Trapped air between glass or mineral wool fibres reduces heat loss by conduction and convection. Walls 35 Cavity wall insulation fills the cavity between the outside walls with mineral wool ...

So, trapped air reduces heat loss by conduction and convection. Many insulating materials incorporate trapped air. There are several different ways to reduce heat loss: ...

The device indicated loss of heat around windows and doors in Miss ... But the thermal images revealed cracks in a wall, which later proved to be signs of subsidence. “That would probably ...