How to Fix a Cracked Concrete Driveway in Adelaide

Intro — Cracks are the most common concrete question we get. Not all cracks mean replacement.

Why concrete driveways crack in Adelaide

• Reactive clay movement (Class H1/H2 northern suburbs)
• Insufficient roadbase or thin pour
• Control joints too far apart or not cut
• Tree root intrusion
• Settlement after poor compaction

Types of cracks — which need repair vs replacement

• Hairline cracks (< 1 mm): cosmetic only; polyurethane filler
• Structural cracks (> 3 mm, displaced edges): replacement section
• Heaving cracks (one side higher): subsoil problem; full replacement

DIY crack filler options — polyurethane vs epoxy vs concrete patch; when each works

When cracks indicate a bigger problem — displacement, heaving, multiple parallel cracks within 300 mm of a joint

The right fix: saw-cut around the damaged section + pour a replacement bay

Prevention after repair — control joints, sealer, tree root management

CTA — Free on-site assessment if you're not sure whether repair or replacement is needed

Internal links: /concrete-driveways-adelaide, /blogs/signs-concrete-driveway-needs-replacing, /blogs/how-thick-should-concrete-driveway-be-australia, /contact