Jay,
I researched this years ago, so I have no specific figures for you such
as pullout strength, only the general lesson that I learned. The pullout
strength of Tek and similar self-tapping screws is surprisingly high,
especially in the larger diameters, such as #14, which equates to 1/4"
as I recall. As long as the purlin into which you're drilling and
threading is of sufficient thickness to resist deforming and tearout
(your 3/16" should be sufficient), the screw will not tear out under
more-than-normal wind loading.
You should be able to find actual values via online research, as I did.
Allan
On 10/17/2020 8:11 AM, Jay wrote:
What do people recommend for a metal roof ( with flat sections, not
corrugated)on 3/16” thick x 2” wide C channel for attaching L feet
Self taping fasteners would be the easiest. Doing a nut and bolt would be
possible but quite time consuming.
A machine self taping bolt and then adding a nut would be a lot easier than nut
and bolt.
But that is my question. Is a self taping screw enough or does it need to be
bolted?
Jay
Peltz power
--
*Allan Sindelar*
[email protected] <mailto:[email protected]>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
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