Paper Weight - Conversion Chart has a chart showing the weight and thickness of various cardstock used. 110# cardstock mentioned on this forum is usually
index and is 199 gsm. 65# cardstock is
cover and is 177 gsm.
To help prevent warping when laminating people usually let the lamination dry with a heavy weight like hardcover books on top. Some waxed paper helps prevent the part from attaching to the weight if some glue oozes out.