What are the effective options to insulate existing walls?
If this question has been answered please point the link – I am unable to find past material.
The home is over 50 years old. The wall cross section is: brick veneer, cavity, celotex type material, framing, and plaster on board inside. There is no other insulation material in the wall cavity between the celotex and the plaster.
The blown in insulation folks say they are the best option. The injection foam folks say they are the best in R value and performance – that the blown in settles over time and that it does not control air movement enough. Of course the foam is more expensive.
What is the right strategy?
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