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Ask the Experts!

22 October 2008

“What is the best was to insulated exterior stud wall cavities in a 1912 plaster and lath interior and lap side exterior walled house without removing either wall surface?”

The best way to insulate an exterior wall is using dense packed cellulose (recycled newspapers).  The contractor will remove some siding and drill abut a 2″ hole in each stud cavity and blow in the insulation.  Then they will plug the hole and replace the siding.  You may have to do some touch up painting on the siding when they are done.  If the existing walls do not have any insulation, you can expect the energy savings to pay for the investment in 5 to 10 years, depending on the efficiency of your heating system and what temperature you keep the house at.

Answer provided by Paul Morin, Senior Building Analyst at the Center for Energy and Environment.

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