Insulating new 35x35 detached

[JUSTA50]

Been searching on here what most people do for new construction garages and have a few questions.

I'm thinking about not doing sheetrock on the ceiling and going with some type of metal roofing material. Currently have standard roof truss system... What type of insulation would be recommended. Spray in is not worth the long term payout.

Option 1: Roll in insulation and nothing else.
Option 2: Blow in
Option 3: Both

The thing I worry about is the weight associated with blow in. Don't want the metal to sag. Also, what R value?

 

[rburke65]

What R value do you want? If you have lots of money you would like to donate to the utility company, don't put in any insulation. Don't want your metal to sag, trusses closer than 8 or 10 foot apart will help a lot. And you probably won't need a lot of insulation in Aruba.

 

[KMR Construction]

Check with local building code. Here in RI it is R21 in the walls and R38 in the ceilling. This doesn't apply to a garage but I like mine nice and warm. Blown in would be a better choice for the ceilling, hang the sheetrock and then get up there and let it rip. Walls I would try to get R15 fiberglass or better

 

[camnick]

You may be surprised. I found a guy to spray foam my barn walls. My barn is 60x81x16. It is open cell foam sprayed 3" thick. It cost $3500. He calls it a do it youself job. I had to cover everything inside the barn and clean up everything afterwards. Well worth the money.

 

[geologist]

Blown-in insulation is a royal P-I-T-A. I stick with sprayed or roll-in, with my preference being for rolled insulation whenever possible.

 

[TXNinAZ]

Blew-in R34 above my attached garage (~700 sq ft in the attic) on 12/30, and it was a pain, but not as painful as trying to roll in around all the conduit, phone cables, support braces, etc. I'm very happy with the results so far, and although that one day was pretty miserable, it was the best choice. In order to get through the mess in one day, we blew in 27 bags at my dad's house, 15 at my brother's and then 45 into my attic. One blower, two bag feeders.

Don't be worried about the weight of the cellulose unless your building is made with .25"x 3" balsa wood beams- it's not all that heavy.

 

[itsspeeds]

I'm using R 30 bats for the ceiling. I think its almost double the cost vs blown in, but I am gonna make some storage area up there for lightweight stuff and I will probably be spending alot of time up there addin and changin outlets, running tv cable and what not, so I didnt want to mess around with the blown in everytime. Just a personal preference.

 

[jimp]

I like R 30 batt. And you might want to look at the attached ashrae chart for R value you want.

Much over R 30 is waste (even though I always use more).

 

[bigdav160]

I'm with Mr Burke.

Not enough information to make any kind of recommendation.