Can you lay Karndean on top of Karndean?

Can you lay Karndean on top of Karndean? Generally not recommended to lay Karndean on top of Karndean, with Karndean official guidelines requiring removal of old flooring and ensuring subfloor is flat, smooth, and dry before installing new Karndean, as laying over old Karndean can cause adhesion issues, unevenness, and void warranty, though in some cases glue-down over glue-down possible with proper prep but not advised. Karndean flooring requires flat subfloor within 3mm over 3m, with old Karndean being glue-down vinyl with adhesive residue, laying new Karndean over old can cause uneven surface, telegraphing of old seams, and adhesive failure as new adhesive may not bond to old vinyl, plus height issues with doors. Karndean official installation instructions say remove existing flooring, prepare subfloor with self-leveling compound if needed, and install new Karndean on clean subfloor. Some installers may lay Karndean Korlok click floating over old Karndean if old is well bonded and flat, as floating floor does not need glue, but still not ideal as old floor must be perfectly flat and stable, and height increases. So can you lay Karndean on top of Karndean? Not recommended, should remove old Karndean, prepare subfloor, and install new, with removal costing 1 to 2 dollars per square foot, ensuring proper installation and warranty, with glue-down over glue-down not recommended due to adhesion failure risk, making removal best practice for Karndean over Karndean.