M-d 19101 Gray Foam Caulk Backer Rod, 3/4 In. X 180 In.

The M-D 19101 Gray Foam Caulk Backer Rod is a weather-resistant foam filler designed to prepare gaps and joints before caulking. This 180-inch backer rod creates a firm backing that helps caulk achieve proper depth, adhesion, and durability in sealing applications. Whether you're filling expansion joints in driveways and sidewalks, repairing concrete gaps, sealing window frames, or addressing cracks in exterior surfaces, this foam rod provides the foundation needed for professional-quality caulk bonds.

Without proper backing support, caulk cannot seal gaps effectively. This closed-cell foam rod compresses to fit irregular gap widths, sits firmly in place without adhesive, and prevents caulk from sagging into deep openings. The result is a more durable seal that prevents water infiltration, drafts, and dust from entering joints and cracks.

Features and Benefits

• Closed-Cell Foam Construction: Durable material made from weather-resistant foam that stands up to the elements and outdoor conditions.
• Proper Joint Depth Support: Provides a firm backing that lets caulk seal tightly and resist movement, supporting effective adhesion for caulking applications.
• Compressible Design: Flexes to fit irregular and varying gap widths; easily trimmed with scissors for custom sizing without special tools.
• Non-Adhesive Installation: Simply press the rod into the gap opening until snug—no messy sealants, adhesives, or preparation required; easily repositionable during setup.
• Versatile Applications: Ideal for expansion joints in concrete, driveway and sidewalk cracks, window and door frames, roof seams, and any medium-width gap requiring a solid caulking base.
• Cushioning Effect: Foam construction adds thermal protection to exterior seams while providing a sturdy base for caulk application.

Specifications

• Brand: M-D Building Products
• Model: 19101
• Diameter: 3/4 inch
• Length: 180 inches (15 feet)
• Color: Gray
• Material: Closed-cell foam
• Adhesive Backing: None
• Weather-Resistant: Yes