A house should really have a roof! Unless you fancy rain...
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–Game Description
Roof are structures forming an upper covering on buildings in Welcome to Bloxburg. They can be purchased in Build Mode. The price for all roofs are based on the size of a 1x1 tile in Build Mode, which will increase in price depending on the amount of tiles the roof takes up in Build Mode. Roofs as of the Version 0.8.5, players can adjust the overhang, pitch and height of roofs. Players can also place items on roofs, which can allow for roofs to be used as flooring most of the time.
While a player is under a roof if it is raining, the rain audio will become muffled, and there will be no visible rain particles under the roof.
All roofs, excluding Flat Roof and Flat Glass Roof, can only be spawned if all of the walls equal to a 90 degree angle. (Meaning, the roof is perfectly straight.)
Added in v0.8.5, players can include heights, pitch, and overhang interacted with, as well as the ability to place a variety of assets on the roof's surface.
Also if you have the Multiple Floors gamepass flooring can act like a roof.