How should they deal with the curved top of the window?

Who is "they"? Why do you ask? Have you discussed this detail, and how the vinyl siding will terminate against the trim with your contractor?

Have the windows been ordered? That's a rather unusual grid pattern.

Thanks for responding. I tried to keep it short but see now more detail is needed.

"They" is the person who will do the trim work.

This window has already been installed and trimmed with 1x4 wood and wrapped in white aluminum. except for the curved section which hasn't been wrapped and I was told it could'nt be wrapped so should be painted white. It looks terrible and unprofessional and needs to be fixed..

I was only told they would be white trimmed. I was expecting pvc or some other maintenance free material since the horizontal siding is vinyl and the windows fibergalss.

The siding has J-trim againt the window trim . Now that I think of it I didn't see the detail of how the j-trim was treated along the curved top.

All the windows and doors were selectd thru the builder and his window and door provider. It was agreed the exterior would be vinyl, white trimmed windows and the black fiberglass essential model windows.

I'm trying to find out for myslef if there is a more apprpraite, professional way the wndows should have been trimmed..

If more detail is required let me know. I'm the owner but not living in the state this house is being built. I notice this detail on my trip earlier this week to review the progress.

Thx,

Bill

Have them use a custom sheet metal shop to make them.

Have a carpenter put Azek on the sides and bottom Across the arch they can either heat the Azek and bend it or cut the arch shape out of a large piece. Of course flashing goes over top of the trim and behind the siding.

If it was to be made from an actual PVC "type" product like Azek, they'd just make a pattern and cut out of a taller board. That wouldn't necessarily match better than paimted wood though. If cladding is desired, it can be done with the face and returns as separate pieces, however it needs to be done by someone with a high level of skill to come out nice. The "lobster tail" is an option as well, although that is used more often on full half rounds.

As for the J, the arch isn't extreme so they may have been able to form that to the opening.

azek or like pvc is fairly flexible and can usually be heated or pattern cut. With linear profiles a good carpenter can also cut "kerfs" in the back so that it will bend to a window profile.

like this one, upvc arched window with grills?

this is it but not a clear picture. The contractor wrapped the side trims in white aluminum but the top curve is painted wood.

Turn the pvc sideways. It bends easily. Cut strips and stack them. Use glue in a simple curve form with waxed paper on the bottom to release. Many 3D design possibilities that go beyond the norm. This is finish carpentry. Not for installers.

This might work. Cut each half of the arch out of two boards. Splice them together and cover the seam with a 'keystone' shape.

The builder is going to remove what's there and replace with all white pvc on this window and if acceptable then do all the other windows. Thanks for the all responses.

The frame of the window is trim. The windows are black....it would be something like this, only the windows will be black.