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subkey: "structure", Key:building:structure, Key:roof:structure
Status: Proposals with undefined or invalid status (inactive)
Proposed by: apapadaki
Tagging: building, roof, building:structure, roof:structure=*
Applies to: Node, Way, Relation
Definition: Structure is defined as “the arrangement of and relations between the parts or elements of something complex”[1]
Drafted on: 2016-03-30


This proposal adds additional values to the "building" key and the "roof" key, introduces the "building:structure" key and the "roof:structure" key with possibility of application to other relative keys such as "bridge:structure" (in proposal stage), "highway:structure", "tunnel:structure" and other forms of physical man made features and infrastructure to offer a more extended description of those elements in a more technical description.

The key building:structure is describing the building technology or main materials used in the making of a certain building. Wikipedia-16px.png Structure

The key roof:structure is describing the two main parts of a roof. Its supporting structure and its outer skin, or uppermost weatherproof layer. Wikipedia-16px.png Roof#Parts


During our project of NGT Zanzibar, we came across with the need to describe in more detail which building technique our buildings were made of in order to stand out certain techniques that are slowly going into extinction and are of historic value and importance. The subkey "structure" could offer to mappers provide more specific and in-depth information about their mapped features and their load-bearing types. Readers could get more technical information and statistics about available or most popular building techniques in an area.



Building:structure key list of NGT values

Key Value Description Photo
building:structure wattle_and_daub Wattle and daub is a composite building material used for making walls, in which a woven lattice of wooden strips called wattle is daubed with a sticky material usually made of some combination of wet soil, clay, sand, animal dung and straw.

Wikipedia-16px.png Wattle and daub

Spiro wattleanddaub HRoe 2005
building:structure concrete_frame_and_cement_blocks Building technique in which concrete counteracted with steel reinforcing bars is forming the building’s structural system, while the filling of walls is made of cement blocks.

Wikipedia-16px.png Reinforced concrete

Photo Courtesy: NSET
building:structure cement_blocks Masonry technique of making mainly one floor buildings with cement blocks and a binding material. Sometimes reinforced with simple concrete rings.

Wikipedia-16px.png Concrete masonry unit

building:structure coralstone_and_lime Masonry technique of making stone structures from a type of limestone called coralstone, a binding lime mortar and lime plaster.

Wikipedia-16px.png Limestone Wikipedia-16px.png Lime (material)

building:structure makeshift "Acting as an interim and temporary measure” [2]

A structure that was made with whatever material was around to meet a certain immediate need.

Roof:structure key list of NGT values

Key Value Description Photo
roof:structure concrete Concrete slab.

Wikipedia-16px.png Concrete slab

roof:structure timber_frame_and_metal_sheets Supporting frame is structured with a framework of a timber roof truss, covered with corrugated iron sheets.

Wikipedia-16px.png Timber roof truss

MountLawleyRooftops gobeirne
roof:structure timber_frame_and_roof_tiles Supporting frame is structured with a framework of a timber roof truss, covered with roof tiles.

Wikipedia-16px.png Roof tiles

roof:structure bushpole_frame_and_makuti Supporting frame structured with bush poles and roofing made of makuti thatching.

Wikipedia-16px.png Makuti thatching Wikipedia-16px.png Thatching

Malindi town view

Applies to

Nodes, ways or areas.
Node, Way or Relation


In general, these proposed values should be mapped in the same way as "building=yes", "roof=yes".

Features/Pages affected

The Key:building and Key:roof pages will be affected. New Key:building:structure and Key:roof:structure pages will need to be created to cover those tags;


Please add comments on the proposal here.


Please comment on the discussion page.