For more than 20 years, Polygon Northwest has been building homes that endure our wild La Niña rains, Thanksgiving windstorms, and unforeseen winter blizzards. Our exclusive foundation-to-roof Weather-tight Checklist covers all five critical 'weather mitigation' construction stages—roofing, papering and flashing, insulating, siding and exterior finishing. The framing stage alone covers a rigorous 765-point inspection of everything from the HVAC system to diverter flashings on the gutters to make sure that when you come in, the weather stays out.