What Causes Dark Edges Along Carpeted Walls?

Have you ever seen edges along carpeted walls or stair edges that have become darkened

? This darkening is referred to as Filtration Soiling. It is caused by very fine microscopic particles that are carried along by air movement under your carpets and up through the gaps along the walls, air vents or under doors. The carpets fibers act as a filter grabbing the airborne pollutants and producing the dark edges. This process can occur quickly or over a long period of time and is more easily seen on very light colored carpet but can also be noticed on darker carpets as well.

These airborne particles can consist of many things: dust, air pollution, cigarette smoke, candles, cooking oils and more. In many cases the source of airflow carrying the contaminants is heating and air conditioning forcing air under your carpets and leaking through any gaps in the edges. In order to prevent filtration soiling it is necessary to seal the gaps (or leaks). This can be done by pulling up carpet and caulking the edges with silicone or using a foam insulation to block air flow.

Removing filtration soiling is a time consuming process and sometimes it is not possible to completely remove all of the soiling due to the fact that it can penetrate deep into the backing. When you have your carpets professionally cleaned the technician will generally pretreat spots and spills and can also pretreat the lines along baseboards. Depending on the type of pretreatment used you can usually expect some moderate improvement, however, to make a significant impact a special treatment is often required; followed by manually scrubbing the soiled edges with an agitation device such as a brush. The final step requires heavy flushing of the treated lines so that residue is not left behind. Because of the considerable time involved in treating, agitating and flushing, removing dark edges can sometimes cost a bit more than you may be willing to spend. So, the cost factor as well as the reality that complete removal of filtration is not always possible must be weighed.

Typically, costs for removing filtration soiling can range from.75 to $1.00 a linear foot. If you would like to estimate how much it may cost to have your dark edges treated take a measuring tape a record how many feet along your walls the soiling covers; multiply this number by $1.00 and you will have a good idea what this treatment may cost.

What Causes Dark Edges Along Carpeted Walls?

By: Tony

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