Here's an example of a building product manufacturer going an extra step to make their products greener:

Tremco Commercial Sealants & Waterproofing’s Toronto, Ontario facility has achieved a major milestone: zero landfill. The facility reached its goal through a reduction of waste, recycling of waste and reuse as fuel feedstock. The facility is being monitored for the next 12 months to ensure there is no waste going to landfill. Initiated in 2008, this is part of a five-year project designed to eliminate Tremco’s landfill waste in its North American Sealant and Waterproofing facilities. In the program’s first year, the organization reduced its ratio of landfill waste to materials shipped by 40 percent. (March 31, 2011)

The press release goes on to describe other green initiatives the firm is undertaking.