Ceiling insulation questions

[Itzkwik]

Getting ready to start on the insulation in the garage and have a few questions. I'm thinking of using tin or vinyl for the ceiling instead of sheetrock. Do I still use kraft faced insulation if I have a metal ceiling?
Also, I was pricing insulation this weekend. I've got 2 x 6 walls so I'll use R-19 for them. The price for the R-19 was .47/sq ft. The ceiling insulation, R-25 or R-30,was almost double the price, I think around .85 sq ft. Will using the thicker stuff make that much of a difference as far as comfort and energy efficiency is concerned? I was thinking of using the R-19 for everything to save a few $, but wasn't sure if the cost savings would be worth it in the long run.

 

[The Money Pit]

Getting ready to start on the insulation in the garage and have a few questions. I'm thinking of using tin or vinyl for the ceiling instead of sheetrock. Do I still use kraft faced insulation if I have a metal ceiling?
Also, I was pricing insulation this weekend. I've got 2 x 6 walls so I'll use R-19 for them. The price for the R-19 was .47/sq ft. The ceiling insulation, R-25 or R-30,was almost double the price, I think around .85 sq ft. Will using the thicker stuff make that much of a difference as far as comfort and energy efficiency is concerned? I was thinking of using the R-19 for everything to save a few $, but wasn't sure if the cost savings would be worth it in the long run.

Hey! A local! Are you done with the county inspections? If not, they will require you to have R-30. I used R-19 in the walls in the upstairs of my garage because I had trusses 24" o.c. and didn't want to wait to order the R-19. I would use the R-30. It's more expensive but I would say it's worth it. You are ok with R-19 everywhere else. Just my opinion.

Casey

 

[boiler7904]

The insulation needs a vapor barrier. That can either be faced (kraft, foil, or plastic) batts or a plastic vapor barrier over unfaced batts. I'd use the faced batts. They go up quicker than an insulation and seperate vapor barrier system. You can't really beat them from a ease of installation standpoint.

If you're going through inspections, only the building inspector can tell you if they'll let you get away with using R-19 instead of R-30. If you plan on heating or cooling the space, you'd regret the R-19 in the long run.

 

[PAToyota]

Consider that heat rises, so (to simplify things a lot) the heat is "pushing" upwards. That means you will lose more heat through the ceiling and roof than through the walls. Well, actually you will lose more heat through cracks and any place you can get actual airflow, but anyway...

Also remember that the vapor barrier goes towards the side that is typically warm more often.

I'm doing the same thing - tin ceiling. Found Lowe's discontinuing a product and snatched a bunch of it up at less than half price (see below).