While compressive strength has long been considered the most important quality control characteristic of concrete, where a floor topping is to be installed, permeability may be of equal importance. More details here... http://www.epfloors.com/concrete-moisture-facts/

1. GENERAL CONCRETE
MOISTURE FACTS

2. Capillary Action
Capillary action is often
underestimated and can be very
serious. Moisture can come from a
water table as much as 20 feet
below the ground surface
CONCRETE MOISTURE FACTS

3. Hydrostatic
Pressure
Moving water that is forced
up through the slab by the
weight of water in the soil
surrounding the foundation.
CONCRETE MOISTURE FACTS

4. Hydraulic Pressure
The action of at least two
solid surfaces that act upon
water to force it, under
pressure, in a particular
direction
CONCRETE MOISTURE FACTS

5. Leakage
Water traveling from a higher
to a lower level due to gravity.
May be due to rain, flooding,
sprinkler systems, runoff, poor
landscaping, etc.
CONCRETE MOISTURE FACTS

6. Water Vapor or Vapor
Emissions
These act according to the physical
laws of gasses or chemical
equilibrium. Water travels from one
area to another whenever a
difference of vapor pressure exists.
CONCRETE MOISTURE FACTS

7. SALTS
Moisture present in building
materials always carries soluble
and insoluble salts. The most
common are sodium chloride,
calcium sulfate, calcium carbonate,
and magnesium sulfate.
CONCRETE MOISTURE FACTS

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