My Industrial Cabin Build

[WoodChuckDad]

Yep. I think they did. Looks like I have some work to do on it.

 

[EddieWalker]

The flashing for the vents,yeah iI am going to address that it will have to be an adhesive seal. You do not screw things thru a standing seam metal roof. They are supposed to float.

I don't understand this. How does a metal roof float when each panel is nailed to the roof the full length of the panel.

Floating floors are not attached to anything. They stay in place from it's weight. Your roof is nailed in place, so how does it float?

At 18:40 into the video you can see the nail gun being used to nail each panel to the roof.

 

[WoodChuckDad]

They are clipped and nailed on the edges and are supposed to move freely in the middle for thermal movement. There are several types of clips that hold the panels to the roof. Some basically let it float up and down the roof with expansion and some are fixed. I don’t know which ones we’re used on mine. But the center of the pan is supposed to float free. That is why you get oil canning on some roofs.

 

[ovrszd]

In our previous house I laid Laminate Flooring in the kitchen/dining area. Was told to not fasten it down and to always leave a slight gap at the walls so it could "float". When I was done I moved the cabinets in and filled them with a hundred pounds of kitchen products. Moved the kitchen stove in. Moved the dishwasher in. Moved the Refrigerator in. Dining table and chairs. All setting on the "floating" floor...... Floating, right.....

 

[BigBlue1]

In our previous house I laid Laminate Flooring in the kitchen/dining area. Was told to not fasten it down and to always leave a slight gap at the walls so it could "float". When I was done I moved the cabinets in and filled them with a hundred pounds of kitchen products. Moved the kitchen stove in. Moved the dishwasher in. Moved the Refrigerator in. Dining table and chairs. All setting on the "floating" floor...... Floating, right.....

I get what you're saying, but ultimately the floor does generally have the ability to expand and contract somewhat. If you ran the floor right up to the walls then it would have nowhere to go when it expanded (due to temp change or humidity) and it might buckle. Myself, I have a pool table and a very large and heavy dining/bar table in our lower level on floating LVP flooring so the same thoughts have crossed my mind but I came to the above conclusion.

 

[deezler]

You do not screw things thru a standing seam metal roof. They are supposed to float.

True, but I think having a durable and permanent, weather-sealed roofing protrusion is more important than each roofing panel being 100% floating. My roof definitely does some pings and pops on a cool evening after a sizzling summer day. But 32 foot long panels will do that; no problem.

 

[s219]

The clips on a standing seam roof should allow the roof to expand and contract with temperature (only one end is pinned). But it always made me wonder how a screwed in metal roof is expected to behave normally. Thinking about the roof I just put in, each panel has about 36 screws. Nobody ever worries about expansion/contraction with those panels even though it must happen.

 

[EddieWalker]

They are clipped and nailed on the edges and are supposed to move freely in the middle for thermal movement. There are several types of clips that hold the panels to the roof. Some basically let it float up and down the roof with expansion and some are fixed. I don’t know which ones we’re used on mine. But the center of the pan is supposed to float free. That is why you get oil canning on some roofs.

I'll take your word for it that this is happening. Watching the video, it looks like he nailed each panel into place just as tight as it was possible with that nail gun. How much movement do you get in 12 inches, I have no idea.

If it was me, I would screw the flashing right through the metal and into your decking below with a lot of sealant so it comes out and makes a big mess. Then happily clean up the mess knowing there was a 100% complete seal that will never, ever leak.

Since it's not my roof, I think you should contact the manufacturer of the roof and ask them what would happen if you screwed the flashing into place.

I have zero confidence that you can glue it on, and that it will remain glued on for any period of time. It might last a year or two, but between the heat and freezing that occurs on a metal roof, along with movement from the heat and freezing, and even thunder storms, that glue is going to fail eventually.

 

[dstig1]

I agree with Eddie 100% here. Your first call should be to the roofing manufacturer (or their website). Odds are they have details on their website that covers installation instructions for roof penetrations.

 

[WoodChuckDad]

This roof was formed in place. The metal came on a flat coil roll and was formed into roofing pans on site. And I will be on the roof each year checking and cleaning my chimney. At least until I’m too old to do it myself. I could use panel adhesive and it would never come apart. But then if the boot cracks or dry-rots I won’t be able to change it. I’ll figure something out. But I’m not planning to screw it down.