Crack Control Collars

Sanders Crack Control CollarRe-entrant corners in concrete slabs are highly susceptible to developing unsightly cracks. The Sanders Companies has a solution to minimize, or even eliminate, these concerns.


What are re-entrant corner cracks?

A re-entrant corner is anywhere within a slab foundation where a fixed object forms an angle of less than 180 degrees into the body of the slab. A common example of this is at inside corners of a building’s foundation. Other locations where unsightly cracks can occur are the corners of interior load supporting walls or columns. These two crack locations often develop during the initial curing stage shortly after the slab has been poured. Concrete, though extremely effective in compression, is not capable of handling moment-driven tension loads and will develop cracking where the highest concentration of tension loading occurs. Whether it is normal drying shrinkage, slab movement or non-uniform loading, tension stresses develop and cracking follows. Even in the most pristine building conditions, tension stresses cannot be completely eliminated.

BEFORE: Concrete Slab with Typical Re-Entrant Corner Cracking

BEFORE: Concrete Slab with Typical Re-Entrant Corner Cracking

AFTER: Concrete Slab with Installed Crack Control Collar

AFTER: Concrete Slab with Installed Crack Control Collar

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This pour was done several weeks ago on a Slab On Metal Decking. The Crack Control Collar was used around the stairwell cut corner and no cracks have appeared.

How can The Sanders Companies’ Crack Control Collar help?

By using the Crack Control Collar commercial builders and contractors can rest assured knowing the cracking caused by tension stresses will be minimized, if not completely eliminated. This patented, recycled product works by isolating the areas where high-tension stresses develop. The pre-formed curvature ultimately eliminates the slab’s re-entrant angle, thus eliminating the location where cracking would typically begin. By isolating the corner, the slab is allowed to move normally outside the high-tension zone, and the chances of cracking are vastly reduced if not eliminated.

The Sanders Companies wants to partner with you.

Unfortunately, concrete cracks have become standard in our industry. Imagine never having to answer a question from a customer again about why their concrete is cracking. The Sanders Companies looks forward to working with you and providing a product that leaves your customers with a better slab and an improved peace of mind.

“Gradison Design Build has been using the crack control collars from Sanders the last 6 months and have had great success with our basement slabs. The separation of the slab at the outside corners really helps reduce the radiating cracks that never seem to stay in the control joints that we tool in. We have used another method in the past, but these collars have performed better for us in the field. We plan on continuing to use this system from Sanders. ”

Mark Gradison
Gradison Design/Build

Call us at 317-769-5503 or email gcook@sanderscompanies.com today to learn more!

Sanders Companies

Sanders Companies