Shiplap is a profile intended for walls and not normally used on a ceiling.

Will you have exposed beams or other to break up the ceiling?

None.

The beams look beautiful. Are they part of trusses?

You can get a ship lap look by using a tongue and groove on the ceiling.

Tongue and groove, 6" exposure, would work well.

Have you though through your idea? Ship lap would have different directions on each side of the sloping ceiling, making it impossible to install on the flat portion of the ceiling.

Stick with T&G and you'll be happy.

I would get as wide as you can, maybe 8 inches. What are your options?

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This room has shed dormers like your. Notice they did not do shiplap in the sides.

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I like that white example. I agree ask how thick you can get locally.

All of the photo examples above have simple gable pitched roofs.

Your problem is the flat portion of the ceiling. And that's why shiplap siding will not work.

Shiplap isn’t suited to your architecture. Or anyone’s architecture

Actual shiplap was meant for barns and outside buildings waht you are going for is just tongue and groove boards and IMO not working in your space,

Why is the door not centered on the wall with the window above in your second pic?

Drywall it first, as you need to do for air sealing and fire resistance, and decide on a ceiling treatment later. You may decide that you have enough going on to not need a focal point on your ceiling.

I don't get why people have an issue with this idea. As your pictures show, it can be done with or without trim.

That is not shiplap. That is the underside of roof decking in a home without proper insulation or air sealing.

I think those ceilings are beautiful Diane! Your ceilings will look great!

The visuals of the underside of roof decking with structural beams will be quite different from a surface applied wood coating. You will have issues where the ends of the individual boards meet. You will have issues where the different ceiling planes meet. The easy solution will be to add moldings to cover those areas, which will detract from a clean lined simple look. And that means dividing the ceilings up into no more than 8’ sections. Now you’re developing a bit of an off kilter coffer look.

Start with the drywall. Anything else can be added at a later time. After more design time is devoted to overcoming the issues that it creates.

Here's how different sizes might appear

If you decide to add a fan

Shiplap generally has exposed nail heads whereas t&g does not. BTW, is the tall wall an exposed end wall on the house? If so, it is going to blow in in a high wind. Is there an architect? Someone should review it.

Are cobwebs a problem in your area? Dusting the tiny cobwebs out of tongue and groove on a cathedral ceiling is a real pain. Drywall doesn't host as many spiders.

We are at exactly the same point now and also want to do shiplap. What did you do? Can you post a photo? Your home looks lovely!

Thank you so much. it is beautiful!

Diane, it's amazing. Did you drywall first and do T&G?

Yes- That’s exactly what we did. Thanks!

Where did you buy the light fixture from?

Also if I have 8" shiplap on the walls would you recommend doing 8" on ceiling as well or going smaller 4"???

Currey & Co

Mine are 8 inches wide, and are stained, not painted. I live in a log home, however, which may not be the ambiance you want.

Just for clarity, you ended up installing T&G not traditional shiplap? Looks great, by the way!

Diane: I had this dilemma today. Thank you for this 8" it is.