Insulation of houses

Much detailed work has been done on this topic and a few results are quoted below.


All these figures are for a temperature difference across the surfaces of 20 ^oC. Of course, even perfect insulation is no use at all unless you cut out all the draughts!

U values

It is useful for architects to know the rate of loss of heat per square metre through a material when the difference of temperature across its faces is 1K. Clearly this will also depend on the thickness of the specimen so the values given below can only be regarded as approximate.