A hollow sound is noted on the parts of marble flooring when tapped with screw driver head or metal coin, indicating the void inside stone slab.
Cause
- Unfilled void inside stone flooring.
- Stone flooring detached from bed mortar.
- Improper surface preparation before laying.
- Excess thickness of bed mortar.
- Sagging or damage on under floor.
Impact
- Cracks on stone flooring.
- Detaching of stone flooring.
- Increase the chances of water seepage inside flooring bed mortar.
- Weathering action & moisture intrusion inside flooring.