Which insulation is better to insulate inside of stucco walls ?

Question

Which insulation is better to insulate inside of stucco walls ?

Asked by Greg

I live in a Tudor style house which was built in 1940. I'd like to insulate the walls.

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Answers

Lucas Johnson's picture

Most importantly, you will need to find a nearby expert to help you with this project.

The good insulation options are all installed with expensive and difficult to operate truck-mounted systems. I recommend starting at www.BPI.orgor searching for an energy auditor here in GreenHomeGuide's directory.

I think dense pack cellulose (or fiberglass) can be a good option for "drill-and-fill" depending on average moisture levels and indoor air quality goals.

  • Also, there are many new expanding foam options that could work well.
  • If using expanding foam, you need to make sure the expansion pressure will not crack the Stucco.
  • Lastly, remember that you will need to budget for the patching of two holes per stud bay (so probably at least 200 holes per home) and painting wall-to-wall for a nice finish.

Ideally, you are also able to install some rigid foam board underneath the Stucco to create a "thermal break" (the wood framing has very poor insulation value and is about 20% of your wall surface in an older home).

The foam board should be paired with a weep screed and other best practice water managment systems.

For more information:

Read "I want to add wall insulation to my 1920 home. I have two locally available options -- Icynene and Tri-polymer foam. Can you advise me?" a Q&A answered by Alex Georgiou.