Insulation, Radiant and Vapor Barriers - Pole Barn Insulation

I am building a 30x40x14 pole barn. It will be heated with a radiant slab, using 2" foam under the slab. I am shaking out the wall and ceiling insulation still though. Spray foam is to expensive. Batts could be done, by stapling them together to fill the 8' void, but my number once choice is blown fiberglass anyone worked with it, supposed to not settle like cellulose does. the wall section will be 8.5" making the wall r-19. Then put 14-16 in the ceiling would be r-38. I will use a plastic vapor barrier and 7/16 osb inside. I am open for input thanks everyone.

Scott

Blown in cellulose won't settle in walls as long as its pressure packed(dense packed) so its a much better choice than fiberglass. With a 8.5" wall, you can get about a R-30. And for your attic, you can get about a R-40 with 14" of cellulose. Seems like a much better deal going with cellulose than fiberglass. It also does a MUCH better job controlling air infiltration than fiberglass and it fills up all the nooks and crannies, unlike fiberglass.

Also, blown in fiberglass has a R-value of about 2.2 per inch. Cellulose is about 3.6. The R-value of fiberglass will actually be lower if its really cold outside. Cellulose will maintain its R-value to at least -40F.

Thanks for the info Adam, just to talk a bit more about it. My plan is to put up the vapor barrier over the interior girts, and tyvek over the exterior gerts. slit the vapor barrier as i move up the wall adding the blown in material, then tape the slits back off. You say it has a R value of 3.6 per inch. BUt everything I read dry blown cellulose is going to settle and when it gets even more packed down the R value starts to go down. I have not picked either, I see that your website says you do cellulose insulation, I am looking for the best product to do the job and only have to do it once, I don't want to have to go back in 5 years and top it off if and when it sinks.

Scott

When cellulose is blown into a wall, it should be packed in to about 3.5lbs/sq foot. When its at that density, it won't settle. Loose blowing the attic is a different store. When the attic is blown, its blown to a large depth than what you need. Meaning that lets say you want a 14" final depth, you would blow more than that to make up for the predicted settling. The bags are sold at the settled depth, not the loose depth.