‘High’ and ‘Low Points’
Summary
‘High’ and ‘Low Points’ - ‘High point’ and ‘low point’ are general terms used to describe ‘peaks and troughs’ on the surface of a concrete floor.
Technical Information
No floor is 100% flat, so the existence of high and low points is inevitable. Whether they are problematic or not depends on the difference in elevation between the high and low points and the frequency with which they occur. The larger and more frequent they are, the less likely a floor is to meet its flatness specification.
There are a variety of different reasons for the existence of problematic high and low points in concrete floors, including:
- Uneven placement of the concrete.
- Careless screeding.
- Careless floating.
- Surface defects, such as blistering.
- Fresh concrete having too low a slump.
If it has been found that a completed floor doesn’t meet the desired flatness specification, it is possible to remove high points by grinding, reducing the differences in elevation across the floor’s surface.
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