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=?iso-8859-15?Q?Tekkie=AE?=

posted for all of us...

On Thu, 17 Aug 2017 21:43:50 -0400, wrote:

I understand some drywall installers prefer horizontal installation
but I am curious how NFPA feels about a taped joint vs solid drywall
in the 15 minute fire rating. It is also easy to argue that the taped
joint across the stud bay is not as strong (against impact) as one
that is over the stud.

I believe the NFPA is silent on the subject, and there is never more
than 14.5 inches between supportd (assuming 16 inch centers) The big
advantage is you don't have floor to ceiling joints to telegraph
through every 48 inches, Vertical joints are MUCH more visible than
horizontals due to the way light interacts.

That would not be 100% accurate.
This is the ICC structural code chapter 7
Footnote to
TABLE 721.6.2(1)
TIME ASSIGNED TO WALLBOARD MEMBRANES
(Goes on to list various types of wallboard and the fire rating)

"b. Gypsum wallboard installed over framing or furring shall be
installed so that
all edges are supported..."

Thank you for the reference. In my eyes this makes vertical install
mandatory... But then again what do I know...

--
Tekkie