I ran into this when questioned many years back. It boiled down to the listing of the device. IN this case ITW (Sammy Screw).
The screw was not listed for the loading along a slope. All of the install documents reflected a straight, not angular, installation. This is true also since the weight pulling backward on the screw will revert it back. There are now ones available with a built in swivel. R/ Matt -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Cahill, Christopher Sent: Friday, November 20, 2015 6:39 PM To: [email protected] Subject: Hangers In Angled Structural Members What angle should a screw be driven into a z-purlin that is on an angle? These are into the bottom flange of a z-purlin, not the vertical portion of the purlin. Slope was greater than 2:12, say 3 or 4:12. Basically can the screw be driven vertically so it's at an angle to the plane of the material it's penetrating or does it have to be perpendicular to the purlin thus a swivel would be necessary between the screw and the rod to get the rod into the vertical position without bending the rod? I suppose even if the vertical section of the purlin was used the question is the same. Do you screw those horizontal or perpendicular to the section and use a swivel to get back vertical? If these were I-beams or the bottom chord or a truss would that be different? Chris Cahill, PE* Associate Fire Protection Engineer Burns & McDonnell Phone: 952.656.3652 Fax: 952.229.2923 [email protected]<mailto:[email protected]> www.burnsmcd.com<http://www.burnsmcd.com/> *Registered in: MN Proud to be #14 on FORTUNE's 2014 List of 100 Best Companies to Work For _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
