right up against the XPS 16" OC
  3. Put moisture retarding kraft-faced fiberglass insulation between the studs
  4. Surface the wall with 1/2" drywall
  5. The ceiling will be 1/2" dry too
My understanding is that if my framed wall was, say, 2" from the concrete wall I would need blocking above the 2" gap. My hope is that with the wall right up against the XPS, I won't need to do this. Any advice would be most appreciated! Thanks!
Do you mean wood blocking?

I am going to assume that you must mean insulation.
I will also assume that you are referring to the bay above the freezewall wall, the rim joist bay.

If this is what you are asking about, then I would say absolutely yes, you should insulate that area.

If I have this all wrong, my apologies...and ...please clarify....

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Old 03-26-2007, 08:53 PM   #3
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Basement blocking


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Originally Posted by AtlanticWBConst. View Post
Do you mean wood blocking?

I am going to assume that you must mean insulation.
I will also assume that you are referring to the bay above the freezewall wall, the rim joist bay.

If this is what you are asking about, then I would say absolutely yes, you should insulate that area.

If I have this all wrong, my apologies...and ...please clarify....
I mean wood or drywall blocking. I'm afraid my description above may be somewhat lacking. Since a picture is worth 1,000 words, I'll post a link to a write-up my county did on finishing basements that provides an illustration.

http://www.fairfaxcounty.gov/dpwes/p...ts/details.pdf

Check out figure 6 on page 6 of the linked PDF. It shows the example I tried to describe of the framed wall offset from the concrete wall with insulation in between. On top of the insulation they show a fire blocking--2x or drywall or whatever.

So, going back to my original question, do you have a take on whether I'd need to put fire blocking on top of my 3/4" XPS if the framed wall is right up against the XPS?

Hopefully that's clearer now. Thanks!
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