Older Roof Stock and the Multi-Layer Problem
Walnut Grove was built out across the 1960s, 1970s, and 1980s, and many homes still have their existing roof deck beneath one or two layers of roofing. When a Walnut Grove roof needs replacing, the tear-off scope is usually larger than what the homeowner expects because all overlay layers come off and the original deck has to be inspected before new underlayment goes down. Tear offs are essential for thoroughly inspecting the roof deck and ensuring compliance with local building codes. While Washington State Building Code allows a maximum of two roofing layers on a residential roof, we generally recommend a full tear-off rather than an overlay, even when a second layer is permitted, to ensure long-term durability and proper installation.














