Insulation questions

[brooksman9]

How can I best insulate my ceiling and leave exposed in my new garage I am building?

 

[WisJim]

What do you want to leave exposed?

 

[mike93lx]

Staple up kraft faced batts to the rafter ties

 

[dave*99]

Staple up kraft faced batts to the rafter ties

If the insulation is exposed - be sure to use the fire rated product. Standard Kraft facing is flammable and required to be covered - typically by drywall.

 

[u2slow]

In my climate, poly VB on the bottoms of the joists to keep your heated air inside. R30-40 between the joists.

The cheapskates like to use grow-op poly here because one side is white and brightens up the space.

 

[dave*99]

In my climate, poly VB on the bottoms of the joists to keep your heated air inside. R30-40 between the joists.

The cheapskates like to use grow-op poly here because one side is white and brightens up the space.

The OP is in Mississippi. I suspect poly VB in his climate may be undesirable.
One has to check the local requirements and practices.

 

[billconner]

Are you air conditioning the space?

 

[brooksman9]

Yes wanting to leave the ceiling exposed. Will be working on restoring a truck so would be welding etc.

 

[brooksman9]

Are you air conditioning the space?

No. No heat either except maybe a space heater. Doesn't get all that cold for that long here. It does get hot though...

 

[mike93lx]

Yes wanting to leave the ceiling exposed. Will be working on restoring a truck so would be welding etc.

The ceiling as in the bottoms of the rafter ties or are you looking to keep the space between the rafters and ties open?

If you put up liner panel, you could blow in above. That would give you a nice, bright ceiling and great insulation

 

[brooksman9]

Yes, looking to leave the entire space open. Can you use spray foam in the rafters or is it bad for the roofing/decking? Also would that even be economical. I am doing the majority of this work myself with a little help. Contractor price to build was outrageous.

 

[mike93lx]

Spray foam really isn't a diy thing.

You either need to leave room for venting or seal it all up. Without hvac, it's going to get hot In there without venting.

If you want to control the Temps, add a ceiling covering and insulate above, IMO

 

[billconner]

I think without ac, you'd be fine with unfaces batts between the rafters. May need some wire or insulation props.

Should keep the heat down some and I don't think there's any surface that will condense.

 

[brooksman9]

Thanks

 

[acer66]

I think without ac, you'd be fine with unfaces batts between the rafters. May need some wire or insulation props.

Should keep the heat down some and I don't think there's any surface that will condense.

I would not do unfaced fiberglass without covering it because I would see myself in a constant light dusting of fiberglass.

I also would choose mineral wool over fiberglass anyway which also is less problematic if you have sparks from grinding etc finding their way up there if you decide to leave it exposed.

 

[Mzungu]

+1 on mineral wooll and the supports to hold it up.

 

[PoorUB]

I know it isn't the way you want to do it, but sheet the collar ties and lay in insulation. Anything else will be a lot more work.