Can I put rigid foam insulation over plaster exterior walls of a brick house?
I live in central Illinois and it gets very hot or cold during summer and winters here. My bungalow was built before 1900 so there’s literally no insulation in the house except for the attic. I was thinking of putting up some the pink R-10 rigid foam board insulation on my walls and then drywall over them. the walls currently have layer of lath, then plaster, then thin wooden paneling over the plaster. Is it ok to attach the foam boards over the wall without tearing anything down? I don’t mind extending the windows and doors or refitting the electrical outlets. Thanks.
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