It won't get any better.
Is there plywood or osb under it?

I would say it is normal with standing seam unless your frame is perfect and your installer.

 

It won't get any better.
Is there plywood or osb under it?

It's OSB under it.

What would need to be done to correct it? Would it need to be pulled up and re-installed?

They've just given this contractor a good hunk of change and it looks not-so-good.

House built in 1991. Previously had shingles. Cape Cod style with two dormers. Just trying to answer any other potential questions in advance.

And, I must have misunderstooding what it was being called, oil canning then.

Thanks.

 

Around here they call it oil-canning. I am working on a job now, we built this all steel building for him , when we put the roof on, when the sun hit it , it looked that way. We tore it off and put 3/4 osb under it and did it again and it is better, but you still see it.

 

It's called oil canning around here. Not unusual, bu that looks worse than most I have seen. (alot depends on the angle of the sun)

The way to reduce this effect is to incorporate "striations", small ridges in the panes when the panels are formed. Sometimes these are speced, sometimes not.

The wider the panel the worse this effect can be, these look to be 24"? probably too much without striations.

 

That does look crappy. What is the metal. Aluminum, galvalume? What is between the OSB and the metal? I've got some copper on my roof. 5/8" cdx 16" oc rafters with sheathing clips. Hi temp ice and water on sheathing and site bent panels. Nothing like that at all.
Is it possible they fastened the panels down too tight in those spots and it is causing that look? Did it show up right away, or did it take a few days/weeks to show up?

 

I can give you a quick explanation of some reasons why it can happen. You will have to determine on your own whether there is a structural fault or an installation fault. It is not cut and dry as to the responsibility.

Standing seam has 90 degree bends in the edges of the panels. The bends want to force the panels to stay rigid and straight.

When the panels are forced to conform to a surface that is not flat, the panels start to become deformed and ripples or oil canning can occur.

The roof panels are not 100% rigid and there is some ability to conform, but there is a limit.

A roll forming machine that is out of whack can make panels that have a slight twist or curve to them. If this is the case, trying to lay them on even a roof that has a nice flat plane can give bad results.

If the roof plane has undulations that the panel resists conforming to, it will oil can.

Installers may occasionally cause a ripple by over driving fasteners in a low spot in the roof deck. This situation is sometimes avoidable if the installer has some experience.

Improper handling of roof panels can also cause deformations which will show up as oil canning. This can happen during shipping or on site.

Was the roof rolled on site or was it delivered in crates?

Almost all standing seam roofs will display some amount of oil canning. The left side of the picture you posted has a fairly severe case IMO. The right side is more like the worst case I would like to see on any installation.

It's a pretty small area that you have pictured. Is it really representative of the installation as a whole?

 

Tape caulking backer rod down the middle of each panel on the backside

 

That looks terrible. It should be fixed. When I have had to put mettle over an un flat surface I put down 1x4's and shim them to create a flat plan to attach to. It doesn't take that long and makes a big difference.

 

It may just be the pics, but looks like you can see the 'belly,,,

 

Around here our standing seam is mostly 16" planels with ribbing rolled in , not flat panels like in the pictures.

all it takes is a roof that is not flat and tightening screws down to much to get one to look like that. Which I tend to believe is the problem here. Flat metals show up way to much stuff. personally I would prefer not to use a panel like that.

Although I do believe some of it can be in the way it was rolled or handled.

 

We have just ran over 700 square of T-panels, and none of them look like that. This building is crooked as a dogs hind leg.

Those look like dents from improper handling or over drive, as someone has already mentioned. How wide are the panels?

 

Look at the roof early in the morning. Does it look the same when it's cooler or is the oil canning worse when it's warmer or in direct sun?

It looks to me like the panels were damaged before or during installation or were forced over a hump or slump as noted above.

If the oil canning lessens when it's cooler, they may have it screwed down improperly. A piece of nylon rope stapled to the roof below the center of each row (a different method was mentioned above) will create a "crown" in each row and help reduce the oil canning from the inevitable heat expansion.

What you've shown is unacceptable at any rate and should be removed. Look closely at the panels when they are removed and see if the imperfections remain. If it's oil canning, it will go away when the panel is loosened.

