Planning glossary
Assembly
A defined combination of layers, components, and rules that turns geometry into a building element or quantity recipe.
Example
A wall assembly may identify framing, sheathing, insulation, interior board, finish, and the formulas used for each.
Related concepts
Sheathing
Panels or boards attached to framing as part of a wall, floor, or roof assembly, with structural and enclosure roles depending on design.
Read definitionR-value
A measure of thermal resistance under stated conditions; a product label is not the same as whole-assembly performance.
Read definitionTakeoff
A traceable list of measured and counted project quantities tied to geometry and assembly assumptions.
Read definitionUse the term in context
Definition boundaryThis planning definition is not a substitute for the definition in an adopted code, standard, contract, manufacturer instruction, or professional document. Confirm the controlling meaning for the project.