Building Definition Language

A Spatial Boundary defines the limit between two Spaces or between a Space and an external or unassigned environment.

Boundary Types may include:

wall;

floor;

ceiling;

roof;

façade;

door;

window;

opening;

virtual division;

site boundary;

fire barrier;

environmental-control layer.

Each Boundary shall define:

Boundary ID;

adjacent Space on each side;

geometry;

orientation;

physical or virtual status;

host assembly;

openings;

performance requirements;

applicable evidence.

Example:

spatial_boundary Kitchen_Exterior_Wall {

side_a: @Kitchen;

side_b: @Exterior_Environment;

geometry: surface(@Wall_W01.inner_reference_face);

host: @Wall_W01;

requirements {

thermal_resistance: minimum 4.0 m2*K/W;

air_barrier: continuous;

water_control: exterior_drained;

}

}

Boundary orientation shall identify which side is interior, exterior, upstream, downstream, positive, or negative where required.

A physical wall and the spatial boundary derived from it shall remain separate Entities. One wall may support several boundary functions, and a virtual boundary may exist without a physical wall.

Boundary continuity shall be validated across:

corners;

joints;

Interfaces;

penetrations;

openings;

Cartridge edges;

structural Nodes.

Changes to a Boundary shall trigger evaluation of adjacent Space properties, fire zones, thermal zones, ventilation, acoustics, moisture control, and access.