A simple mass law based procedure developed by Sharp for the sound transmission loss (STL) prediction of an isotropic double wall is extended to the case of a double-leaf corrugated panel construction. Relative expressions are adopted for the STL estimation for a construction consisting of a layer of fiber reinforced corrugated roof panel and a layer of profiled steel sheet with sound absorption infilled inside the cavity between the two face panels. The STLs of some single and double-leaf corrugated panel constructions are measured in the laboratory to investigate into the sound transmission mechanism and to identify the important effects on the sound insulation performance of the constructions. Based on these experimental results, possible design modifications are presented for improving the sound reduction of double-leaf corrugated panel constructions.