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Thread: insulating a bsement ceiling

  1. #1

    Default insulating a bsement ceiling

    Here's my situation:

    New house with an unfinished basement of which I have completed all of the framing and wiring. I plan on dropping the ceiling and installing recessed lighting.

    Questions:
    What are the pro's/con's of insulating the basement ceiling between the joists with regular fiberglass insulation?...rigid insulation?

    If using fiberglass, should I use faced or unfaced? Does it matter? Should the paper be facing the basement or the ceiling above?

    Any ideas/comments/concerns would be greatly appreciated!

    Thanx, all!

  2. #2

    Default

    If it is going to be finished, heated space then why insulate it at all?

    The walls and rim board will need to be insulated if it is finished space.

    If you are looking at using insulation as a sound barrier then just make sure you get IC rated cans and install them IAW the IC requirements.
    http://www.inspectpa.com/forum/forum.php
    My answers are based mostly on the ICC codes. Advice given is my personal opinion and every person performing work should acquire a permit from his/her jurisdiction and get the work inspected. My opinions are not directions to follow for DIYs or professionals

  3. #3

    Default insulating a bsement ceiling

    Walls and rim board are insulated.

    Yes, I am looking to use the insulation as a sound barrier.

    Yes, I am using IC rated cans....






    Quote Originally Posted by jar546 View Post
    If it is going to be finished, heated space then why insulate it at all?

    The walls and rim board will need to be insulated if it is finished space.

    If you are looking at using insulation as a sound barrier then just make sure you get IC rated cans and install them IAW the IC requirements.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    The best sound insulator is probably spray in foam, but boy making any changes later on would be a major pain! It is surprising how much sound can get through a little gap.

    If only for sound, I'd forgo the extra insulation and use a double layer of drywall with the first layer attached to sound isolation clips, and maybe the second layer attached using the sound absorbing mastic. Just two layers, attached conventioally would probably do a better job than adding insulation. Or, you can buy (expensive) special panels for sound isolation for the ceiling.

    Now, if the basement won't be finished soon, and won't be conditioned, insulation is a good idea at this time.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5

    Default

    Quote Originally Posted by jadnashua View Post
    The best sound insulator is probably spray in foam, but boy making any changes later on would be a major pain! It is surprising how much sound can get through a little gap.

    If only for sound, I'd forgo the extra insulation and use a double layer of drywall with the first layer attached to sound isolation clips, and maybe the second layer attached using the sound absorbing mastic. Just two layers, attached conventioally would probably do a better job than adding insulation. Or, you can buy (expensive) special panels for sound isolation for the ceiling.

    Now, if the basement won't be finished soon, and won't be conditioned, insulation is a good idea at this time.
    Spray foam is out due to the change issue. Also, I am dropping the ceiling, not installing drywall...

    Thanx

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    New England
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    21,374

    Default

    Well, put some fiberglass up if you want some sound isolation.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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