SFGate

Becky This is in a friend's lodge house. It's at least 30 ft high. The stones just stopped at the ceiling.

eagledzines Here are a couple pictures. This would be my choice.
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Open porch with stacked stone fireplace from Atlanta Decking and Fence Company

Also, the third picture shows a beautifully finished hearth.
Sammamish

Yarbro Home Improvement LLC The stone mason can cut the stones at the angle of your vaulted ceiling. Don't install a flat cap. Its a catch-all and how will you clean it? Lowering the hearth is a mistake in my opinion. Comfortable seating height is 16 inches, if in fact you want the hearth used for that purpose

eagledzines You will have a very tall fireplace on the outside of the house to get a good enough draft. I believe it has to be at least 3' above the roof peak.

Ironwood Builders If you are concerned about the masonry being too tall or the way it looks against the ceiling, consider a shorter masonry stack and building out the drywall above the mantle. Layering even a 2X4 wall on the existing wall gives and architectural addition and some dimension to the surfaces. BTW, the typical code for the top of the flue is 2' higher than anything within 10'. Your roof looks steep from the photos, maybe a 12/12 (45 degrees)? If I am doing the math right in my head that means the top of flue is 12' above the point where it exits the roof. Lower pitch means a shorter chimney....draft is more about firebox construction and lower chimney flue(smoke shelf) construction than height. Sometimes an extremely tall flue is subject to wind pressure and draft problems because of that.

mdamron61 I don't think the stone should be taken up to the sloped ceiling. Stop it a foot or so above the opening and cap it with a mantle. Then you can place a nice painting or flat screen tv above that.

Fedor Construction Specialties, Inc I like Ironwood's idea about building out the drywall above the stone. It would add depth and dimension, plus you would have a great palette for some large artwork above the fireplace.

spmm Fabulous space, and views, do you have to use stone, seems a bit folksy? Stainless steel wide border around hearth perhaps

spmm With the flat slate look stones in front as a 'seat' as in the original picture

Natalie Hi---deifintely build the wall out and stop the stone where the wall meets the angle of the slope. I recommend NOTHING above the FP---you have enough going on in that area. Situate your TV and art elsewhere---let the stone stand alone... Soften the lines with floor to ceiling window panels... Good Luck!

DIAspoton taking the stone to the ceiling seems like overkill for a home. it should be a focal point without overwhelming.

Aldrich Incorporated It's the most critical part of the application but essentially you just let the stones terminate at the ceiling as other have said...I'll attach a few pics. Good luck.

edmontongirln18 Thank you all for your thoughts and ideas, I really appreciate all
of them. Not a big fan of the stone, it is just leftover from the front of the House, I thought the Mantel would look 'lost' by itself in a Great Room.
This is our Sons house that we are building. (not my cup of tea at all). I lean more toward traditional style. No Vaulted ceilings for no and NO TV's on Fireplaces either!.

spmm TV at that height is ok if you watch standing up, or don''t mind getting a sore neck :)