Tag:building=roof
 building = roof
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| Description |
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| A building open on at least two sides. |
| Group: Buildings |
| Used on these elements |
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| See also |
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building:part=roof |
| Wikidata |
 Search Wikidata
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| Status: in use |
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| Tools for this tag |
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building=roof is used for buildings which are open at least at two sides. For roof features which are part of another building use building:part=roof.
How to map
A building=roof is considered an open-wall building spanning a ground-level and the roof. A way below the roof should be mapped like ways going through any other building:
- The way and building=roof do not need a distinct layer (unless required for other reasons).
- The way should have shared
nodes with the building where it crosses the outline of the building. - The way should be tagged with covered=*. When the two walls of the building=roof form a tunnel without an open side use tunnel=building_passage instead.
Other features on the ground below the roof should be mapped like if they were in any other building. If there are already other features below or above the building=roof on the map, layer=* should be used to provide information about orientation of features. In addition covered=* may be used to mark objects (for example roads) as covered by roof.
Some mappers prefer to map building=roof + layer=1 and not sharing any nodes with ways passing below the roof - please discuss.
Consider Simple Indoor Tagging or Simple 3D buildings for more complicated cases.
Alternatives
- building=* + wall=no is in use for buildings without (some) walls
- man_made=canopy is in use for canopy like roofs
- building=carport is proposed in Proposed features/carport buildings
Examples
This tag is for instance used for the roofs of petrol stations (amenity=fuel).
See also
Usage in Sweden
This is a minor import but: This tag was recently used in an import in Sweden;
It was used to denote, among other things, buildings that have two walls or less. This means can mean e.g. a front porch. So when it was surveyed the buildings had two or less walls, but it's noted that new walls can later be added by the owners and the data can not be 100% on what the current state is. 
206338356 (XML, iD, JOSM, Potlatch2, history)
