How To Mix Self Leveling Underlayment

By Todd Fratzel on Flooring

Today’s guest blog post comes from Fred and Ethan over at One Project Closer. Fred and Ethan have just made a great instructional video on how to properly mix self leveling underlayment that I thought you’d enjoy seeing.

We just finished the second area of a radiant heated floor in the basement of our home. This required pouring self leveling underlayment over the radiant heating elements to achieve a level surface for tiling. I searched all over the web for information on the right consistency to mix a self leveling underlayment so it would spread and set properly. I found very little on it. If you didn’t already know, SLUs can cost as much as $30/bag. A large area can take many bags. As a result, a bad mix could cost hundreds and require extensive rework to fix.

That’s why Ethan and I created a video on how to mix self leveling underlayments to the right consistency. If you’re considering using a self-leveling underlayment, but are intimidated about “getting it right,” don’t worry. Its actually very easy. Your project will likely turn out just fine. Check out the original post, How To Mix Self Leveling Underlayment.

Todd, thanks again for letting me share this video on your site. I very much enjoy reading your articles and participating in the home improvement blogosophere. Keep up the good work!

About the author

Todd Fratzel

I'm full time builder for a large construction company in New Hampshire. I run their design-build division that specializes in custom homes, commercial design-build projects and sub-divisions. I'm also a licensed civil and structural engineer with extensive experience in civil and structural design and home construction. My hope is that I can share my experience in the home construction, home improvement and home renovation profession with other builders and home owners. I'm also the Editor-in-Chief and Founder of Tool Box Buzz. Please feel free to contact me if you have any questions, suggestions or you'd like to inquire about advertising on this site.

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  1. Joe says:

    Hi Todd-

    My concrete basement floor needs a layer of self-leveling mortar before I can put down an engineered wood floor. The concrete has a mildly tacky, black adhesive on it from the previous flooring. My question is: What are your suggested methods for prepping a basement concrete floor in order to ensure that the self-leveler will bond properly to the concrete?

    Thank you,


    P.S. Great site–refer to it quite often!

    • Todd says:

      Joe – Honestly I’m not sure. You need to remove the adhesive. I would actually ask a local flooring supplier for some advice. It’s likely that there is a commercially available product for removing adhesive that might work well.

      Instead of a self leveler can you use a wood sub-floor instead? Just a thought.

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