A 2% gap around a square meter of wall insulation can reduce its value by up to 50%. Once air convection gets going within the wall as well as on the outside of it, the transfer of thermal energy really speeds up. I am keen to check my builder is clued up on this.
     

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Teachers, you might like to check out how to teach thermal bridges in Revealing our Thermodynamic Beings.

Chapter Three - A Holey Pilgrimage-Arresting Slumps.

Bonus Joules and the Knowledge Economy: All images on this site are copyright.