If aluminum general circuit single strand wiring exists keep in mind it has been linked to an increased risk of house fires. The house fires are caused by overheating at connection points.

Further inspection and evaluation by an electrical contractor familiar with aluminum wiring must be conducted prior to expiration of your inspection contingency to determine what upgrades are necessary or desirable. All connections must be checked for signs of damage or overheating. Expect it to be diffcult job that few electrical contractors around "want to do".

The connection points can experience overheating or become loose due to the properties of aluminum wiring. Upon fitting the wiring with special connectors and outlets, the wiring is considered to be safer. Contact the home owners insurance company you intend to use to determine if coverage will be impacted. Please point your browser to http://www.cpsc.gov/CPSCPUB/PUBS/516.pdf for more detailed information!

Even if you as a buyer do not care about the aluminum wiring you can rest assured that the person who buys the home from you when you sell it may very well ask you to pay to cure the hazard.

Aluminum single strand wiring is all Romex type (non-metalic) I have never heard or seen any single BX type wiring.