To expand the application of Sentence 9.36.2.8.(1) to the above-ground portion of a foundation wall that is on average less than 600 mm above the adjoining ground level.
To limit the probability that the effective thermal resistance of the above-ground portion of a foundation wall will be unacceptably low, which could lead to excessive thermal transfer through the building envelope, which could lead to excessive use of energy for heating and cooling, which could lead to an unacceptable effect on the environment.