Section 34 of 102
33. Levels and Elevations
Stable section ID: S05-CON-007-SECTION-34 · 50 content blocks
A Level is a named horizontal or otherwise defined vertical reference associated with building organization, structure, space, or construction.
Every Level shall define:
Level ID;
name;
elevation;
elevation datum;
parent coordinate system;
level purpose;
vertical extent;
configuration status.
Level purposes may include:
structural level;
finished-floor level;
top-of-slab level;
ceiling reference;
roof reference;
foundation level;
service level;
manufacturing datum.
Example:
level Level_01 {
id: "s05:level:01";
elevation: 0 mm;
datum: @Building_Vertical_Datum;
purpose: finished_floor;
}
level Level_02 {
elevation: 2700 mm;
relative_to: @Level_01;
}
A Story may contain several Level references and shall not be treated as identical to one elevation plane.
BDL shall support the declaration of:
floor-to-floor height;
clear architectural height;
structural depth;
ceiling zone;
service zone;
Functional Active Zone.
A project Profile may declare:
parameter functional_active_zone_height: 2100 mm;
parameter preferred_clear_height: 2400 mm;
require @OccupiedSpace.clear_height >= 2200 mm;
prefer @OccupiedSpace.clear_height >= @preferred_clear_height;
These values shall remain Profile- or project-controlled rather than universal BDL syntax.
As-Built elevation shall be recorded separately from nominal elevation:
elevation {
nominal: 2700 mm;
measured: 2696 mm;
evidence: @Survey_Record_014;
}