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Posted by nwas (more from nwas) on Sat, 14 Jan 2012 17:00:14
In Reply to: Re: OT: remedial insulation of 125 year old house, RichF, Sat, 14 Jan 2012 14:46:38
The air gap you have is actually the ideal insulation. Air is the world's best insulator next to a vacuum. The issue is leaks into the void. If the building is brick, I'd concentrate on just stopping any air transfer where the brick meets something else.

$160/month? You can do better calcs than I can here by examining total bills for the year, degree days, etc, but even a serious cut isn't going to generate much return per year.

OTOH, you might be able to increase comfort upstairs - but only if the issue is external heat or draft. If it's system design as you mention, then insulation won't make a huge difference. Note that high Summer temps upstairs might be better dealt with by installig attic ventilation and/or cooling.

Lastly, heat rises. How's your attic insulation?

I can't see how tearing down all your interior walls, doing new drywall, and insulating will pay back very quickly, but you do the R value & calcs. It might even be worth hiring a heat loss engineer to do a little building analysis (hire a guy who does analysis, not installations, or the results will be pre-determined).




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