Oversite
concrete (often referred to as German floor by the laymen) is a layer of
concrete used to seal the earth under the ground floor of a house.
Before pegging
and digging the foundation of the proposed building. The first thing is to
determine how high the oversite concrete of the house should be raised above
the natural ground level. Note that there will be many different levels on a sloped
land.
It is very
important to check the topography of the area. More important is the level of
the land with respect to the road. If the road is tarred, use it as a reference
for determining how high to fill the land when the building is completed for proper
grading of the yard for surface drainage. But if the road is not tarred, endeavor
to put into consideration how high in the future you think the road will be filled or
excavated during construction and use that as a guide or reference.
Having a
good knowledge of how high the land should be filled to enable water to drain
out completely during and after rain, this will determine the height to raise
your foundation before pouring the oversite concrete. The Foundation must be a
minimum of 300 - 450 mm higher than the anticipated highest point
of filling required for the surroundings of the building. Most people do not
like to raise their foundation because of the extra cost of filling it, but
years later they will regret not doing it.
High oversite
concrete/foundation has a lot of advantages: It helps to prevent flood from getting into the house after heavy rain fall, it
allows the surroundings of the building to be filled higher than the road level
for good draining when it rains, high foundation serves as a barrier to slow
down moisture rising by capillary action and it is more effective if damp proof
membrane (common examples is polyethylene sheet) is used and different landscape
design can be achieved in the future if desired. It also adds value to the property
because future prospective buyers will appreciate owning a house with very low
propensity for floods.
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