From sand to pebbles: The best materials for floor heating backfill

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This video documents the backfilling process for floor heating systems in a room. Workers evenly spread pebbles across the floor heating pipes to improve heat transfer efficiency and ensure even heat dissipation from the system. Common backfill materials include sand, pebbles, and cement mortar. Sand is inexpensive and easy to apply, but it has poor thermal conductivity and is prone to settling. Pebbles have good thermal conductivity and are highly stable, making them suitable for efficient floor heating systems. Cement mortar can secure the pipes, but its thermal conductivity is poor and its application is complex. Overall, pebble backfill has become the material of choice for modern floor heating systems due to its excellent thermal efficiency and stability.
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