Living · 6 pages · 12 min
How insulation works in a wall
Still air trapped in the material slows heat on its way through the wall.
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From the opening
Insulation slows the movement of heat through a wall, a roof, or a floor rather than stopping it outright. It does this mostly by holding air still, because still air conducts poorly and moving air would carry heat with it. The opening covers still air as the slow path, what wet or crushed fill does, and heat that bypasses through studs.
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Inside
- Still air as the slow path
- What wet or crushed fill does
- Heat that bypasses through studs
- Why thickness is the point
- Where the idea stops applying
- A distinction worth keeping
Sources
- Conductive resistance of still air in insulation
- Thermal bridging around cavity insulation