percent voids

percentage void

The percentage of superficial area which is lost by holes, perforations, or cores.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
(This is basically a storage layer made up of an aggregate with 30 to 40 percent voids).
The SFAM plug, using AC 20 as the binder, had a 4.6 percent asphalt content, 4 percent voids, and stabilities over 3000 lb.