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Question DetailsAsked on 1/31/2015

I want to have blown in insulation above my garage

The bedrooms above my garage are freezing in the winter. They need insulation and I've been told blown in is the best. I cannot find a contractor in my area.

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2 Answers


As an old weatherizer, one of the biggest areas for improvement of quality of life for those who lived in a home with a tuck under garage was insulating the garage ceiling. It made the rooms above it warmer as well as the next door family (?) room as much as 5 to 10 degrees warmer. The old tuck under garage featured a fiberglass bass of 2" to 4" and when a contractor with a high velocity blower drilled holes in the ceiling in between each floor joist at 7 to 10 feet spacing and blew cellulose insulation the old batt would virtually disinterate and we could pack the cavity with insulation. Cellulose was our choice over fiberglass because not only did it have a higher R value but it kept moving air, ie convective heat loss to a minimum. Today there are foam insulators but I wonder how much power their systems generate to eleminate the old batts between the joists. The holes were plugged with white plastic plugs in the ceiling. I have no idea where you live but I suggest you start at the big box stores, Lowes, Menards, etc and talk to the dept managers in building products areas, Or join Angie's List and access another good resource for reputable insulation contractors.

Jim Casper Old Energy Conservation Contractor

ps for ideas on gutters and covers see my blogs


Answered 5 years ago by jccasper


I am presuming the garage is unheated or low-heat.

Good comments by Jim Casper as usual. Personally I like fiberglass better than cellulose because it does not support mold so well if it gets wet, and does not mat down so much - but cellulose does blow into ceilings easier and is cheaper. In your application, the better draft-stopping characteristics of cellulose (from the matting) should make no difference, because in a drywalled ceiling/floor you should not have any significant convection or through-going airflow going on anyway.

A couple of thoughts:

1) be sure garage is not going to get too cold, if there are any pipes there - could be the heat from above is keeping your pipes thawed

2) I would put a thermometer, protected from room temperature by a bunched rag, on the floor and against the ceiling and walls for a minute or so, or use a laser thermometer - I would bet the floor is far from the coldest surface, so your insulation $ might best be spent in the attic or walls instead.

3) if using cellulose, be sure the garage ceiling drywall was nailed to spec - sometimes they get lazy and only nail every foot or so - I have seen several cases where inadequate nailing interval led to drywall coming down after a blown-in cellulose or foam-in-place insulation job.

4) plastic plugs to fill the holes after putting in blown-in or foam-in-place insulation in a garage is a no-no. Fire code violation, because the garage ceiling under living space has to be a fire-rated surface, and most types of plugs are out - holes have to be repaired with drywall patching compound. There are fire-rated push-in plugs, commonly called abandonment plugs, that have expansive fire stop material integral with them that are used in commercial work, but last time I bought any they were about $10 EACH for the size that would fill a blown-in insulation hole.

Your Search the List category is Insulation, or google your town name combined with the phrase - blown in insulation - and check the company names that come up on AL for ratings/reviews. If you still can't find any (and are a member), contact member care -they will try to scrounge up three for you.

Answered 5 years ago by LCD

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