What is a hairline crack?

A hairline fracture, also known as a stress fracture, is a small crack or severe bruise within a bone. This injury is most common in athletes, especially athletes of sports that involve running and jumping. People with osteoporosis can also develop hairline fractures.

What is considered a hairline crack?

A.: ACI 116R-90, Cement and Concrete Terminology, defines hairline cracks as cracks in an exposed concrete surface having widths so small as to be barely perceptible.

Is hairline crack serious?

Generally, smaller hairline cracks are not cause for concern. These are usually the result of seasonal expansion and contraction of clay soils beneath your house over time, and can be easily patched and re-painted.

Do hairline cracks heal?

Treatment. The majority of hairline fractures will heal by themselves if the person refrains from activities that put a strain on the affected area. For the first 24 to 48 hours, a person can help the healing process by elevating the affected area and applying ice where possible.

What size is a hairline crack?

Size of cracks



0 – Hairline cracks: Less than 0.1 mm in width. No repair action required. 1 – Fine cracks: Up to 1 mm in width. Generally restricted to internal wall finishes.

Are hairline cracks in teeth normal?

Craze lines are hairline cracks in teeth. They don’t usually progress into deep cracks and are considered cosmetic in nature. However, they may lead to cavities in teeth if proper dental hygiene isn’t done. If you’re troubled by the appearance of craze lines, at-home whitening or in-office dental procedures may help.

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How can you tell if a crack is structural?

Telltale signs of structural cracks in your foundation are:

  1. Stair-step cracks.
  2. Cracks on foundation slabs or beams.
  3. Vertical cracks that are wide at the bottom or top.
  4. Cracks measuring 1/8″ in width.

Can hairline cracks in concrete be repaired?

You can repair hairline cracks in concrete with a grout made of Portland cement and water. … After the hairline crack has been moistened and thoroughly cleaned, apply the grout with a putty knife or pointing trowel. Force the grout into the crack as much as possible.

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