As title suggests, rain falls through the roof of buildings in New Asgarth. I don’t know if stopping rain falling through roofs was only for player built housing, but I thought I should report it just in case this isn’t supposed to be happening.
EDIT: For Nordheimer places like Stormwatch, Desertwatch, and Meadowatch, the small houses DO stop rain. So far its only a problem in New Asgarth.
2nd EDIT: Buildings in Mounds of the Dead seem fine, too. So, its just New Asgarth.