group 5

water	-reduce the use of water consumption by reuse of water - use of treated water for construction which may avoid waste of water
Steel	-          Reuse of steel membrane once it is disassembled. -          Bamboo has high tensile strength which can be used in small steel membrane.
Tiles	-use of durable tiles , reducing frequent maintenance and replace and repair - can be recycled and produce new tiles
formwork	-to reduce the amount of use of timber steel is used so that they can be reused number of times reducing cost.
Timber	-use of rapidly renewable tree for the purpose of timber will reduce the use of extincted species of trees and help eco system