Meaning
Spatial friction is an operational resistance metric that quantifies the physical impedance encountered by moving personnel and material across a facility. Founders evaluate this resistance on a continuous ordinal scale running from unobstructed flow to severe structural bottlenecking. The quantity measures distance multiplied by obstacle density divided by corridor capacity.
Higher values generate delays in internal logistics and escalate the hourly attention cost expended on moving items between workstations. This metric stops applying at property boundaries where external transport logistics replace internal layout considerations.
Physical Drag
Physical drag arises when workstations sit too far apart or corridors narrow unexpectedly. Operators spend excessive hours walking between assembly tables and storage racks because the layout ignores natural workflow sequences. Every extra meter added to a transit route consumes bodily energy and reduces the daily output of finished units.
Removing a single interior wall often cuts transit time by half and lowers the daily attention cost for floor supervisors.
Spatial Gradient
A spatial gradient measures the cost delta between adjacent zones in a facility. Operations analysts calculate this gradient by comparing the transit time in a well-organized zone against the transit time in a congested zone. When the gradient exceeds standard thresholds, material accumulates at the boundary and creates hidden inventory buffers.
Facility redesigns flatten this gradient by placing dependent workstations adjacent to each other.
Flow Resistance
Flow resistance dictates the maximum speed at which physical tasks execute within a given floor plan. High resistance forces operators to pause their primary tasks to clear pathways or wait for congested equipment to pass. This friction behaves as a tax on physical throughput because every redirection drains attention hours away from quality control.
Low resistance lets material move through the workspace without human intervention beyond the initial placement.