Here's a photo of sloped ceiling. I'm open to other design ideas. Should I consider floating mantel?

Just make sure your TV is at a good viewing height....most mantels are too high.

@erinsean What is a comfortable height for mantel to mount a TV above it? The one I pick is 42.5" high which I think may be reasonable height sitting down.

The center of your TV screen should be about 42" from the floor. As erinsean said, most mantels are too high.

Chloebud gave you the measurements and I agree. It is nice seeing the TV and the fireplace at the same time, but comfortable watching is important also.

The big window is a very dramatic feature do you intend the fireplace to compare with the drama or be more understated?...

@btydrvn I want the fireplace to be understated. I am thinking to have flat sheetrock wall behind the fireplace. I plan to have faux ceilng beams like below photo so is debating between the two options below:

Option 1: Should I do tiled area behind fireplace + floating mantel? With the floating mantel then I can get the viewing height I want for the TV.

Any suggestions for a tiled look behind fireplace.

Option 2: Should I do flat sheet rock and go with a traditional white non-floating mantel?

De Sola Terrace, Newport Beach · More Info

For your more understated flat fireplace i would stay with a floating mantle and sheetrock wall...stone or tile seem more believable if the fireplace projects into the room a little..not flat to the wall...keeping it flat and understated seems more appropriate with the limited space...while the ceiling beams will be the right drama and scale with the big window