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HERMIS > Blog > Uncategorized > Would it make sense to blow in extra cellulose insulation over 18 in over just the shower in the attic? – GreenBuildingAdvisor

Would it make sense to blow in extra cellulose insulation over 18 in over just the shower in the attic? – GreenBuildingAdvisor

  • September 22, 2026
  • Posted by: adm_1qhrbnb4
  • Category: Uncategorized
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Replies

  1. Expert Member

    MALCOLM TAYLOR | | #1

    sevak,

    I don’t see the link between the shower generating more heat and moisture than adjacent areas, and the need for more insulation above it. I also don’t think more insulation will provide any noticeable improvement in comfort.

  2. maine_tyler | | #2

    Over the course of a shower, the shower stall will lose more heat to the bathroom surroundings than through drywall with 15 inches of insulation above it, by a long shot.

    Moisture concerns (which are valid) are mitigated with air sealing (foremost) and vapor retarders, as well as bathroom fans with properly sealed and vented exhausts.

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