Greenifying as Winter Does Its Worst

December 9, 2008

Keeping walkways safe for customers is a challenge that many businesses face during the winter months, with or without snow.  But can de-icing be Greenified?   Ice on sidewalks, driveways and parking lots creates physical hazardous conditions for people, and legal hazards for business owners.  So what's the best way to de-ice without doing in the environment?
 
Snow and ice removal is best done non-chemically with shovel and plow but, admittedly, the results on sidewalks at least, isn't always adequate to ensure safety. Chemical de-icer and/or a grit like sand is often part of a comprehensive strategy to make getting around to do business a safe prospect.
 
Chemical de-icers work by melting snow and ice and forming a liquid brine. This brine seeps downward to contact paved and over impervious surfaces, spreads outward breaking the bond between ice and cold surfaces, and makes it possible to physically loosen and remove whole sheets of compacted snow and ice. Used in advance of icing conditions this brine can also prevent ice from forming on surfaces.

Salt or chloride based products are staples of the de-icer industry. Rock salt (sodium chloride) is among the best known and widely used products. Salt may be a fairly benign chemical in most environments under limited use. However there is considerable evidence of water problems associated with excess runoff of salt based materials.  Other products on the shelf will have labels saying, "Contains Primary Potassium Chloride & Secondary Urea Sodium Chloride". These are primarily fertilizers repackaged as de-icers. 

Product packaging may claim to be "non salt based" or "environmentally friendly".  It’s best to evaluate that claim by checking the label.  In fact, what we're looking for is an acetate product. CMA is the most widely tested and used de-icer in the acetates category. It is a natural acid that is soluble in water and it has chemical properties similar to vinegar.  Only labels with calcium magnesium acetate, CMA or another acetate based product is really the organic choice.

Always follow label directions when using a de-icing product. However, any de-icer that is mixed with equal parts of sand can help reduce the use of the de-icer and provide grit for added traction. You may want to consider choosing deep tray-type doormats with stiff bristles to allow people entering the building to brush off their shoes and boots before entering the building.

There is another possibility: heating the sidewalk.  This involves adding concrete pads at busy entryways.  Embedded within these insulated pads are flexible pipes for carrying hot water. The water gives up its heat to the concrete and prevents snow and ice from accumulating. But the energy costs and installation outlays of heated sidewalk systems need to also be taken into account. 

Greenifying and de-icing may not seem at first to be the best fit together, but with proper care, you can protect the environment as well as customers, even when winter does its worst. 


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