For each element, only the materials that make up a significant majority of the building element (up to 80%) need to be responsibly sourced. Any material which comprise the remaining 20% can be included at the discretion of the assessor if it contributes to achieving more points. It should be noted that including additional elements from a lower tier level may reduce the number of points scored.
Criterion 2.b To achieve points for any given building elements, at least 80% of the materials that make-up that element must be responsibly sourced i.e. classified in tier 1-7.