Air sealing baffles
Just re-reading Joe’s roof venting article in FHB and wondering about a common warning – that baffles (even for a vented attic) MUST be air sealed. If we assume that the ceiling plane is truly airtight (we are using a taped AB paper), and the wind-wash effect of a vented attic on loose fill is negligible, then why is the airtightness of the baffle important? Wouldn’t a friction-fit foamboard baffle already be better than the open cellulose in the rest of the attic? Caulking around each baffle is a lot of extra work if not truly necessary and the angle and space makes a foam gun nearly impossible.