| Re: [GMCnet] Ceiling insulation - is it worth it? [message #210341] |
Sat, 08 June 2013 13:15  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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I installed foam board the slightly easier way: only trim off the
high spots in the original foam so you can fit 1/2 or 3/4 inch foil-faced
board in the cavity, glued in place with expanding foam from a spray can.
Ie, don't try to remove all the original material, just make it more or
less flat. Still a huge mess (wear a dust mask when
cutting the foam with the multi-tool) and a lot of work to fit the
foam boards and hold them in place while the foam sets up.
If you can find somebody to spray and trim foam, that
would be a heck of a lot easier.
In the end I'm not very convinced that it makes much difference,
though we didn't do any quantitative testing. We're talking
about less than 2 inches of cavity with lots of "heat shorts" at each
aluminum rib after all. There's just not much room for R-value.
I suspect the paint color of your roof probably has more effect.
The bigger win by far is sealing up air leaks and covering the
windows with insulating shades.
Tip: before installing insulation, run any extra wires, etc,
that you are thinking about. It's a whole lot harder to do later.
Just my $.02.
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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