Galvalume is an alloy of aluminium and zinc (45% zinc and 55% aluminium).  Galvalume is a registered trademark. 

Galvalume has high thermal resistance. It is also resistant to corrosion.  Galvalume can also be easily formed.  It has smooth appearance and is preferred for roofing applications in the construction industry. 

Galvalume is a good reflector and can reflect thermal radiation.  This reduces the cooling costs and increases comfort.