Welcome to U.S. Building Supply Thank you for visiting. US Building Supply is your number one wholesaler of quality Alcoa, Certainteed and Crane Performance siding, Traco, Kensington, and Andersen windows. Along with these top brand products, we also offer the best service at competitive pricing. We currently have five facilities to serve you, located in Colorado Springs, Grand Junction, Reno Nevada, and two Denver locations. Please peruse our website to see if we can help you.