Project workflow
Separate thermal or sealing design from the material takeoff
Measure the physical coverage or run
Use attic area, duct surface, pipe route, opening perimeter or joint length as the traceable geometry layer.
Enter product-specific coverage
Package yield, roll coverage and linear coverage belong to the selected material, not to a hidden site-wide default.
Keep design decisions external
R-value, thickness, vapor control, joint geometry and compatibility must come from project requirements and product documentation.