Originally posted by haut/bas:

Ok, back to square one. It was a simple aesthetic and visual tricks.

Originally posted by Ghevd:

45 degree roof pieces hidden inside the chimney. One a few blocks higher than the other and staggered placement.

Should be enough room for smoke to vent and enough cover to block the rain.

Chimney will have to be wider than what is seen in video since that's a furnace.

I'll give a try to this, on paper it's a good idea. Hope it work.

Thank you all.

Edit: It was raining when I start the game, and yeah, the 45° rooftop work well.
Now I have to modify all of my chimney

https://steamcommunity.com/sharedfiles/filedetails/?id=2936339242
https://steamcommunity.com/sharedfiles/filedetails/?id=2936339255

This one works too but it's weird :P
https://steamcommunity.com/sharedfiles/filedetails/?id=2936339306

Smoke doesn't need to vent if there is enough space for it to dissipate, and those fireplaces are at least close to having enough space, so you could probably cap them with whatever you wanted.

My standard large fireplace is two hearths next to each other with somewhere around 3-high 2x4 stone walls surrounding it, with stone floor blocks to cap it off. That completely seals it so no bats can get in, yet provides enough space above for the smoke to dissipate.

It looks like your first two fireplaces are similar, but 1 block shorter, which might still be enough.