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Water Removal ...

...a dry crawlspace does not only apply to the aspect of not being able to visually observe standing water, but, it deals more specifically with the amount of water levels within the air space of the crawlspace (humidity) and the subterranean water traveling underneath the home's foundation. 

With regard to wood or paper decay, it typically occurs in the form of mold and bacteria.  Most home's air conditioning systems supply and return ducts are located within the crawlspace.  These ducts are typically not sealed at their connections of assembly.  Specifically, the return ducts are negative in pressure by design and are infiltrating the mold, bacterial and humidity from the crawlspace into your home.  Odd as it may seem, during the summer months, homeowners are paying their local electric utility companies to provide power to operate the cooling aspect of their air conditioners and to extract or reduce the objectionable levels of humidity from within the home.  However, simultaneously in the operation of cooling and dehumidification, the water or high humidity of the crawlspace is being introduced back into the home each and every time that the system operates. 

Case in point; two homes with equal footprints of foundation & equal water impact, however, one home is built with higher exterior foundation walls.  The home with the higher foundation walls will have a lesser volume of water vapor (humidity) per cubic foot; simply due to the increased interior volume in which to dilute the water into.  That being said; it is easy to understand the scenario that a home on a sloped lot will have increased levels of humidity on the end of the house that has the lesser amount of crawlspace elevation.  And normally, the lower end the home will be adjacent to the driveway or garage (since this end of the lot is more nearly flush with the driveway entrance) so as to benefit automobile ingress and egress.  It is this lower end of the home that is at a greater potential risk of failure due to high levels of humidity, simply by its physical design.

From a concept of an interior moat, along the inside of a foundation's perimeter footing, and sloped from a higher elevation to a lower elevation collection point, we install a "sediment free" coarse aggregate fill and sediment fabric with a smooth walled PVC piping system that is mechanically connected throughout its length.  The advantages of a sediment free & large aggregate collection system, as well as, the smooth conveyance piping means that the water will enter the system faster and travel restriction free to its terminal location.  Many contractors use a flexible corrugated drain pipe.  This pipe does not have a defined carrying weir (bottom) and is inundated with friction / resistance corrugations along its interior.  Our pipe is designed with inlet openings along each side, about 1" above the bottom weir, and is mechanically glued ... so as to form a smooth solid bottom conveyance system.  At this terminal location, an electrically powered mechanical sump & pump will be installed to receive the water and to pump it over the foundation footing.

For purposes of cost reduction / profitability, some (most) drainage contractors choose to leave the excavated materials on site and interior of the crawlspace; and to cover the removed materials with plastic.  These soils are bacteria filled and saturated with water and gaseous smells.  With regard to a Molescapes drainage installation, these soils are exported off site as they are excavated.

We provide an underground external discharge conveyance system for the primary water.  This piping is typically terminated at the curb, or possibly in an attempt of cost management, to an acceptable natural bedding location as an alternate location.  Within the design and installation of the discharge piping, and with the premise & possibility of a power failure (where feasible), we install the origin of the drain pipe atop the foundation footing; so as to provide for an "overflow relief" ... much like that similar to a bathtub overflow.


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