Crown shutting

[PaulWhite]

Hi,

I am still unclear how the crown opening is used. In none of the construction web sites have I seen any reference to this subject. The crown is never a solid piece as far as I can make out.

Does the crown ring stay open all the time? If so, what stops rain coming in and ruining everything inside.

Traditional Yurts with a fire inside obviously don't have stove pipes so they will need to have permanent ventilation, which presumably means the crown "must" stay open.

Possibly in modern yurts using stove pipes away from the centre or underfloor

heating

systems this is not a problem, but how is the problem solved in traditional yurts. Tipis have flaps to control smoke exhaust but I have found nothing on the web covering this subject for yurts.

Info greatly welcomed.

-Paul-