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AcoustiCORK RC500 Underlayment

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$1.22 /sqft
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Rubber CorkAcoustiCORK RC500 Underlayment
Product Highlights
  • Designed to be used under ceramic tiles and hardwoods, but can be used under natural stone, wood, LVT, laminate, engineered wood, cork flooring and bamboo.
  • Has been formulated to suppress crack formation in the flooring surface.
  • This underlayment can be directly bonded to the flooring surface with a polyurethane adhesive.

  • Designed to be used under ceramic tiles and hardwoods, but can be used under natural stone, wood, LVT, laminate, engineered wood, cork flooring and bamboo.
  • Has been formulated to suppress crack formation in the flooring surface.
  • This underlayment can be directly bonded to the flooring surface with a polyurethane adhesive.
  • Has been shown to offer the same sound reduction as 5mm rubber underlayment.
  • Mold and Mildew resistant.
  • IIC 50, STC 50.
Description - AcoustiCORK RC500 Rubber/Cork underlayment is the perfect underlayment to use under both ceramic tiles and hardwoods. This underlayment combines the sound proofing qualities of rubber with the improved adhesive properties of the cork granules. What sets this flooring underlayment apart from other cork based underlayments is the fact that the flooring surface can be direct bonded to the underlayment surface. This enables for a quicker and easier installation process. One other quality of this underlayment is its crack suppression qualities. This underlayment helps to suppress substrate cracks from appearing in the flooring surface. This flooring underlayment has also been shown to provide the same sound absorption qualities as 5mm rubber.
Material - AcoustiCORK RC500 is composed of both rubber and cork and consists of 95% recycled material making this a very 'green' product.
Width - 48” wide rolls.
Length - Available in 30’ long rolls.
Thickness - 5mm (~3/16”).
Weight - 88 Lbs. per roll.
Origin - Made in the USA.
Spec Sheet - Printable Spec Sheet.
Recommended Uses - RC500 underlayment is a favorite to use under ceramic tiles and hardwoods, but has been used under natural stone, wood, vinyl, linoleum, laminates, bamboo, luxury vinyl tiles and planks, engineered wood, and cork flooring.
For direct bonded tile installation instructions, please Click Here.

For glued wood floor installation instructions, please Click Here.

For floating floor installation instructions, please Click Here.

For nailed wood floor installation instructions, please Click Here.

Rubber Cork Underlayment

  • Why rubber cork underlayment?

AcoustiCORK RC500 rubber cork underlayment offers superior sound resistance while providing crack suppression with superior comfort. Comprised of recycled materials, this environmentally friendly product provides cushion underfoot as well as reducing sound transmission and impact sound such as footsteps. Rubber cork underlays are great for residential and commercial use.

Do I REALLY need underlay?

  • Yes, most definitely.

Underlayment is an amazing invention created by the flooring gods out of necessity. Underlay has an impressive list of benefits, including: adding warmth to your floors so your feet aren’t so cold on new tile flooring, adding comfort and a slight ‘give’ underneath wood or vinyl floors, reduced sound transmission (great for houses with noisy teenagers!), as well as reducing in room step noise. The image to the left is a very simplified example of using underlayment versus not using it, but as you can see the benefits greatly outweigh any reason not to.

Making your house a home

  • Products that work together

A favorite for use with ceramic tiles and hardwoods, laminates, and natural stone floor tiles. Rubber underlayment should never be used with vinyl flooring, VCT, or linoleum flooring as it could potentially stain these materials.


  • What does it mean?

Underlayment with a thickness of up to 5mm thick are great when it comes to residential or commercial use, with all flooring types. When you get to more than 5mm thick, these are really great for installations where you need to add thickness to match up with an adjoining/existing floor surface.

IIC / STC Ratings

  • What do they mean?

IIC stands for Impact Insulation Class, which refers to impact sounds such as shoes hitting the ground, dropping a cell phone, or other scenarios where something it dropped or impacts the floor. STC stands for Sound Transmission Class, which refers to any audible noise (not an impact) such as music playing aloud, a conversation, or a loud television, for example. With both of these ratings systems, the higher the number rating is for the underlayment, the better it will suppress sound, and the quieter a room will be. You may want to pay close attention to these ratings when shopping for underlayment if sound reduction is important to you.

Don't see what you're looking for? 
How many dB of soundproofing does this ( 5mm) create?
Laura Pollard
AcoustiCORK RC500 Underlayment has been tested in Accredited Laboratories as per ASTM E-90/E-413 (STC) and ASTM E-492/E989 (IIC). AcoustiCORK RC500 Underlayment is given an IIC Rating of 50 & STC Rating of 50
Can the AccoustiCORK RC500 underlayment be used underneath the 8mm Strong Rubber Tiles-Designer Series? I have an unfinished basement room I'm planning to turn into a home gym/theater room—currently a concrete slab. I was thinking of using DriCor subfloor membrane panels over the concrete, then Accousticork over the plywood panels finished off with the 8mm Strong Rubber Tiles. Does this make sense?
You can use AcoustiCORK RC500 Underlayment under our 8mm Strong Rubber Tiles - Designer Series or any of our rubber flooring products.
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Average Rating

  Under laminate flooring
Installed in Home
Grhdrh from West Hollywood wrote...
Ordered samples and decided upon RC500. Glues onto concrete and flooring glued on top. Professional installation, but was easy to install. Love it over the cork only product. Great quality and worked very well in reducing sound and vibration. Would highly recommend.
Anonymous from Hershey, Pa wrote...
Very happy with the underlayment quality. Only issue I had was processing time took nearly 3 weeks, it was over the holiday's so some delay could be expected. However the customer service the two times I dealt with them were very helpful and went out of their way to get answers. Overall very pleased and would buy again.
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