We have used Marutek molybdenum self tapping screws successfully for the past fifteen years in the Bahamas on metal truss roofs. On the East Coat, Manasquan Fasteners is our go-to fastener company.
Daryl DeJoy On Mon, Oct 30, 2023, 10:46 AM Jason Szumlanski via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > I agree that you can get impressive pull-out resistance from fasteners in > plywood decking only. Two brands that publish pull-out values are > OMG/Drill-Tec and Blazer. The #15 OMG screws are what we lean toward. > > John Mansville also has a "High Load Fastener," but I think it's just a > rebranded OMG. It comes in #14, #15, and even #21. They have published > pull-out values that are really high. If you use a base plate with 4 > fasteners with a 3x safety factor, you still get enormous pull-out values. > > Jason Szumlanski > Principal Solar Designer | Florida Solar Design Group > NABCEP Certified Solar Professional (PVIP) > Florida State Certified Solar Contractor CVC56956 > > > On Thu, Oct 26, 2023 at 2:06 PM August Goers via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Hi James, >> >> I haven't had an application exactly as you describe with a tile roof / >> plywood deck over metal trusses. However, we have installed systems with >> metal roof support structures many times. Metal self-drilling screws have >> impressive pullouts, so you might be able to use them with any sort of >> mount that you want that works with the tiles you have on site. We have >> used ELCO screws in the past, and they are now part of the DeWalt brands, >> but here is an example: >> >> https://anchors.dewalt.com/anchors/products/screw-fasteners/ >> >> and a Drill-Flex example: >> >> >> https://anchors.dewalt.com/anchors/_documents/uploads/DWANF_DrilFlex-TP-EN-rA_DDS1.pdf?1698346503 >> >> Some of these fasteners are completely self drilling while others require >> a pilot hole. >> >> Best, >> >> August >> Luminalt >> >> >> On Thu, Oct 26, 2023 at 10:17 AM James Rudolph via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> Mahalo for your response Sam. That makes me feel a little better. >>> >>> >>> James B. Rudolph >>> >>> >>> Independent Energy >>> >>> C-39784 ES #10816 >>> >>> NABCEP Certified PV Installer since 2009 #091209-155 >>> >>> C. 808.313.9701 >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> On Thu, Oct 26, 2023 at 6:08 AM Sam Haraldson <s...@onsiteenergyinc.com> >>> wrote: >>> >>>> James, >>>> >>>> I can think of one install I performed in 2017 that was a metal roof >>>> over metal purlins and we opted to through-bolt the entire array using one >>>> installer on a ladder inside and another on the roof. We employed butyl >>>> mastic and large fender washers to attach a strut frame to the roof, and >>>> then we installed traditional L-feet and rails atop the strut. I have zero >>>> experience working with tile so I don't know what your best methodology is >>>> there but I can attest that the through-bolting has held up well at that >>>> site the past five years. >>>> >>>> Sincerely, >>>> Sam Haraldson >>>> >>>> [image: OnSite Energy] >>>> <https://www.google.com/url?q=https://onsiteenergyinc.com/&source=gmail-html&ust=1677085494759000&usg=AOvVaw2NN36GoM1sjnS4RdC8Svt-> >>>> >>>> SAM HARALDSON >>>> Field Operations Director >>>> (406) 551-6135 >>>> 1515 N. Rouse Ave Bozeman, MT 59715 >>>> Locally owned and operated since 2012 >>>> [image: B Corporation] >>>> <https://www.google.com/url?q=https://onsiteenergyinc.com/bcorp&source=gmail-html&ust=1677085494759000&usg=AOvVaw0EluC1lXtz2KlRFag-htKe> >>>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. When one doesn't work, try >>> the other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. 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