Building Definition Language

The Building Envelope shall represent the coordinated systems separating conditioned, occupied, protected, or controlled spaces from exterior or differently conditioned environments.

The Envelope Model shall include:

walls;

roofs;

floors over exterior or ground;

foundations;

windows;

doors;

joints;

penetrations;

façade Cartridges;

insulation;

air-control layers;

vapor-control layers;

water-control layers;

thermal bridges;

fire and acoustic layers.

Each envelope Assembly shall define its ordered layers:

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Each layer shall identify:

material;

thickness;

continuity;

function;

environmental exposure;

attachment;

joints;

penetrations;

inspection requirements.

The Envelope Model shall represent continuity across:

wall-to-foundation joints;

wall-to-roof joints;

corners;

openings;

Interfaces;

Nodes;

Cartridge perimeters;

utility penetrations.

Performance requirements may include:

thermal resistance;

air leakage;

water resistance;

vapor behavior;

condensation control;

fire resistance;

acoustics;

durability.

Envelope performance shall be evaluated in the assembled condition rather than from isolated material properties alone.