Self-leveling or non-sag?

Self-leveling for horizontal surfaces (driveways, sidewalks). Non-sag for vertical surfaces (walls, foundations). Using the wrong type will result in poor results.

How wide a crack can I fill?

Up to 1 inch wide. Wider joints need backer rod and may require flexible sealant rather than crack filler.

Concrete Caulk

Adhesives & Sealants

Sealants

Budget: $4-$7 (latex concrete crack filler) | Mid-range: $7-$12 (polyurethane self-leveling) | Premium: $12-$20 (commercial grade polyurethane)

Concrete Caulk: Crack Filler & Joint Sealant for Driveways & Foundations (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 25, 2026|Sources & methodology

Concrete caulk is a flexible sealant formulated specifically for filling cracks and sealing joints in concrete driveways, sidewalks, patios, and foundations. Available in self-leveling (for horizontal surfaces) and non-sag (for vertical cracks) formulas, it remains flexible to accommodate concrete movement through freeze-thaw cycles.

Key Features

Self-leveling formula for horizontal joints; Non-sag formula for vertical cracks; Flexible through freeze-thaw cycles; Gray color matches concrete; Polyurethane and latex formulas

Specifications

Types: self-leveling polyurethane

non-sag polyurethane

latex | Colors: gray

limestone | Tube: 10.1 oz cartridge | Width: fills up to 1" wide | Depth: 1/2" maximum (use backer rod for deeper) | Cure: 24-48 hours

Applications

Driveway expansion joint sealing; Sidewalk crack repair; Foundation crack sealing; Patio and pool deck joints; Garage floor crack filling

Installation Overview

Clean crack or joint of debris with wire brush or pressure washer. Insert foam backer rod for joints deeper than 1/2 inch. Apply self-leveling formula to horizontal joints or non-sag to vertical cracks. Tool smooth if desired. Allow 24-48 hours to cure.

Pros & Cons

Pros

✓ Flexible through freeze-thaw; Self-leveling fills horizontal joints perfectly; Matches concrete gray color; Prevents water intrusion into cracks

Cons

✗ Surface preparation is important; Large cracks require backer rod; Self-leveling cannot be used on slopes; May need periodic reapplication

Top Brands

Sikaflex

DAP

Quikrete

Code Requirements

Not a structural repair - significant foundation cracks may indicate structural issues requiring engineering evaluation. Expansion joints must maintain ability to expand and contract.

Buying Tips

Always use self-leveling formula for flat surfaces - it creates a smooth, level fill; Use foam backer rod for any joint deeper than 1/2 inch; Sikaflex is the professional standard for concrete joint sealing