Attic insulation

[Scott K]

I want to blow insulation in the attic of my garage, then also add some to the rest of the house while I am at it. Currently there is none in the garage attic, and there is cellulose insulation in the house attic. Should I put cellulose is above the garage, and just a few more inches to the attic of the house, or should I use fiberglass? Will it matter if I use fiberglass ontop of the cellulose? Is there a better one to use in the garage attic?

How many inches should I put in the garage? How many inches should be in the attic of the house?

I will be renting a blower and doing it myself.

[swamptiger]

I would just go with the cellulose as long as you already have it in the house. I have 12" fiberglass roll insulation covered with about 4" of fiberglass blow-in insulation in the house and about 13" of fiberglass blow-in in my shop. I started with 15-16" of blow-in in my shop when it was built in 1993, and I added some over the top once already, and it is due for some more again now, so it settles quite a bit over time. I think the cellulose has a higher R factor than fiberlass. You can blow fiberglass over cellulose, but not the other way around, because cellulose is heavier than fiberglass.

[Bigbartguy]

fyi make sure and put vapor barrier in garage attic before you blow insulation in. I wish I had done this

[Scott K]

fyi make sure and put vapor barrier in garage attic before you blow insulation in. I wish I had done this

The sheet rock is already on, and I dont believe there was a vapor barrier on it. Is there a way to lay it in between the joices and have it be efficient? Or is it to late that the sheet rock is on there? What will it harm if I dont install the vapor barrier?

[minneman]

a couple coats of Latex paint on the ceiling is all you need to do.

[Surface Tension]

To late to lay in a VB as all you will do it trap moister and end up with the bottom cord staying wet.

I'd blow it.