Is this insulation ok for my garage?

[TechBoyJK]

Finishing the walls in the attached garage and I want to put in something inexpensive for insulation.

This stuff is in budget and seems to fit the bill.

http://www.lowes.com/pd/Johns-Manvi...-with-Sound-Barrier-15-in-W-x-93-in-L/3011717

Thoughts? Any recommendations on a better buy?

 

[Red Squirrel]

I would not bother with faced, you're better off to use unfaced, then install a proper vapour barrier with tape and acoustic sealant. Less seams.

Roxul is also better than fibreglass, but fibreglass works too.

 

[Humpy]

I swear this is deja vu all over again.

 

[Greenman]

Why insulate a garage, it isn't conditioned space?

 

[Blain]

Do you have 2x4 or 2x6 wall studs?
Do you have studs on 16" center or 24"?
Are you planning on insulating the ceiling?
Are you planning on heating and cooling the garage?

 

[boomerang]

That specific product is for 2x6 walls.

 

[TechBoyJK]

Do you have 2x4 or 2x6 wall studs?
Do you have studs on 16" center or 24"?
Are you planning on insulating the ceiling?
Are you planning on heating and cooling the garage?

16"

Yes, eventually. I'm doing the walls now so I don't have to mess with it in the future.

Maybe.

This is more or less a 'while I'm at it' type of deal. It's not being turned into a livable space, but I plan on finishing it, with a drop ceiling, etc.

 

[TechBoyJK]

Why insulate a garage, it isn't conditioned space?

I'm doing it now because it will never be easier. I want to get these walls finished and not mess with it for 20 years. We'll eventually finish the ceiling, and I plan to have a workbench out there. So it doesn't need to be climate controlled per se, but I want some kind of insulation.

This is also why I don't want to use roxul or anything too fancy. Just want basic insulation so I know there's something in there.

 

[herm0016]

that will be fine. I am going to do the same thing to mine, probably in the spring. being a garage, i would just use this, than go through the motions with unfaced and a separate vapor barrier.

 

[TechBoyJK]

Thanks. Is there any reason, since this stuff is on sale for 50% off, that we couldn't just staple a bunch of it to the inside part of the roof? It's exposed. Could just get on a ladder and staple a ton of this stuff directly to the roof.

 

[herm0016]

Thanks. Is there any reason, since this stuff is on sale for 50% off, that we couldn't just staple a bunch of it to the inside part of the roof? It's exposed. Could just get on a ladder and staple a ton of this stuff directly to the roof.

"the roof" meaning the rafters holding up the sloped part? you need to leave space there for air flow, usually you insulate the ceiling and not the roof. if you can put in the foam troughs, you can insulate under those. you want the bottom surface of the roof sheathing to have airflow.

 

[TechBoyJK]

"the roof" meaning the rafters holding up the sloped part? you need to leave space there for air flow, usually you insulate the ceiling and not the roof. if you can put in the foam troughs, you can insulate under those. you want the bottom surface of the roof sheathing to have airflow.

Ok, that makes sense.

 

[stormkroe]

I would not bother with faced, you're better off to use unfaced, then install a proper vapour barrier with tape and acoustic sealant. Less seams.

Roxul is also better than fibreglass, but fibreglass works too.

Squirrel, repeat after me:
Most of the world doesn't use vapor barrier.
Not everyone lives in a frozen death hole (although I'm in it with you)

 

[Red Squirrel]

Squirrel, repeat after me:
Most of the world doesn't use vapor barrier.
Not everyone lives in a frozen death hole (although I'm in it with you)

What about keeping the A/C in? No vapour barrier = there may as well not be any insulation. Insulation stops thermal conductivity, but it does not stop air flow.

Also keeps bugs and stuff out. (if installed correctly).

You don't want to use double vapour barrier though. House wrap on the outer side (that still lets the house breathe) and vapour barrier on the warm/inner side.

 

[Greenman]

What about keeping the A/C in? No vapour barrier = there may as well not be any insulation. Insulation stops thermal conductivity, but it does not stop air flow.

Also keeps bugs and stuff out. (if installed correctly).

You don't want to use double vapour barrier though. House wrap on the outer side (that still lets the house breathe) and vapour barrier on the warm/inner side.

We air seal the framing to stop air movement. Here in the land of fruits and nuts, we also pressure test the completed structure for leakage. No air leakage, no movement, very little thermal gain or loss. And this is in an area that doesn't have weather, we have climate.