How to Hang Airtight Drywall

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How to Hang Airtight Drywall

I was watching the GBA/FHB video "How to Hang Airtight Drywall on Ceilings"...
http://www.finehomebuilding.com/how-to/video/hang-airtight-drywall-on-ce...
and boy howdy .. they sure used a lot of "gooey stuff"...
I understand how the adhesive on the rafters may add to racking strength and may help avoid fastener pops.
However, I don't understand how the adhesive (on EVERY rafter) contributes to the air barrier???
It seems to me that they are putting a lot of gooey stuff in places where it is not necessary (as part of an air barrier)...

In this BSC Airtight Drywall Approach PDF
http://www.buildingscience.com/documents/information-sheets/air-barriers...
...Notice that they do not put gooey stuff on EVERY stud....instead the gooey stuff goes at the perimeter of the drywall and where the drywall "changes plane" NOT in the "field" of the drywall.
Why does Myron need to put Gooey stuff on every Rafter?

It also looks to me like they may be missing "backer" and Gooey stuff in other places where it is more important.

myron ada.PNG655.75 KB
Asked by John Brooks
Posted Thu, 11/15/2012 - 08:22
Edited Thu, 11/15/2012 - 08:29

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