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Adding layer of foil backed rigid under cellulose in a radiant heated ceiling…

dfmcintyre | Posted in Energy, Heating & Insulation on June 3, 2012 10:12am

Situation:

Our home was built in the early 1960’s to an electric companys “standard”. Even have the “Gold Medallion” seal by the front door to prove it. Heh.

The ceilings, as best I can determine, were constructed by using two 1/2″ sheets of rockwall with a sandwich of a continuous run of heating element (possibly stapled) and then wet plaster used to “glue” the two sheets together and a 1/8″ finish coat to finish the job.

We do like the ability to regulate each room, and turn off rooms completely when not needed (kids are grown, and we don’t use the living room nor basement rooms continually). And we do not miss the dust and on off cycles of gas fired force air. Retrofitting and it’s associated costs are a bit out of the question.

But I can tell when the January and February electric bills arrive….the snow’s melted off the mailbox…..

 

So I’ve been wondering if the following might reduce my electric bill:

Attic has approximately 12″ of blown in cellulose. Would it make sense to temporarly remove the cellulose (just move it one or two joists over), cut some 1″ thick, rigid foil backed insulation board to fit between the joists, caulk around the edges and place the cellulose back over it.

This would seal some known small air leaks and I’m thinking it would direct the radiant heating down, rather then allowing it to go up.

 

Thoughts?

 

Thanks – Don

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Replies

  1. DanH | Jun 03, 2012 11:17pm | #1

    Or you could just put more cells in the attic.  12" isn't very much.  (And I suspect you underestimate the effort involved in raking it aside to install your foam.)

  2. IdahoDon | Jun 03, 2012 11:33pm | #2

    Personally I'd just blow a lot more cel into the attic and don't worry about the foam board.  I don't think the cost in terms of time and money is worth it to add the foam board over just blowing in cel to an r60.

  3. User avater
    xxPaulCPxx | Jun 05, 2012 11:05am | #3

    I agree with adding more cells, but I would also look at doing a good job sealing the penetrations first.

    One question for you:  Where are you located?  I ask this as Solar Power works better in winter (the panels are cooler and more efficient), you might consider adding a few panels to help offset the load your electric heating system uses - especially if you orient them to take in the max WINTER sun rather that all year power.

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