Call Anderson.

Some variance with larger sections of glass is normal, but I would go straight to the source here. They should be able to clarify it and if it is significant, it may indicate an issue with the IGU. Andersen fairly famously had some IGU issues in the past that would cause a large deflection in the glass.

I would have the airspace gap checked for uniformity edge to center of IGU. I have a laser that measures it precisely, but you can also get an idea by running a flashlight along the interior pane & watching the two reflections as you move it.

I ahve huge windows in my house and do not see that problem , I would talk anderson right now.

That is not normal. I would contact Anderson. The earlier in the building process the easier for them to address the problem without holding up the rest of your building schedule (just in case).

Depending on the severity of it, the reflection that you are seeing may just be the low e coating that wasn't on the original windows. Do you know which low e was used? Is it worse at night when it's dark outside and you have lights on?

It's new construction

Sure have seen a lot of complaints w/these Andersen 400 series. have you contacted them? Seems to me that should be your first course of action.

Told my builder about it and asked him to get in touch with them and check it out.

Reflected Sunlight

Can your windows melt the neighbor's siding?

UPDATE: Andersen is sending a measuring tool, should have it next week and will update post.

UPDATE: Supplier examined them and said measurements are fine, could be caused by cold weather. It's now warm, still have the problem. Andersen HQ said an improper installation could be the culprit. Getting a second opinion as suggested by Andersen HQ.

hmmm... installers frequently try to blame the product for their faulty installs, and make no mistake, there are more instances of install related issues than product defects. That said, that seems unlikely here. It sounds like a product issue, the question is whether or not it falls above or below the threshold to be considered defective.

Second opinion sounds like a good course of action at this point. On the plus side, if the IGU's ultimately do need to be replaced, that should be able to be completed by swapping glass as opposed to the entire frame. I'd imagine that your build has progressed substantially since January, so that means that this wouldn't undo a bunch of that work.

Oberon476 - Good observation! My plans do say tempered glass. Looks like rollerwave distortion is present on large tempered glass windows, but the level of distortion that is considered the standard becomes the question, perhaps? Is this level of distortion acceptable,and how does one determine that? Hmmm.

That does not appear to be an install related issue. Its quite possible the LowE was put on the wrong glass pane. Also, that seems to be a white haze that is common with surface 4 hard coat lowE during certain times of the year. That said, anderen uses cardinal glass which offer I89 surface 4 and that product will not cause a haze.

I would ask the builder to give you the glass specs to find out which glass package your windows came with. The fact that those particular units are somewhat low to the ground, they are probably tempered.

What is an installation concern is that the flashing tape and probably nail fin appear to be set over the building if paper instead of under. Improperlapping that will direct water into your wall if or when the seal on that tape or the integrity of the paper fail. You may think it’s not a problem being under the deck, but for one, all other windows are probably the same, and for two, deck ledger board flashing is screwed up on the regular and I see them as leak sources more often than not. Forget about the glass and take a look at a real problem