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Insulation Discussion Forum • View topic - sidewalls and ceilings?

sidewalls and ceilings?

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sidewalls and ceilings?

Postby jas1n » Wed Oct 17, 2012 8:01 pm

If a sidewall already has batts in the walls can more be added?
Also what about flat roof 3 floor house. None of the cielings are insulated. Ceilings are 9 ft high would insulated from the inside be best in this situation?
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Re: sidewalls and ceilings?

Postby SIM » Thu Jan 17, 2013 3:49 pm

If the sidewall batts take up the full depth of the stud than it is difficult to blow additional fiberglass or cellulose insulation into the cavity. But many houses built in the 1940s, 50s and 60s had what we call a cheater batt, that is only about 1" thick. In this case we regularly dense pack these walls with cellulose.

You can insulate between floors with cellulose but you will need to be sure you do not insulate around recessed lights or other heat sources (Bathroom heat lights). You will also want to make sure there is no knob and tube wiring.

Keep in mind that cellulose is a much better sound proofing material than fiberglass, but both work best with sounds that are moderate in tone like speech. Low base and footsteps will still transmit by direct vibration through the ceiling joist framing.
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