Thursday, September 21, 2023


Make sure this important part of your RV doesn’t come loose!

An RV owner in one of my Facebook groups wrote, “I noticed this separating. Can this be repaired or should I just apply caulking to it?”

A Z-lock separating
Separation on side wall sealant to lower aluminum sheeting.

Routine inspection and maintenance are so very important when it comes to inspecting the exterior of the units. In this example, we had actually released a YouTube video advising owners about this same issue. The video looks at what a Z-Lock is on the side wall of the RV and how to check to see if it’s been secured properly.

This area is so important to make sure that it’s sealed correctly. The Z-Lock is typically installed with staples and the water gets past the top side of the Z-Lock. It can not only cause damage to the wall and floor, but it also causes rust on the staples and screws, which causes them to come loose, which will cause damage to the J metal or skirting.
Another RV owner that lost the sheeting in travel!
Most manufacturers have learned over time due to flexing and high winds that the skirting and aluminum will come loose in travel. Some manufacturers have started adding screws in the side walls of the Z-Lock to secure the molding and sheeting in place.
Check out the video below for more information and details. Thanks so much for watching! We hope this helps you to protect your unit and keeps everyone safe traveling behind you.

Please follow us on YouTube, and see our published articles on and other social media pages.

Please feel free to share your stories, problems, and upgrades with us so we can build a resource page to help others.

Thank you,


Dustin Simpson
Dustin Simpson
I have worn many hats in the RV industry through the years. From an RV Technician, Warranty Administrator, Parts Administrator, Parts Manager, Service Manager and now Business Owner. I have even been deemed an RV Expert by the California court system, working on behalf of the customers, dealers, and manufacturers. My repair facility has been servicing customers at the same location since 2003. What sets us apart from the dealerships is we are here to fix and maintain what you have, and not sell you a new one. Whether you own a million-dollar unit or an entry level, my message to you will be the same, it needs to be maintained.


  1. I recently noticed intermittent cracks in the calking along the top of the Z-lock on my 2013 Jayco Eagle Premier similar to those shown at 1:48 in the video (in several places, but not as severe). This past week I cleaned and recalked all of them. The video makes me wonder if I need to add screws. I’m going to “watch and wait” before doing so due to the following issues:

    What is behind the molding for the screws to grip? If it’s just Styrofoam they will be useless. If there is something more solid, how long do they need to be? Looking at the examples with and without screws they appear to be pretty ugly.

  2. Thanks Dustin! Great timing too. I’m going to check mine out tomorrow when it gets pulled out from under it’s cover


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