New Garage - Insulation

[wee-haggis]

Just got a new detached garage built. All my previous ones were attached. Now about insulation.I was thinking about using the typical fiberglass batts and vapour barrier on the walls. I have good storage space up in the raffters and I want to utilze it . Would it make sense to leave the underside of the roof uninsulated and just do the walls....or is it pointless to not do the walls and ceiling together?
Thanks

 

[Stuart in MN]

If you think about it heat rises, so the biggest heat loss in any structure is through the roof. Insulate the whole thing.

 

[rburke65]

Insulate the entire thing.

 

[Neura]

insulate the whole thing. and may sound stupid but it wont cost much more look into roxul insulation.. makes a hug difference on the noise coming out of the garage when completed. I used roxul and my neighbour used fibreglass. I can hear his impact drill if he uses it at night. in mine the compressor will be running chop saws, impacts etc at 2 and 3 in the morning and people walking by the garage can't hear it. I also went with the thickest vapor barrier I could get.

 

[MDSPHOTO]

If the ceiling is not vented is it ok to add insulation? My builder said I should hold off doing the ceiling until I put a vent up there.

 

[bazzateer]

Make sure the roof is vented before you insulate up there.

 

[MDSPHOTO]

Thanks for the confirmation guys, I did not see that being discussed as part of the guidance to the OP and I wanted to make sure I had that right. I hope to add a mini split system to my garage next spring and will do all the attic venting and insulation work at that time.