M-D Building Products Gray Foam Caulk Backer Rod 1”x10’

Name: M-D Building Products Gray Foam Caulk Backer Rod 1”x10’
SKU: 5670146
Availability: InStock

$7.84

SKU: 5670146 Categories: Building Materials, Insulation & Weatherization

In stock

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The M-D Building Products Gray Foam Caulk Backer Rod 1”x10’ is an essential product for achieving professional, long-lasting results when filling large cracks and joints. This 1-inch diameter closed-cell foam rod is designed to be inserted into deep gaps before caulking. Its primary function is to provide a firm, non-adhering backing, which prevents costly caulk waste by reducing the required sealant depth. It also helps the caulk cure correctly, ensuring the sealant only adheres to the sides of the joint, which is vital for long-term flexibility and crack prevention in both indoor and outdoor applications.

Key Features of M-D Building Products Gray Foam Caulk Backer Rod

1 inch diameter is ideal for filling deep or very large gaps and openings

Closed-cell foam is non-absorbent, preventing moisture from affecting the sealant

Reduces caulk consumption by minimizing the depth of the joint before sealing

Provides a firm base for the caulk, ensuring proper two-point adhesion for maximum flexibility

Can be used indoors or outdoors for expansion joints, door frames, and foundation cracks

Also acts as an insulator, reducing drafts, dust, and insect entry

Compressible foam is easy to cut and press into joints of varying sizes

Gray color blends discreetly with concrete, stone, and general masonry

Additional Information

Brand: M-D Building Products

Product Type: Caulk Backer Rod

Model:

Product Use: Filling Large Gaps Before Caulking

Size:

Material: Closed-Cell Foam

Height:

Length: 10 feet

Width: 1 inch (diameter)

When selecting a backer rod, always choose a diameter that is approximately 25 percent larger than the width of the gap you intend to fill.16 This 1 inch rod, for example, is best for joints around 3/4 inch wide. This compression ensures the rod stays snugly in place without adhesive and provides the firm base needed for proper caulk tooling.17 Use a dull, blunt tool, like the handle of a utility knife, to push the foam into the joint without puncturing it.