How To Install Z Metal On A Standing Seam Metal Roof. Step By Step Zee Bar Installation Instructions

Z metal closure is used when metal trim needs to be attached to the top of a standing seam metal roofing panel. The zee bar provides the trim with something to attach to and creates a fixed point of contact. It's used most frequently at the ridge, peak, transition, and endwall.

In this video we will show you how to install z metal on standing seam metal roofing. This is an advanced standing seam installation method that will give you additional protection from water intrusion on your metal roof.

00:00 How to install Z metal on a standing seam metal roof
00:59 How to measure zee trim for a standing seam panel
01:49 How to cut z flashing on a metal roof
06:47 How to install mastic tape for z metal flashing
10:41 Zee trim installation for standing seam


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How To Install Z Metal Trim On A Standing Seam Metal Roof

There are multiple methods to cut z closure that’s used on most standing seam applications. There is a standard square cut, and then there is a more advanced way which we will guide you through in this article.

Measuring Z Trim
Cut your zee closure ¼” less to allow space for your butyl mastic tape to be installed.

Marking and Cutting Zee Trim
1. Mark the width of the z trim needed and add 2” in the measurement for the folds on the zee closure.
2. Write “Top” on your closure so when you make your cuts, the top and bottom are clear when you go to cut.
3. Square off the line and make a mark at 1”. Your two marks will be your cut line and your fold line.
4. Repeat this process on the opposite side to create another cut line and fold line.
5. Cut the zee metal on the cut lines you’ve created with metal cutting snips.
6. Take the bottom leg completely off on the far end.
7. Fold in on the fold line with your hand or a metal bender.

Mastic Tape Layout for Z Flashing

You’re going to be running a continuous piece of mastic tape all the way across the panels up over the highs to create more of a waterproof seal.
1. Mark for your panel on the high on the end where the transition trim will be. Make a mark 1/2” from the edge of the trim.
2. Take the z bar and put mastic tape on and measure to the center of the bottom flange.
3. Measure back 2 ⅜” and make a mark on the roof panel.
4. Repeat this on the other side of the roof to snap chalk lines.
5. Once all highs are marked out 2 ⅜” back from the zee bar, go through with a straight edge and mark out the pan of the panels to give a good idea of where the mastic will be going.
6. When all marks are made, place mastic up over the top of the high and then make sure it’s seated well into each of the corners of the panel. NOTE: Don’t tighten the mastic too tightly or it will start ripping.
7. Once the mastic tape is pressed down tightly, remove the liner.
8. Repeat the cutting process on the other side.

How To Install Zee Closure
1. Use a drill with pancake screws to fasten.
2. Always consult with an engineer to find the proper screw spacing.
For our example, we will run about 4 screws per piece of zee closure.
3. Caulk the backside of the highs and fill all of the backside voids with silicone sealant.


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