Searching for a "positively anchored"...

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Author Message Nathan Woods, CSI, CCCA, LEED AP Senior Member Username: nwoods Post Number: 825 Registered: 08-2005 Posted on Friday, August 21, 2020 - 03:10 pm:    I have a roof top plaza in a hospital, in California. We planned on using a standard pedestal/paver system over a sloped substrate. OSHPD wants that paver system to be positively anchored (Screw/bolts or clips). Anyone know of such a system? Colin lists a number of paver companies, but searching for an anchored system is not as easy as I hoped: http://www.4specs.com/s/07/07-7600.html?zoom_highlight=pavers Brian Payne Senior Member Username: brian_payne Post Number: 220 Registered: 01-2014 Posted on Friday, August 21, 2020 - 03:12 pm:    Arg...putting a million holes in a roof is a great solution. Did they give you any indication why? ken hercenberg Senior Member Username: khercenberg Post Number: 1295 Registered: 12-2006 Posted on Friday, August 21, 2020 - 03:21 pm:    Do you mean something like this https://www.hanoverpavers.com/guardian-paver-system or http://www.tecturadesigns.com/products/pavers/lok-down-wind-uplift-resistance-system-rooftop-paving or http://ezypave.com/installation/wind-uplift/ Not cheap or necessarily easy. You'll need to consider perimeter conditions and a lot of other factors. Good luck. Brian Payne Senior Member Username: brian_payne Post Number: 221 Registered: 01-2014 Posted on Friday, August 21, 2020 - 05:00 pm:    If so, I misunderstood the question. Is the pacer to be secured, or the whole system (paver and pedestal) to be secured. I know Wassau or Hanover is working on a more concealed version of their locking system. Haven’t seen it yet. Michael Chusid, RA FCSI CCS Senior Member Username: michael_chusid Post Number: 551 Registered: 10-2003 Posted on Friday, August 21, 2020 - 06:43 pm:    Against what forces is the system to be secured? Years ago, I had to prevent roof pavers from blowing off. It was enough to secure each paver to the adjacent ones to make a mat that we felt would resist blow-off dislodgement better than individual pavers would. Michael Chusid, RA FCSI CCS 1-818-219-4937 www.chusid.com www.buildingproduct.guru Nathan Woods, CSI, CCCA, LEED AP Senior Member Username: nwoods Post Number: 826 Registered: 08-2005 Posted on Friday, August 21, 2020 - 06:49 pm:    Ken, thanks for the quick response. I am not sure about these type of systems. OSHPD's concern will be with seismic/lateral movement, not such much about wind lift, though that is also a factor. Edit: Hours later, I see this tab is still open in my browser. Sigh.... I meant to reply earlier. Sorry! Brian Payne Senior Member Username: brian_payne Post Number: 222 Registered: 01-2014 Posted on Friday, August 21, 2020 - 07:45 pm:    Hanover has the Staybar system with diagonal cables, but only required for heights 16 inches and higher. Sounds like a “personal” issue rather than a warranted issue with the product. Good luck! https://www.hanoverpavers.com/images/PDFs/ARCH19.pdf Steven Bruneel, AIA, CSI-CDT, LEED-AP, EDAC Senior Member Username: redseca2 Post Number: 686 Registered: 12-2006 Posted on Saturday, August 22, 2020 - 02:41 pm:    From experience installing paver systems in California Hospitals reviewed by OSHPD, the issue is in the pedestal system, which will require anchoring of the pedestal as well as seismic bracing. The pedestals must also resist lateral shifting of the pavers, but this is usually a standard feature of he pedestal head design. Mark Gilligan SE, Senior Member Username: mark_gilligan Post Number: 943 Registered: 10-2007 Posted on Sunday, August 23, 2020 - 04:52 am:    OSHPD is concerned about seismic issues. There have been problems with computer floors collapsing during earthquakes and they see this as similar. I would ask whether the hospital could operate if the system of pavers had collapsed. Ask the plan checker what code section he is quoting. If it is on the roof and used as a social space I suspect that the concern is misplaced. Still it may be easier to accommodate the plan checker. Can you use a variant of the bracing systems used for raised computer floors? Involve the project structural engineer. If they have done hospitals before they should be familiar with the drill. California hospitals are a unique experience.