Thanks for notice but can't find the typo there is no such tag - https://taginfo.openstreetmap.org/keys/buiding

Height is overall height but building:height height of building only.

OSM is worldwide project so would like to avoid local brand names. Not all dolls are Barbies.
More correct name of roof material would be Asbestos cement sheet or fibrolite roof.

I read this - osm.wiki/Simple_3D_Buildings

Seems eternit roof would be more accurate but such brand is not known locally - roof:material=*