Irregularities on roof

What are your thoughts on this image? This is in the Dallas area and it is currently dry and hot. Some feedback I've gotten so far is possibly a heat issue. I went back out the other day to take another look. It looks structurally sound and ventilation looks adequate. Although we're dry, I didn't see anything on the roof deck that indicated moisture issues or swelling at the deck joints. H-clips also appeared to be installed fine and baffle installation appeared adequate. I wasn't able to physically confirm that each of the soffit vents were, in fact, cut out because it's a 2 story home.

At this point, I'm leaning towards cosmetic irregularities that seem to be more visible as the sun hits it at the right angle (mostly morning and evening times). Similar to when you shine your flashlight parallel to the drywall and the irregularities pop out. I noticed a house across the street that also has these irregularities.

Any other thoughts?

Kris:

I think it's just so hot the joints are telegraphing through the materials. Not an issue.

Thanks.

I think you'll see that visual anomaly even when it isn't as hot outside. The sheathing may have gotten wet before the underlayment was installed.

The angle of the light hitting the roof can also exaggerate the effect, by highlighting the shadow lines.

Dom.

Thanks guys.

Here is a better image...
Its OK!

It happens here when it is below zero as well.

It doesn't seem to be a major issue, but you can get it checked by professionals for your satisfaction.

I see that all the time especially with 5/8 OSB and the spacing of the rafters at 30 inches it just flexes and bows some from expansion and contraction. You will see this a lot in the mornings too when frost as well. But it's not a issue. it's common in today's construction. And the time of day makes all the difference as to when you see it the most. I have had clients ask me about this many time here in Oklahoma.

I agree with the other reply in this post, the effect has to do with the angle in which the photo is taken