Hi There,

I am using open web trusses for my shed roofed new construction home. Probably a little overkill but oh well.

My plan was to go with blown-in cellulose but recently I have been tempted by self installed batts because of the money I could save.

My lower story will have a 24 inch deep truss and my small upper story will be 18 inch. Both roofs will be vented.

With cellulose i would have to ensure there was a robust air gap baffle that would not get “pinched off” in the installation. With batts I’m wondering if I can just push them up, knowing that a vent channel will be left.

At 24 inches, I could put two layers of r-30 batts and still have ~8inches of air gap. I would have closer to 2 inches with the 18’s

Downside to batts is that I leave “gaps” at the interior of the webs of the trusses. Cellulose would likely fill these gaps a little better.

Also wondering about the gable ends. Outlookers will be on edge, so the last two trusses are lowered so the 2×4 can run over the top of them. This creates an interesting zone to insulate, as there is less of a free running air space from eave to eave. Any thoughts on this area?

thanks for the input.