The 1960's and 1970's was an era where aluminum wire was used as an alternative to copper to reduce cost of new construction. Problems associated with the aluminum wiring occur at the point of attachment on a wiring device. Resolution of the problem would be the use of pigtailing with copper conductors and changing existing devices with "COALR" devices.
Houses wired to code no longer use aluminum wire nor is it available for the wiring
Power Utility Companies & Aluminum Wiring
Aluminum conductors are used by Utility Companies as a service drop from the utility pole to structures.
Consumer Product Safety Commission
The only Consumer Product Safety Commission (CPSC) approved methods of upgrading aluminium wired homes are the COPALUM method, which must be done using special products and by electricians certified in its use, or by completely rewiring the home with copper.