Most "solid" glass laminates were laid up with two laminates of 450gm/sqm CSM with extra reinforcing at load points. If it was a "coremat" (either 2mm or 3mm) composite then the CSM was two laminates of 300 gm/sqm, one either side of the core. With lighter weight foam cores then the laminates varies greatly depending on the type of “glass/carbon/Kevlar” to be used.