Half-storey knee walls: air, insulation and ventilation
One-and-a-half/two-and-a-half-storey homes have several small attic zones where air leaks and insulation discontinuities are easy to miss.
Decision triage
VERT / GREEN · JAUNE / YELLOW · ROUGE / RED
What the professional checks
The professional checks the enclosure plane, knee walls, joists below walls, roof slope, air/vapour control, small-attic ventilation and moisture signs.
Official sources
Sources checked: 2026-08-24
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
Systems to check before closing the work
V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.
Remaining system checks not to miss
V15 covers issues that can block a project, cause a loss or become expensive once concealed.
Edge systems to integrate into the project
V19 covers interfaces that become important when multiple home systems interact.
Often-overlooked service interfaces
V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.
Project risks and overlooked interfaces
V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.
Finish and service details to verify
V28 connects small details that become costly once finishes are closed.
Household safety and compliance details
V29 connects smaller risks that often fall between finishes, appliances, plumbing and local code.
Commissioning and everyday safety
V31 helps verify systems after work and document the values that make a home safer to operate.
Post-disaster and legacy systems
V32 connects contamination, storm damage, legacy materials and recommissioning before rebuilding.