My take from listening to roofers is metal over 1/2” OSB, pull out of the fasteners is common. Just too much stress during temperature expansion/contraction over time. If the fasteners go into a rafter or thicker perlin then they usually don’t pull out.
Larger diameter fasteners does help. And yeah just like solar companies installing feet with an impact on setting 3, to many are probably stripped or really close being stripped out. I wonder if more fasteners would help the situation but then more holes and potential leaks.
I prefer standing seam with hidden fasteners.
Jay
Sent from my iPad
Tyrone:
Thank you for your reply.
Upon reflection I realized this roof is one of the very few, or the only roof, we have installed on with metal over wood. In most cases it’s metal over metal purlins. Maybe this is why I have had no previous experience with this problem. Does
this correlate to your experience?
By the way this location is at a low altitude with a very mild climate.
Thank you again.
Yep. Delta Rib/trapezoidal roofing with exposed screws is notorious for screws slowly backing out over time and progressing into rot spots and leaks especially at higher altitudes with seasonal snow/freeze and warm summers. My guess is your attachments
are less likely to be the issue than the roof fasteners. Best of luck in your investigation!
Colleagues:
I have a long-time PV client with a metal roof. This is the type of roofing with trapezoidal ridges every 12 inches. Over the years we have installed three phases of solar
on this roofing. We original caulked DPW feet onto the roof with fasteners into the framing. Later we used DPW EZ-feet with the included butyl tape.
The client informed me that have had minor roof leaks due to failure of the fasteners. To quote: “Unfortunately I chose the less expensive version of the roofing, way back
then. It has “exposed fasteners”, the screws and washers are working loose.” (No one has claimed our attachments are leaking but you can bet I will be looking at them closely.)
This is the first time I have ever heard of this type of failure. Have any of you experienced this? Can you offer any explanation on what caused this and how you dealt with
it? I would be very grateful.
It seems to me that replacing the fasteners would invite stripping of the threading into the wood sheeting.
Thanks in advance,
William
William Miller
Miller Solar
www.millersolar.com
CA License C-10 77398
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here:
http://re-wrenches.org
List Address:
[email protected]
Change listserver email address & settings:
https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/
There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/[email protected]/
https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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: [email protected]
Change listserver email address & settings:
https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/
There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/[email protected]/
https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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 AlliancePay optional member dues here: http://re-wrenches.orgList Address: [email protected]Change listserver email address & settings:https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/There are two list archives for searching. When one doesn't work, try the other:https://www.mail-archive.com/[email protected]/https://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/List rules & etiquette:http://www.re-wrenches.org/etiquette.htmCheck 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: [email protected]
Change listserver email address & settings:
https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/
There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/[email protected]/
https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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
