De-coupling Mat? What is there purpose please?

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A decoupling membrane is used to eliminate lateral movement.
I use a decoupler when tiling onto heated screeds to allow the tiles to move independently to the screed so as to avoid expansion cracks.
If tiling onto timber substrates I would use 6mm cement boards as they act as a decoupler but also enable a more suitable and sustainable substrate.
 

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De-coupling Mat? What is there purpose please?
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Specialist Tile -Stone, Porcelain, Glass
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The Famous Forry,
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Hobnob,
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The Famous Forry,
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Hobnob,
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