02:54PM | 02/19/14
We have discovered that our 8 year old home does not have rim joist insulation. I'm reading and hearing that spray foam is the answer not fiberglass insulation due to mold issues. Our basement is finished with drywall in most areas. Would it be better to cut into the basement drywall ceiling under each cavity and spray foam into each cavity or go above the area (living room and bedroom on main floor), take back the carpet and remove floor board to expose the rim joist then spray. Is it worth the effort? Laurie

Duane, Moderator

10:36PM | 02/20/14
Member Since: 11/14/13
91 lifetime posts
Thanks for your question,
Most insulation contractors are very good at getting spray foam in tight and otherwise non serviceable areas. I would recommend to make small holes in the areas where you have drywall and apply foam.
Open cell foam would best work in this area, it will not expand into the drywall causing it to bow or crack.
In the areas that does not have drywall will not be a issue.

Duane, expert moderator


05:15PM | 01/16/15
Laurie, I'm curious. Did you have spray foam put in and did you find it helped? Did you find the cost reasonable for the benefit? We believe we have fiberglass insulation but it is not effective and think we need the sprayfoam.

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