When Yao Jianming first studied the aisles of a Menards store, he wasn’t there to shop. He was there to learn—row by row, label by label, testing standard by testing standard. The American home improvement giant, with its 300-plus locations across the Midwest, represented the gold standard for any overseas supplier hoping to make it in the U.S. market. But for Yao, the path to a partnership wasn’t about cutting deals in a conference room. It was about proving that his company’s windows could survive a Texas hurricane, keep a Minnesota home warm in January, and do both while earning the industry’s most rigorous certifications.
Today, the Chinese founder and general manager of Anhui Weika Windows & Doors Co., Ltd. presides over a quiet revolution in the U.S. fenestration industry. Through his American subsidiaries—P Pro Windows LLC in Texas and Legend Materials Supply Inc in the Midwest—Yao has transformed Weika from a regional Chinese manufacturer into a full-fledged American supplier. With $30 million in annual North American sales and a strategic supply agreement with Menards, he is proving that a foreign-made window, when engineered to meet—and in some cases exceed—U.S. standards, can compete head-to-head with domestic brands.
From Factory Floor to U.S. Soil
Yao’s journey into the American market began with a sobering realization. In the early 2010s, most Chinese window manufacturers focused on low-cost, low-spec exports to developing markets. The U.S., with its labyrinth of building codes, energy standards, and liability laws, seemed out of reach. But Yao, who holds eight invention patents and more than 40 other patents in his home country, saw an opportunity.
“I realized that the U.S. market doesn’t need cheap windows,” Yao said in a recent telephone interview. “It needs windows that solve real problems—hurricane resistance in the Gulf Coast, energy efficiency in the Northeast, and water management everywhere. If we could build a window that met all three, we would have a product that American builders and homeowners would actually want.”
The first step was certification—a grueling multi-year process that separates serious global suppliers from also-rans. Yao’s team submitted Weika’s flagship Performax line to independent, third-party laboratories for AAMA (American Architectural Manufacturers Association) testing. The AAMA certification, one of the most trusted seals in the industry, measures a window’s ability to resist air and water infiltration, withstand structural pressure, and maintain energy efficiency over time. For Yao, passing the AAMA’s air-water-structural tests was just the beginning. He also pursued the NFRC (National Fenestration Rating Council) label—the official certification body for the EPA’s ENERGY STAR program—to verify his products’ U-factor (heat loss) and Solar Heat Gain Coefficient (SHGC) performance.
“The AAMA water penetration test is extremely demanding,” Yao explained. “The laboratory sprays the window with water while subjecting it to high-pressure wind speeds. If there is a single leak, you fail. Our Performax line not only passed but exceeded the ASTM E331 standard for water resistance.”
Climate-Specific Engineering
What sets Yao’s windows apart, according to his own engineering philosophy, is a data-driven approach to climate adaptation. Rather than offering a one-size-fits-all product, Yao’s team developed a library of glass and frame configurations calibrated to specific U.S. climate zones. For a project in Dallas, where summer solar heat is the primary concern, the Performax system deploys triple-pane, double Low-E coated glass with argon gas fill, driving the SHGC as low as 0.25—well below ENERGY STAR’s Southern zone requirement. For a Minneapolis high-rise, where retaining heat is critical, the same window system achieves a U-factor of 0.28, surpassing the Northern zone threshold.
“Most overseas manufacturers don’t bother with this level of granularity,” Yao noted. “They build one window and hope it works everywhere. I spent two years developing a software tool—my ‘Intelligent Drainage Design and Calibration Software’—that actually simulates fluid dynamics to optimize drainage channels for each climate. That is engineering, not assembly.”
The software, one of Yao’s patented innovations, automatically generates optimal drainage schemes based on local rainfall intensity and wind pressure data. The result, according to Weika’s internal testing, is an 80 percent reduction in water infiltration complaints and a 30 percent improvement in installation efficiency.
The Menards Milestone
With AAMA and NFRC certifications in hand, Yao turned his attention to distribution. Unlike many overseas suppliers who settle for third-party logistics or small independent dealers, Yao set his sights on a strategic alliance with Menards, the Midwest’s largest home improvement retailer. The company’s purchasing standards are famously exacting, covering everything from packaging and labeling to delivery windows and warranty support.
“Menards doesn’t just test the product,” Yao recalled. “They test the entire supply chain. We had to rebuild our packaging system, implement full traceability from factory to store, and train a dedicated English-speaking customer service team. It took 18 months.”
The investment paid off. In early 2024, Weika’s Performax line began appearing on Menards shelves across the Midwest. Today, the company maintains a dedicated inventory of more than 100,000 units for Menards alone, with replenishment cycles synchronized to point-of-sale data. For U.S. homeowners and contractors, the result is a premium window, engineered in China but stocked locally, available for immediate pickup at a competitive price point.
Building an American Presence
Yao’s commitment to the U.S. market goes beyond export sales. At the end of 2024, he acquired P Pro Windows LLC in Houston, Texas, a full-service distribution and assembly center serving the Gulf Coast region. Additionally, he launched Legend Materials Supply Inc in the Midwest, creating a dual-hub logistics network that can deliver products to Menards stores and independent dealers within 48 hours. The two subsidiaries, which together employ more than a dozen U.S. workers, mark a deliberate shift from “shipping to America” to “operating in America.”
“Having a physical presence here changes the conversation with builders,” Yao explained. “When there is a quality question, we can respond immediately. When a contractor needs a custom size for a tricky renovation, we can have it fabricated in two weeks. That is the level of service American customers expect.”
Shifting the Market
Yao’s success is having a ripple effect across the fenestration industry. Established U.S. manufacturers, long accustomed to competing primarily on brand heritage and distribution reach, are now facing a new kind of rival: a foreign company that has mastered the technical standards, invested heavily in U.S.-based logistics, and is willing to engineer products for specific American microclimates.
“The old model was to build a window that could pass a test in a lab,” Yao said. “We build windows that perform in the real world—on a Houston jobsite in August or a Minneapolis roof in February. That is a higher bar, and it is forcing everyone to raise their game.”
For Yao, the next frontier is even more ambitious. He is currently developing a window system with a U-factor below 0.8—a thermal performance threshold that would surpass the most stringent ENERGY STAR requirements by more than 30 percent. If successful, the product could open the door to passive house and net-zero energy projects across the U.S.
“We are not here to compete on price,” Yao concluded. “We are here to compete on performance. The American market has always rewarded innovation, and we intend to be part of that tradition.”
（By Michael Reynolds, Business Correspondent）