Bytte noen fliser på stua og terasse

Hei, some of my tiles in the living room and the terrasse are cracked and need to be changed (or fixed). Under the tiles in the living room, there is varmeklabler. i hope we can change the tiles with keeping the varmeklabler. Those tiles are 12 years old, i hope we can still find the same on the market. About 15 tiles to change.