Home>Discussions>INSULATION & HVAC>How can I insulate over plaster walls without demo
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Xmtfx
How can I insulate over plaster walls without demo

I would like to either place rigid insulation over the entire exterior walls or frame a wall in front of the plaster wall and use batt insulation. This is our shore house and I do not want any issues with mold or moisture. Any suggestions being economical and safe?

HoustonRemodeler
Re: How can I insulate over plaster walls without demo

IS this space above ground? Below?

Interior ? Exterior?

Heated ? Cooled ?

Vented ?

Xmtfx
Re: How can I insulate over plaster walls without demo

This is for the interior side of the exterior walls. The spaces are heated and cooled.

MLB Construction
Re: How can I insulate over plaster walls without demo

there's a list a mile long in a previous post that addresses this issue and why you should not do what you're thinking about doing.

Xmtfx
Re: How can I insulate over plaster walls without demo

Thank you I will look for it.

Xmtfx
Re: How can I insulate over plaster walls without demo

I'm new to this site and see there are a lot of threads is there an easy was to search or do you know where the thread is.

MLB Construction
Re: How can I insulate over plaster walls without demo
KShenefiel
Re: How can I insulate over plaster walls without demo

If your existing wall is already has blown in insulation adding insulation to the inside whether foam board or fibrous between studs is rarely economical for the a previously stated reasons, But leaving the old plaster in place is unlikely to cause any mold or moisture problems. For much of the country having an air barrier and vapor retarder in the center of the wall assembly with insulation to both the interior and exterior is very good for preventing mold and moisture problems. Adding additional insulation to the inside could however cause problems in cool climates if there is already insulated sheathing on the exterior with a low perm facing.

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