Concrete leveling is the process of using concrete grinders to reduce the size of humps (high spots) in concrete slabs and a levelling compound to fill in the low areas. This is done primarily to prepare the slab for laying floor coverings with minimal tolerances.
Floating, direct stick and parquetry timber floors generally have a tolerance of 3mm over 3m.
Anything outside this tolerance will need leveling to ensure a successful installation, otherwise your timber flooring will have a bouncing effect when laid over high spots and a hollow sound when laid over low spots in existing concrete.
New concrete slabs are laid to Australian standards which specify 10mm maximum tolerance within any room and 20mm maximum tolerance over entire building footprint. Many new developments have slabs poured to carpet spec. The acceptable tolerance for carpet installation is between 8 – 12mm over 3m.
This is not suitable for timber, vinyl and larger porcelain tile installation and leveling will need to take place before they can be laid.
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