 

To me, them panel look creased at the rib, I as a contractor would of already resolved the problem. Make them fix it right

 

Kinda hard to tell but but it looks like the creases start on the RH side, Id guese its an issue with the clips , screws, or how they were atached.

 

Oil-canning has nothing to do with installation. All metal will be subject to oil-canning to some degree. It is basic physics. Metal expands and contracts with the temperature so it's all a matter of what you are using and how it is installed as to the degree of oil-canning.The thinner the metal and wider the panel, the more prone to oil-canning. Striations and pencil-lines are not just for aesthetics. The slight bends help to absorb and hide the effects of what oil-canning will naturally occur. Obviously a smooth panel is not only going to show oil-canning, but any other defect in the panel. Even the best can't avoid some defects showing.

Unfortunately, what you have there is not oil-canning at all and is probably visible on most days regardless of the temperature. It appears to be a static panel (flange, not clips) and that would be your first problem. Screwing a rigid metal panel to an uneven deck something has to lose and it will be the panel. Near every one of those creases you are going to find a fastener that is installed too tightly (why they are so random I don't know) but don't shoot the installer yet. On a thin (I'm guessing 26ga at best) smooth panel like yours it does not take much linear stress to warp the panel. Unless that panel is basically laid on the roof to rest, and then snugly secured exactly how it is laying, it will have stress points and what you have in your picture is the result.

Also most mfrs have a "deck disclaimer" which usually says something like "no more than 1/4" belly in 20' on the surface of the roofdeck."
Unless the installer screwed up your installation or your panels are faulty you probably will live with this result as it's not the mfrs fault as every one of them has an oil-canning disclaimer as well as a deck-deflection disclaimer and that is what this will be called.

Sorry, but the original problem here is the choice of panel to install. Better care on the installation side would have mitigated the issue to some degree but it isn't entirely the contractors fault other than inexperience in this area.

BTW, love your tool line

 

Good example of what happens when installers are careless handling sheets. 100 % installers fault. Every sheet is bent in the middle . Either one guy handed the sheets up and the guy on the roof just pulled it up and over dragging the eave creasing every sheet or two guys carrying the sheet flat . Either way this is NOT normal.
Definitely looks like light gauge steel.

 

Good example of what happens when installers are careless handling sheets. 100 % installers fault. Every sheet is bent in the middle . Either one guy handed the sheets up and the guy on the roof just pulled it up and over dragging the eave creasing every sheet or two guys carrying the sheet flat . Either way this is NOT normal.
Definitely looks like light gauge steel.

Wow... bent in the middle...:laughing:


I can guarantee if they removed those pans there wouldn't be a "Bent In the middle" ...

24 gauge snap lock isn't very easy to bend...

somebody cranked them to the deck and the deck is dippin.

 

Thanks for all of the responses, guys. I think I've got the information my folks were looking for. To answer some of the questions...

They think it's 24 gauge, snap lock clips of some sort, and there was synthetic paper between the roof and metal.

 

Oil Can

The panel looks to be 26 gauge 18 INCH lok-Seam
This panels needs a flat support such as Ply Wood even 24 gauge will show each dimple nail or shingle that is under it. But the answer to your questions is heat from contracting and anything under the panel will show thru this panel.

 

The panel looks to be 26 gauge 18 INCH lok-Seam
This panels needs a flat support such as Ply Wood even 24 gauge will show each dimple nail or shingle that is under it. But the answer to your questions is heat from contracting and anything under the panel will show thru this panel.








''the heat from contracting''...what do you mean by this?

 

All Hail Furer Struble!

 

Contracting from heat maybe? I don't know what's wrong with the roof, but sure glad it isn't mine. It does look like crap.

 

Contracting from heat maybe?

All over the world millions of elementary school science teachers heads all explode... :laughing:

 

Mueller sells a 7/16" foam roll to put down the middle of the underside of each panel. Each panel will then have a slight (almost imperceptible) crown. Theory is when the panel expands, it will absorbed in the crown, instead of oil canning. Some guys use it, some guys don't. It definitely helps. The wider the flat area between ribs, the worse the oil canning is.

Edit: now that I went back and looked at the picture, what you have doesn't look like oil canning. Installation problem...

 

Contracting from heat maybe?

All over the world millions of elementary school science teachers heads all explode... :laughing:

I was trying to translate what steel man had said for struble. I might need some translation for all of it though.