King County Library Roof

associated markets
printer friendly version
share this project: Bookmark and Share

King County Library, headquartered in Issaquah, Washington, is one of the busiest libraries in the United States. The library system consists of 48 libraries throughout the area and has a collection of more than 4.1 million items. So, when one of their libraries needed a new coating system to protect its roof, they wanted an efficient solution quickly. They enlisted the help of Tnemec to solve the problem.

“The owners were having a tough time with the existing coating system on many of the library roofs,” said local Tnemec representative, Rick Gilbreath, of TNW, Inc. “We approached them with a strong two-coat system that would likely outlast other systems available.” Library roof coating before photoLibrary roof coating after photo

The project team began the application process by power-washing the substrate to remove contaminants and then scarifying the surface with sandpaper. The team then began spray-applying the primer Series 118 Uni-Bond Mastic at 6-8 mils DFT.

“Rather than blast the roof to bare metal, Series 118 can be applied directly to aged coating systems because of its high-built, elastomeric properties,” explained Gilbreath. “This saved the owner significant time and labor costs.”

Applicators followed the primer with a topcoat of Series 1072 Fluoronar at 2-3 mils DFT. This fluoropolymer finish, Series 1072, offers unprecedented protection against UV light degradation.

More than 2 million people reside in King County, Wash., a northern county which includes the state’s largest city, Seattle. The King County Library System consists of nearly 50 libraries throughout the county and several mobile services, circulating more than 22 million items every year. Aside from typical library services, KCLS also provides residences of King County with a variety of services, including book clubs, interlibrary loans, homework services, museum passes and opportunities to meet authors.

project information

Project Location

Shoreline, Washington

Project Completion Date

October 2016


King County Library, Issaquah, Washington


Weatherholt & Associates, Seattle, Washington


Long Painting Company, Kent, Washington