| Author |
Message |
Robert E. Woodburn
Senior Member
Username: bob_woodburn
Post Number: 44
Registered: 11-2010
| | Posted on Wednesday, May 08, 2013 - 11:29 am: |    |
Though rated walls are applied as tested, for non-rated, we specify the second layer be applied perpendicular to the first, and "place first layer with ends and edges occurring over firm bearing," which implies vertical application.
A co-worker asks: "If gypsum board is 48" wide and studs are 16" on center, why not allow vertical installation of both layers with offset joints? No joints would cross. It seems like staggering the joints is enough..."
One reason for perpendicular application is tradition ("we've always done it that way"). Is there a better reason? |
Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP
Senior Member
Username: specman
Post Number: 1113
Registered: 03-2003
| | Posted on Wednesday, May 08, 2013 - 11:57 am: | |
Comply with the requirements of the tested assembly. Some will state "vertically or horizontally," and some will state "vertically" only.
Ron Geren, AIA, CSI, CCS, CCCA, SCIP
www.specsandcodes.com |
Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP
Senior Member
Username: specman
Post Number: 1114
Registered: 03-2003
| | Posted on Wednesday, May 08, 2013 - 12:06 pm: | |
Robert, I see that I misinterpreted your post.
I don't see any other reason for doing it other than added rigidity.
Ron Geren, AIA, CSI, CCS, CCCA, SCIP
www.specsandcodes.com |
Jeffrey Wilson CSI CCS
Senior Member
Username: wilsonconsulting
Post Number: 100
Registered: 03-2006
| | Posted on Wednesday, May 08, 2013 - 12:06 pm: | |
Provisions in MasterSpec, which are presumably based on industry standard procedures, describe the method suggested by co-worker: Both layers installed vertically, w/ face layer joints offset one stud from base layer joints. |
Lynn Javoroski FCSI CCS LEEDŽ AP SCIP Affiliate
Senior Member
Username: lynn_javoroski
Post Number: 1640
Registered: 07-2002
| | Posted on Wednesday, May 08, 2013 - 12:10 pm: | |
With non-rated partitions, the over-all height might govern in relationship to how much waste will be produced by horizontal or vertical orientation.
For example, 10 foot ceiling height could lean to horizontal installation - 5 panels. 8 foot ceiling height could benefit from vertical installation. |
ken hercenberg
Senior Member
Username: khercenberg
Post Number: 515
Registered: 12-2006
| | Posted on Wednesday, May 08, 2013 - 12:33 pm: | |
Agree with Lynn, for non-rated walls it doesn't really matter. Why not leave it up to the discretion of the Installer as long as the joints are overlapped?
For rated partitions, it used to be that only USG had tested their assemblies for horizontal and vertical installation. I don't know if that's still the case. |
|
4specs.com Home Page