Wall visibility

[kat_koz]

hi!

These are the roof and some walls. Walls are in the same place cut perpendicularly. I can't make the mid wall attache to the roof in the same way the others do (white gap in the middle). Seems like the wall attach only the bottom of the roof unlike the others... Any ideas how to allign it? 

Kasia

[k.jayavijayan]

Try using  “Join” geometry tool to join the exterior wall with mid wall. This should make the mid wall attach with roof

[kat_koz]

Thank you, I tried but unfortunately it doesn't help