[RE-wrenches] Metal Truss Roofs

[Daryl DeJoy]

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 at 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 at 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 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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