Flashing Wires and Pipes Through Steel Siding

Pole Barn Guru Blog

Flashing Wires and Pipes Through Steel Siding

There are some things one just does not give a lot of thought about and this subject is one where I am entirely negligent. My post frame buildings outside of Spokane are both sided with 1×8 Cedar channel. While it looks great, I would never do it against due to having to solid body stain it repeatedly. Maybe this will be a story for another day?

My negligence?

Not having paid attention to how to adequately and permanently seal pipe or wiring penetrations through roll formed steel siding. I went out and looked at our own steel sided shouse (shop/house) and for our contractors like to use liberal amounts of caulking. I just do not see this as a permanent design solution.

This was a post in one of my Facebook Barndominium groups:


“First this isn’t my building! But I will need to have some piping coming thru the side of my building soon. Also need to think about water spigots, securing them to the building (not just to the metal siding)

How do you penetrate a metal building siding and seal this penetration from water intrusion and/or prevent it from rusting in the future.

I have a hydraulic punch out tool to smoothly cut the size needed (i have up to 4in die’s) but sealing AM<he metal to piping (pvc, metal, copper what have you) is my hold up. I don’t want to just caulk it up, I feel there has to be a better and  more long term solution, metal/plastic flashing?”

Mike the Pole Barn Guru writes:

There was a suggestion made of a silicone flashing product, however when I visited their website, I was unable to locate any data on exterior use.

There is a product available for sealing pipes going through roll formed steel roofing: https://www.hansenpolebuildings.com/2012/09/dektite/. I have used them several times and find them to be 100% reliable.

I have spent some time Google searching for a solution similar to Dektites™, but to no avail. Somehow I believe there is a well-hidden product available. If you happen to know of a great solution, please share it with me. It is not often I am stumped – this one has me.

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