Karndean over underlay?

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Hello, I'm planning to lay Karndean Korlok in my flat. I've removed my old engineered wood floor. Underneath that I have a 6mm black rubber Tredaire underlay for acoustic insulation. Do I have to remove it before laying the Karndean? Their instructions say their flooring needs no underlay, but should be laid on a solid floor. My Karndean samples feel pretty solid on top of it, and removing it feels like a waste.

Thanks!
 
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Speak to Karndean, but any deformation/movement will snap the Korlok joints.
 
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Will lead to problems If any movement under planks. Is it a soild underlay ?
 
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It's a fairly dense, firm rubber foam, and it's been pressed down by engineered wood flooring for a few years.
 
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most vinyl click flooring has to have a thin underlay. You can’t have it compress. Wood flooring is thicker so that is ok to compress a bit.
 

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