Received an article on entry mat selection from the good folks at CleanLink. If I might quote the article:
“Remember the ‘Rule of 15s,’ which dictates that at least 15 feet of matting should be installed at all entry doors — five feet each of coarse scraper, wiper/scraper, and wiper mats. The American Institute of Architects reports that five feet of matting will capture 33 percent of walked-in debris; 10 feet will capture 52 percent; and 20 to 25 feet can capture as much as 100 percent of soil on a person’s shoe bottoms, preventing the soil from entering the facility.”
About all I'd add is on the desirability of rented, TREATED mats for the "wiper mat" function. The laundering that the mat company uses, generally weekly, will get the mat cleaner than anything we, or the client, can do on site, and the treatment (added after the laundering) removes from shoe soles both tiny particles and oil based dirt, generally picked up in the parking lot (think engine oil, tranny fluid, and petroleum distillates from the asphalt). All things that your floors ought avoid.
We can only do so much with vacuuming, mopping and shampooing.
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