The Living Building Challenge Materials Petal consist of 5 imperatives, all which strive to ensure buildings are made out of non-toxic, ecologically regenerative, transparent, and socially equitable materials.
Imperative 10: The Red List exists to ensure that the building does not contain any harmful ingredients. The Red List is a publicly available list of chemicals and materials which are harmful to either humans or the environment for a variety of reasons. Some of the entries on the Red List have been granted temporary exceptions, because their purpose cannot currently be replicated by other materials. These materials can be used, but under the understanding that they will not be granted exceptions on further products if a less harmful material becomes available for the same purpose.
Imperative 12: Responsible Industry introduces the Living Future's ingredient labeling program called "Declare". The Declare program has been described as "a nutrition-label for products". It offers a clear and easy to understand label for disclosing ingredients which helps to contribute to full transparency of buildings and their impact on the environment. The Declare label streamlines the Materials Petal requirements by essentially pre-approving products.
There are 3 levels of Declare label certification: Declared means that all of the ingredients of the building material have been accounted for; Red List Compliant means the product contains Red List materials that have been given temporary exceptions; and Red List Free means that there are no harmful materials in the product. Living Building Challenge projects must use at a minimum one Declare product for every 500m2 of gross building area.