Raleigh, NC and Surrounding areas

19 days ago

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1 min read

Slab and Driveway Cracks: Normal or a Red Flag?

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When walking through your new construction home, seeing some cracks in the concrete slab is completely normal. Here’s what you need to know:

Why Cracks Happen

  • Shrinkage as concrete cures – concrete naturally loses moisture and slightly shrinks.
  • Temperature changes – expansion and contraction from heat or cold can cause minor cracking.
  • Settlement – slight soil movement under the slab.
  • Normal wear & tear – foot traffic, heavy loads, or minor movements.

Poured in Sections (Control Joints)

  • Concrete slabs are poured in sections with intentional joints, called control joints, to direct where cracks occur.
  • These joints act as “stress relief” points,” so cracks will typically stop at the joint rather than running freely across the entire slab.
  • This is a planned, industry-standard technique to minimize random cracking and protect structural integrity.

Characteristics of a Normal Crack

  • Hairline width (less than 1/8 inch)
  • Appears randomly but generally stops at control joints
  • Doesn’t grow significantly over time
  • Doesn’t affect the slab’s structural performance
  • Place a quarter in the crack.
  • If the crack is wide enough to fit a quarter (~1/4 inch), that’s larger than normal shrinkage and should be evaluated for potential settlement or structural issues.

Pro Tip: Most hairline cracks are cosmetic and can be filled with caulk or epoxy. Cracks that fail the quarter test? Definitely raise concern.

Cracks in a slab or driveway can be scary, and it’s normal to wonder what’s actually a problem. That’s why having a knowledgeable agent like myself on your side matters. The builder’s onsite rep works for the builder, but I work for you. I am here to spot potential issues, explain what’s normal, and guide you through every walkthrough. Think of it as your extra layer of protection so you can buy with confidence and peace of mind

Kala Dunn | Realtor

A Raleigh native and true Triangle insider, I bring seven years of exclusive new construction experience to the table. I have guided buyers through communities, contracts, and design selections with clarity and confidence, interpreting builder processes and contracts into proactive guidance that protects your interests and maximizes opportunity. I understand what adds value, what to avoid, and how to position you to make confident, well-informed decisions. Today, I combine my builder-side expertise with a full market perspective to give my clients an advantage at every stage, from lot selection to closing day. Because I understand how builders operate behind the scenes, I can anticipate challenges before they arise and uncover opportunities others might overlook. The result is a building experience that feels seamless, intentional, and genuinely exciting. Outside of real estate, I have a deep love for design and the details that turn houses into homes. In my free time, you can find me working on a DIY project, discovering a new restaurant, enjoying a brown sugar iced latte, attending concerts, or planning my next trip. Whether you are relocating, building new, or purchasing your first home, I am here to guide you every step of the way with experience, insight, and intention.

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