Usually building the roof higher gets rid of those gaps.
The forest roof holes.
Alternatively you could slap a floor down and then run a wall on top of the floor down the middle to fill it and then use vertical logs on the outside to cover that up.
The forest general discussions topic details.
One way i do it is connect one end of roof to wall corner then to the opposite side left or right then back directly.
X princess leliana x.
You build a custom roof and it looks like its floating in the middle with massive holes at either end glad to natives dont throw grenades at you or they could just throw it though the holes.
After this limit is reached you will no longer be able to cut holes even if you haven t finished.
Dec 20 2016 10 32am how to fill in gaps left using custom roofs.