Key:building:material - OpenStreetMap Wiki

The key building:material=* is used to describe the outer surface material of building walls, also know as the facade or façade.

This information can be used to model 3D buildings.
Some 3D renderers set the colour of a building based on this tag^[1].

This tag should be used to determine what the external layer of building walls is made of or covered with, and not what the walls are made of.
For example: if the walls of a building are made of bricks, plastered and painted, then the appropriate tag would be building:material=plaster.

Values

Value	Short description	Example image	Count
cement_block	Concrete masonry unit or cement blocks, concrete blocks, breeze blocks (UK), concrete hollow blocks (Philippines)
brick	bricks
plaster	building coated in plaster (or stucco)
wood	wood
concrete	concrete, reinforced concrete
metal	metal
steel	steel, non-decorative metal, often seen on industrial buildings or tanks
stone	stones Similar values: limestone, sandstone
glass	glass
mirror	mirrored-glass
mud	dried mud Similar values: adobe, rammed_earth
masonry	Unspecified masonry - better use brick, cement_block See also building:structure=*
tin	tin
plastic	plastic
timber_framing	A half-timbered building facade. See also Timber framing.
sandstone	sandstone Similar values: limestone, stone
clay	clay Similar values: loam, adobe
reed	reed
loam	loam Similar values: clay, adobe
marble	marble
copper	copper (see Copper in architecture on Wikipedia)
slate	slate
vinyl	plastic vinyl strips
limestone	limestone Similar values: stone, sandstone
tiles	generally ceramic tiles
pebbledash	concrete or plaster covered with small stones (also known as roughcast)
metal_plates	metal plates See also: metal
bamboo	bamboo (see Bamboo construction on Wikipedia)
adobe	indicates adobe, aka cob, wichert, puddled clay, bousille, etc. Similar values: clay, loam
rammed_earth	indicates rammed earth
solar_panels	solar panels
tyres	tyres
user defined	See Taginfo for all common values.

Rendering examples

See also

Possible tagging mistakes

References