SPAX 400-Count 1-3/4-in Galvanized/Uncoated Anti-Turn Washer

PLASTI-GRIP CI Prong Insulation Washers are the ultimate fastening solution for securing rigid insulation to a variety of substrates, including masonry, foundation walls, wood, and steel. Featuring a 1-¾” diameter tapered plastic washer, they deliver superior holding power while minimizing insulation facer damage with a flexible perimeter design. Designed for energy efficiency and labor savings, these washers reduce thermal bridging and air infiltration, making them an ideal choice for foundation walls, basements, garages, crawl spaces, attics, and both interior and exterior walls and ceilings. The pre-spotting prongs enable quick and easy on-the-wall fastening, eliminating the need for fastener pre-assembly and streamlining installation. Compatible with screws, nails, and Tapcons, we recommend using SPAX #8 or #10 construction screws with a minimum ¼” diameter head for optimal performance. Whether you're a contractor or DIYer, these washers make securing rigid foam insulation and mineral wool faster and more reliable. Key Benefits: * Fast, Secure Installation – No pre-assembly required, reducing labor time. * Superior Holding Power – 1-¾” tapered washer ensures a firm grip. * Flexible Perimeter – Minimizes tearing of insulation facer. * Energy Efficient – Reduces thermal bridging and air infiltration. * Versatile Compatibility – Works with nails, screws, and Tapcons. * Multi-Substrate Use – Ideal for wood, steel, masonry, and foundation walls. Shoot it, screw it, or nail it—PLASTI-GRIP CI Prong Insulation Washers provide a durable, high-performance fastening solution for rigid insulation attachment in residential, commercial, and industrial applications.