Adding a 3rd floor to existing house

[Allen Brown]

Your explanatiohn is a little bit vague, but I'll try. If you have the existing house drawn, and want to add a third floor, just go the the "add new floor" tool, and do not select "move highest floor's roof up". This will create the third floor under the existing roof. If you want to remove some of the roof planes to build the third floor, you will have to move over to doing manual roofs.

Other than that, I will need a more detailed/specific question, as to the issue you're having.

[lbuttery]

try placing roof holes where needed after building floor 3

use manual roof planes for the new roof

Lew