Simpson has been making doors for America's finest homes since 1912 in the forestlands of the Pacific Northwest. That's nearly 100 years built on product innovation and generations of employees that are passionate about what they do.
Simpson UltraBlock Technology In addition to leading the industry in wood door design and craftsmanship, Simpson is committed to superior performance in all its products. To help protect exterior doors from the worst Mother Nature can dish out, Simpson has offered UltraBlock technology as a Performance Series® upgrade for several years. What does UltraBlock technology mean for you? It means you are selling a time-tested high-performance exterior wood door solution, all backed by a 5-year warranty. UltraBlock makes what you are selling different than the competition and gives your customer an answer that others can't match.