LAKE FOREST, Calif., June 2, 2004 -- Wonderware, a business unit of Invensys Systems Inc., today announced that Elk, a leading manufacturer of roofing shingles, has implemented Wonderware's plant intelligence solutions to manage a variety of manufacturing functions ranging from product manufacturing and quality control, to systems safety and maintenance.

A $500 million company with facilities throughout the United States, Elk runs a highly automated facility which operates 24/7 in Shafter, Calif. using Wonderware's InTouch, IndustrialSQL Server and ActiveFactory application. Elk also plans to roll out Wonderware software to its other facilities nationwide.

According to Paul Rogers, systems engineer at Elk's Shafter facility, Wonderware has had a significant impact on overall production efficiencies and product quality control. Positive results have been especially achieved with the use of the IndustrialSQL Server real-time plant historian and its related plant intelligence applications.

"The installation of the IndustrialSQL Server historian has proved to be an invaluable tool to us throughout the organization," Rogers said. "We use it to perform troubleshooting on the factory line, assist with preventive maintenance and identify opportunities for quality and production control improvements."

As a real-time plant historian, IndustrialSQL Server software provides the backbone for Wonderware's plant intelligence solutions. The IndustrialSQL Server historian and associated data analysis tools provide plant decision-makers with immediate access to detailed, real-time plant information, which leads to actionable plant intelligence. The IndustrialSQL Server historian automatically acquires real-time production data at high speeds, at full resolution and from multiple simultaneous data sources, and combines them to provide a complete, real-time picture of a plant's processes.

"With IndustrialSQL Server software, Elk can now collect data from 6,500 points every two seconds and keep more than two years of data which can be accessed at any given time to assess the plant's productivity levels," Rogers said. "With this deep visibility into both current and historical information, subtle process inefficiencies and product quality problems can be identified and corrected immediately."

Elk also uses Wonderware's ActiveFactory, another key component of its plant intelligence solution which maximizes the value of data stored in IndustrialSQL Server. ActiveFactory enables Elk managers and executives to easily access plant and process data. ActiveFactory disseminates information across a network, intranet or the Internet and provides trending data analysis over time, easy numerical data analysis using Microsoft Excel, comprehensive data reporting using Microsoft Word, and ad hoc access to plant floor historical and real-time information.

In addition, Elk is using Wonderware's InTouch HMI software for visualization and industrial process control to manage its manufacturing operations. InTouch enables users to quickly create and deploy customized applications that connect and deliver real-time information. A flexible architecture ensures that an InTouch application will meet current needs and scale to accommodate future requirements, while retaining the initial engineering effort. In addition, InTouch applications can be accessed from mobile devices, thin clients, computer nodes and over the Internet.

About Elk

Elk Corp., through its subsidiaries, manufactures Elk brand premium roofing and building products (over 90 percent of consolidated sales) and provides technologically advanced products and services to other industries. Elk Corp. strives to be the supplier of choice in each of its businesses. Its common stock is listed on the New York Stock Exchange (NYSE:ELK). For more information on Elk and Elk products, visit the company Web site at www.elkcorp.com.

About the Wonderware and ArchestrA Business Units

Wonderware and ArchestrA are business units of Invensys Systems Inc. Wonderware is the world's leading supplier of industrial automation and information software. Founded in 1987, Wonderware pioneered the use of the Microsoft Windows operating system in HMI automation software for manufacturing operation systems. Wonderware software powers intelligent plant decisions in real time. The hallmark of the ArchestrA technology is: "Every system in your plant, working in concert."

Based in Lake Forest, the Wonderware and ArchestrA business units have regional sales and development offices throughout the North American, European, Latin American and Asia-Pacific regions to provide support to its network of more than 160 distributor offices. Wonderware has approximately 300,000 software licenses in approximately 100,000 plants worldwide, which is about 30 percent of the world's 335,000 plants with 20 or more employees. For more information, visit www.wonderware.com or www.archestra.biz.

About Invensys

Invensys is a global automation, controls and process solutions group. Products, services, expertise and ongoing support enable intelligent systems to monitor and control processes in many different environments. The businesses within Invensys help customers in a variety of industries perform with greater efficiency, safety and cost-effectiveness. Industry areas of focus include hydrocarbons, chemicals, oil and gas, power and utilities, rail, telecommunications, paper, food and beverage, dairy, pharmaceuticals and personal care.

Process Systems provides products, services and solutions for the automation and optimization of plant operation in the process industries. Featuring industry-leading brands such as Foxboro, Triconex, SimSci-Esscor, Wonderware and Marcam, Process Systems occupies a top-tier position in the DCS, safety, simulation and HMI markets. Products are installed in more than 100,000 plants worldwide. Serving process and batch industries, including hydrocarbons, chemicals, power and utilities and metals and mining, and also the discrete and hybrid manufacturing sectors, Process Systems is at the forefront of technological innovation, with new award-winning technologies such as ArchestrA, Digital Coriolis and DolPhin.

Also within the Invensys Group, APV specializes in process equipment engineered into systems and asset services for food, beverage, personal care, pharmaceutical and chemical clients. Eurotherm is a leading supplier of control and measurement instrumentation solutions and services to industrial and process customers. Rail Systems is a multinational leader in the design, manufacture, supply, installation, commissioning and maintenance of safety-related rail signaling and control systems. Climate Controls is a major provider of the components, systems and services used globally to make commercial and residential environments safer, more comfortable and more efficient. Appliance Controls has the broadest system and component offering for the appliance industry worldwide.

The Invensys Group has headquarters in the United Kingdom and is listed on the London Stock Exchange. With 39,000 employees operating in 60 countries, Invensys helps customers to improve their performance and profitability, building value for end users and shareholders alike. For more information, visit www.invensys.com.

Note to Editors: Invensys, Wonderware; ArchestrA; FactorySuite; FactorySuite A2 ("A-Squared"); "Every system in your plant, working in concert."; Foxboro; Marcam; Triconex; SimSci-Esscor; Digital Coriolus; DolPhin; APV; and Eurotherm are trademarks or servicemarks of Invensys plc, its subsidiaries and affiliated companies. All other brands and product names may be the trademarks of their respective owners.

Comm Strategies for Wonderware
Kari Garcia, 949-753-9292, Ext. 244
pr@commstrategies.com