NCC 2016 Volume One
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Section J Energy Efficiency
If a Class 5, 6, 7, 8 or 9 building, or part of a building—
is constructed in climate zone 4 or 5; and
has a roof pitch of not more than 5 degrees; and
has a conditioned space,
the roofing material must have an upper surface solar absorptance value of not more than 0.4.