In this directory we follow—with some slight modification—the definition of Environmentally Preferable Products given in the US Green Building Council’s LEED for Homes programme. As this programme changes (and particularly as the Canada Green Building Council develops its own version), the criteria here may also be expected to change.

Acceptable categories of lumber include:

1. timber from Forestry Stewardship Council approved sources in Saskatchewan or neighbouring provinces/territories, as recorded in the definitive list on the FSC Canada website
2. timber from from small woodlots within Saskatchewan which:
   1. do not practice clear-cutting,
   2. do not use unacceptable pesticides (pesticides which are banned by international agreement, OR are persistent, OR are toxic, OR whose derivatives remain biologically active and accumulate in the food chain beyond their intended use),
   3. respect longterm tenure and use rights in the forest, including those of indigenous people.
3. reclaimed lumber
4. lumber substitutes fabricated from recycled plastic
5. lumber substitutes from organic fibrous material
6. in the case of siding, sheathing and trim, timber-based products with a high recycled content.