[Greenbuilding] Inserting insulating foam between brick layers?

[Stephen Young]

 Thanks - I wondered if that would be an issue, and would likely use the
"light expanding" version designed not to bow window frames or, I hope,
push mortar.

  ----- Original Message -----
  From: "Beatrice Dohrn"
  Subject: Re: [Greenbuilding] Inserting insulating foam between brick
  layers?

  BE careful of its expansion pushing your mortar out.  It expands
  powerful.

    From: Stephen Young <tebewebb at email.com>

    Dear all,  Does anyone have expertise/intelligent thought on the idea of spraying expanding insulating foam between the two layers of brick in my 1860s brick row house?  I'm about to do a major repointing job on the mortar, and realize that if I want to do it, now would be the time, as
     it will be easy now and harder afterwards.  I'm considering poking holes through the mortar every few square feet, and spraying in as much of the insulation as will go. There is a gap of 1 - 1.5 inches between the outer brick and the inner brick.  Is this a bad idea? Does there need to be air flow btwn the layers?  Note that, inside the brick, I already have 1.5 inches of polyisocyanurate btwn framed metal studs below the drywall, so this may be overkill, but I just think it's a cool idea!  Thanks for whatever advice folks can give!  Stephen _______________________________________________ Greenbuilding email list      Environmentally-preferable design, construction, building elements List info: http://listserv.repp.org/mailman/listinfo/greenbuilding_listserv.repp.org List email: Greenbuilding at listserv.repp.org Managed by BuildingGreen, Inc. http://www.buildinggreen.com       publisher of Environmental Building News and GreenSpec Hosted and archived by
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