Air sealing ceiling options & pros/cons
Not so much a how question but more bang for my buck input and any foresight into things I may not be considering.
This is new construction, vented roof with unoccupied attic, no mechanicals in attic, no can lights in 2nd floor ceiling.
Not shooting for any particular target but hoping for better than builder house so in the 1.5 ach range.
I realize that air sealing the 2nd floor ceiling and my lowest levels (sill etc) is at the top of my air sealing list. From reading on here I’ve found a few strategies for the ceiling and wondering about the best bang for the buck here.
1) Let framers put up partition walls w/nothing special, rock the ceiling, and then I try to sneak in behind them and caulk all the gyp to plate gaps before they do the walls. This seems like a good diy exercise and this option is the cheapest and least likely to ruffle the contractors feathers. Assuming I’m somewhat competent with this method how effective is this? It’s the most attractive if its reasonably effective.
2) have the ceiling rocked before partitions are up. I’d still need to come around the caulk the perimeter gaps to plates and this is out of sequence. I might be able to convince my framer to just do this rather than have the sheetrock guy come and go – but either way will take some sequencing with guys that want to go fast. This seems like it might be an ok option if I can get the framer on board and he plans for it.
3) have framers give me a 3/4″ strip of ply at the top plates and tape over may plates onto this. then have them give me 1x strapping on the u/side of trusses and 3/4″ ply strips where each partition will go. Then all my ceiling can mate up with the ply and other than a bit of sealant I’m not asking them to do anything special or out of sequence. Downside here is a decent amount of extra framing material and labor.
4) sheathe the u/side of trusses and tape the joints, strapping over this for the gyp a service chase. Clearly the most involved/expensive.
Any input on the relative merits of the above options?
From talking to framers it’s all about speed – they estimate being framed in about 7 working days, said to assume 2 weeks total to account for weather and surprises. So it seems that anything that slows them down they’ll punish me.
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