§ 15. Mr. Donnelly
asked the Parliamentary Secretary to the Ministry of Works, as representing the Lord President of the Council, what relative figures the building research station has of heat loss as between solid floors in dwelling houses and traditional wood suspension floors.
§ Mr. Molson
The generally accepted value of the coefficient of heat transmittance through solid floors on the ground is of the order of .15 to .20; that through suspended timber floors is of the order of .35 to .40. This means that heat passes more readily through a suspended timber floor than it does through an 11 inch unventilated cavity brick wall, while it passes less easily through a solid floor on the ground than it does through such a wall.