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. William Miller Miller Solar.com 805-438-5600 www.millersolar.com On Fri, Sep 25, 2026 at 12:16 PM Tyrone Houck <[email protected]> wrote: > 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! > > > > > On Fri, Sep 25, 2026, 11:35 AM William Miller <[email protected]> > wrote: > >> 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 >> >
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