The primary difference lies in installation efficiency, wind warranty performance, and manufacturing technology. The older Timberline HD (discontinued in 2020) featured a standard nailing area. The upgraded Timberline HDZ introduces revolutionary LayerLock technology, featuring an industry-leading wide nailing zone that makes it significantly easier and faster for roofers to hit the correct fastening target, thereby unlocking an exclusive wind warranty with no maximum wind speed limit when installed correctly.
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