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Tips for Pulling Cores

March 17, 2023

The Dur-A-Flex Core Analysis Program examines core samples for their content of ionic components and moisture, the leading cause of floor failures. Based on the findings of this process, Dur-A-Flex can then make a recommendation as to the best flooring options. Here are a few tips for pulling cores!

1) How many cores do I need to submit for evaluation?

The rule of thumb is one core for every 1,500 square feet. For smaller areas (under 5,000 SF) the ideal sampling will include four corners and one in the center. Please consult the Dur-A-Flex Tech Department for specific applications.

2) What size core sample should I take?

Core samples should be a minimum of 1 1/2″ diameter x 2″ long. Also, number the cores with a Sharpie marker (or equivalent) and note their locations on the survey form accordingly.

3) What do you recommend for coring?

There are a variety of tools available for coring including coring machines, hammer drills, and grinders. These tools can be sourced through your local professional tool supplier.

We recommend using a cordless angle grinder from RYOBI or Dewault and a Dry Core Bit from Cost Cutting Blades with the following Bit Size specifications:

  • Diameter: 1-1/2”
  • Arbor Size: 5/8-11
  • Wet/Dry: Dry
  • Max Depth: 10”

For more information review our Core Analysis Program.

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