Using IS, you can add Additional Parameters to your schedule. I used a gutter object and added the Additional Parameter of "Gutter Length". Choosing the Sigma option next to the Gutter Length parameter the schedule gives me the total of the lengths of placed gutter objects.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"