Fiberglass batts in post frame.

[1low1]

Hello all, I have a quick question regarding fiberglass batts in my post frame building. The posts are about 6 ft apart and ceiling is 12 ft. with 7 inch depth. It wasn't constructed with bookshelf purlins/braces so I was wondering if anyone had ideas for keeping fiberglass batts from sagging while I install them and of course afterwards. Other types of insulation are just too costly at this point. Thanks

 

[matt_i]

What about blowing loose fiberglass fill in to wall cavities that are nearly finished. Then you don't have to worry about sag. I can't speak exactly for the relative cost but guess it has to be close to batts.

 

[Falcon67]

As detailed in another thread on fiberglass, the deal is that it need to fit tightly in the space and leave no gaps. Anything less kills the performance. I'd be thinking something the depth of the posts - maybe R19 for 2x6 wall, 24" if you can find it and chicken wire to keep it in place.

 

[4AudiQ]

How about running the batts horizontally?
I think I saw someone on this Forum do that.
Whichever way, there must be no gaps.

 

[jives]

Get wide batts. Go to MetalBuildingInsulation.com or similar.

 

[Highbeam]

I just framed out the bays with lumber 16" on center and installed the batts like normal. Lumber is very cheap.

 

[1low1]

@ highbeam unfortunately lumber isn't as cheap here as it is elsewhere. Wether I run it horizontally or vertically I think I will have problems keeping it within the cavities while I install a vapour barrier and wall sheets. I was thinking of twine or metal shipping strapping. Anyone see problems with that that I am not foreseeing?

 

[theoldwizard1]

Whatever type of insulation you choose and however you choose to install it, it needs to stay dry. If it gets wet/damp, it will freeze and become ineffective. You have no vapor barrier to the outside wall so I would recommend a light spray foam (1-2") on the inside to seal all cracks and act as a vapor barrier.

You could use "wet" cellulose before hanging your interior walls, or install the interior walls and blow in cellulose or fiberglass.

 

[yaidunno]

Buy wide batts ,you'll likely only be able to buy 8' wide and trim them to fit your post to post. I pinched the batt between the outter wall and a 2x4 above the ceiling line. See photo below.