You have to leave the walls to prevent the roof fall.
Rimworld take down roof.
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Leave some walls from the edge and take away it gently so that the colonist is not filled up.
Structures leave ash on the ground when burnt.
You can only give it to fall.
In some places you can not remove the thick roof.
Enclosed areas will automatically prompt colonists to build a roof unless you apply a no roof region or if the structure is too large over 300 cells.
Designating such an area will also remove existing thin roofs and thin rock roofs when applied but thick rock roofs will remain intact.
Rock roof mod is a simple mod just to patch core.
Colonists will be able to remove overhead mountain.
And it is not a thick stone roof either.
I used the no roof zone and made sure that my worker where in the right area and not busy but it was impossible to get them to remove the roof i had to use a mod to make the workers remove it.