[RE-wrenches] Metal Truss Roofs

[August Goers]

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 at 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 <sam at 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>
>>
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