About the Wall and Ceiling Bureau
The Wall And Ceiling Bureau (WCB) is a non-profit drywall, lath and plaster technical organization servicing Northern California. WCB is the technical arm of the Wall And Ceiling Alliance (WACA). WCB's primary focus is to provide technical support to union wall and ceiling contracting members.
* Respirable Silica Testing Results (courtesy of Wall and Ceiling Conference): Appendix A