Sprinkler pipe hung from metal deck
Sprinkler pipe hung from metal deck
(OP)
On a current project, we've gotten a request from the contractor to hang 1" diameter sprinkler piping directly from the metal roof deck using Sammy x-press anchors (expansion-style hanger installed from the bottom of the deck flute). We get these requests every so often on projects and usually refer to our steel deck specification prohibiting hanging loads from the deck. But I'm curious of other engineers' take on this. Do you sometimes allow light loads to be hung from the roof deck or always require they attach to a beam/joist?






RE: Sprinkler pipe hung from metal deck
RE: Sprinkler pipe hung from metal deck
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Sprinkler pipe hung from metal deck
RE: Sprinkler pipe hung from metal deck
Ron - these anchors are installed in the bottom of the deck rib, so I believe the anchor head does not project above the top of the metal deck (keeping it below the insulation/membrane layer). Have you experienced roofing problems in the past with these types of anchors? Just curious what may have caused these issues.
RE: Sprinkler pipe hung from metal deck
Keep in mind that one trade's work has little or no respect for other trades. While membrane penetration is easy to avoid, we still see it occasionally. Be careful.
Other considerations....
Anchor/fastener corrosion from roof leaks and/or dissimilar materials
Expansion/contraction of pipes enlarging the hole in the deck