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Concrete Floor Renovation, Repair and Treatment Specialists

Buffalo: 716-831-7091

Rochester: 585-713-5808

Concrete Floor Repair:

Concrete Crack Repair:

There's an old saying in the concrete business that says, "Every load of concrete comes with cracks." And while that is true of hairline cracks, more severe cracking can be serious and expensive problems if they are not repaired as early as possible.


Hairline (Plastic shrinkage) cracks

Found on most floors and require no attention except for cosmetic purposes. These small hairline cracks generally run parallel to each other and occur during the curing process.

Do the business card test on hairline cracks:


• If you cannot insert a business card into the hairline crack, you're probably okay.


• If you can insert a business card, the crack has the potential for causing or allowing structural damage. Contact us immediately for a complete assessment of your floor's structural integrity.

• If you notice that the hairline cracks are changing in size or shape,contact The MJA Company to prevent more severe damage before it occurs.


Structural cracks and delamination

Structural cracks and delamination can be caused by conditions that include movement, settling, impact, freeze-thaw, improper joints, defects in materials, improper curing, and insufficient floor thickness.

• Structural cracking requires immediate attention to prevent additional damage and the possible need for replacement.

• Structural cracks may cause safety hazards due to uneven surfaces.

• Structural cracking may allow contamination from above the floor to the ground and ground water.

• Structural cracking may allow moisture, chemicals and radon to enter the building from beneath the floor.

• Delamination (the separation of the smooth part of the surface from the underlying fine and coarse aggregate) will, in almost all cases, lead to surface deterioration and compromise the structural integrity of the floor.


Regardless of the type or severity of concrete cracking, The MJA Company is fully equipped to evaluate your floor and offer an accurate estimate for the repairs that are needed to prevent your floor from further damage.



  1. Why does concrete crack? | L&M Construction Chemicals
  2. Delaminations in concrete slabs | George Seegebrecht
  3. Concrete Crack Repair Evaluation | Concrete Network
  4. Cracked Concrete Slabs | Bruce A. Barker



Hairline and Plastic Shrinkage Crack


Concrete Delamination



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