According to industry experts, you need a minimum of 18 to 20 feet of walk-off matting to effectively eliminate tracked-in dirt. Alan S. Bigger is Director of Building Services at a Major American University and an expert in the custodial field. He estimates that an investment in effective walk-off matting will be returned to you 110 fold in decreased maintenance costs.

Most architects will incorporate a mat or grid at a building's entrance to stop dirt and water, but if it's less than 18 feet, their efforts can come up a little short. And if the entrance flooring doesn't provide for thorough dirt removal, the building's maintenance staff may use ugly throw down mats whenever there's bad weather.

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