Eco Tec's Sky Field House: The first vaulted ceiling using PET bottles.
All Eco-tec projects have a strong social focus. Most of the PET bottles used are recovered in clean-up campaigns and recycling drives. The community then fills them with sand. They train the unemployed and handicapped in their construction methods. They build water tanks, schools, community centers, urban benches as well as homes. Andreas Froese, Eco-Tec's inventor hopes to also build some PET homes in Haiti utilizing construction debris. Most of the PET bottles used are recovered in clean-up campaigns and recycling drives. www.eco-tecnologia.com

An Eco-Tec home in Bolivia. PET bottle bottoms on the left. 
Wine bottle bottoms on the right.

Eco-Tec's Ecoparque El Zamorano, Honduras.
Ecological House: Constructed with 8,000 bottles with composting toilets and a solar water heating system. The green roof can weigh 30 tons when wet and has been supported by the walls without any extra reinforcement. It is the first house in the world made from PET bottles without using cement in the walls.