Entrance matting is specified by length, not by area: the working rule is that foot traffic should take at least six to eight steps across matting before it reaches carpet, which for most people means roughly 4 to 6 metres of matting from the door. Almost every underperforming office entrance in Gauteng fails this one test, usually running a single 1.5m mat inside a door and wondering why the reception carpet greys out annually. Matting is the cheapest carpet protection available to a facilities manager, and it is the one most often specified by budget rather than by function.
Why length is the whole specification
A mat removes soil from a shoe by contact. One step transfers a fraction of what the sole is carrying, the next step transfers a fraction of the remainder, and so on. The relationship is roughly exponential, which is why a short mat is not a partial solution but close to no solution: one or two steps removes a small share of the load, and the shoe walks the rest onto your carpet.
Six to eight steps of contact captures the large majority of what a shoe carries. That is the number to design to. If you take one thing from this article, make it that the correct question at an entrance is not "is there a mat" but "how many steps of mat".
The three zones
Zone 1: outside the door, scraping
An external mat or grid, coarse and aggressive, to knock off the heavy material: mud, stones, sand. This zone is doing bulk removal, and in a Gauteng summer it is also the first defence against a thunderstorm walking through your foyer.
Zone 2: the threshold, scraping and absorbing
Immediately inside the door, a coarse-textured mat that continues scraping while starting to absorb moisture. This is typically where the entire matting budget currently sits, doing a third of the job.
Zone 3: inside, absorbing and polishing
The longest run, and the one nearly everybody omits. A finer, absorbent textile mat that takes the residual fine grit and the remaining moisture off the sole before it reaches carpet. Zone 3 is what actually protects the reception carpet, and it is the zone that gets cut when the quote comes in high.
Getting the details right
Cover the full door width and then some. A mat narrower than the opening simply teaches people to walk around it, and they will. Match the traffic pattern, not the doorway geometry, because if the desk is to the left of the door, the diagonal is the real path and the mat must sit on the diagonal.
Recessed matwells are the best answer where you can get them, usually at design or refit stage. They give you the depth for a proper aggressive mat, they eliminate the trip edge, and they stop the mat migrating. Where a matwell is not an option, use a rubber-backed mat with a bevelled edge that lies flat, and check it monthly, because a curling mat edge in an occupied building is a trip hazard and an incident report waiting to happen. That is an OHS matter, not a housekeeping one.
Never lay a rubber-backed mat over broadloom for a long period. It traps moisture beneath it and can discolour the carpet under the mat.
Maintaining the mats themselves
A saturated mat is not a mat, it is a soil reservoir that redistributes what it collected onto the next shoe. This is the failure nobody notices because a dirty mat looks like a mat doing its job.
Vacuum mats daily, on the same round as the traffic lanes, see the correct way to vacuum. Deep-clean them on the same cycle as the carpet, because they hold more soil per square metre than anything else in the building. And replace them when the pile is crushed flat, since crushed pile has no capacity left and no amount of cleaning restores it.
What matting is worth
Every gram of grit stopped at the door is a gram that never reaches a traffic lane, and grit in a traffic lane is what abrades fibre and drives the replacement date, see why traffic lanes go dark. Matting is not a cleaning cost, it is a capital deferral, and it belongs in the same conversation as the cleaning cycle, see the business case for recurring cleaning.
It also does visible work. The entrance is where clients form their impression of the business, and a clean, flat, well-fitted mat at a clean threshold is doing brand work as well as soil work, see how clean floors affect customer impressions.
The honest limit
Matting reduces soil load substantially. It does not eliminate it, and no matting system removes the need for vacuuming and periodic deep extraction, see the facility manager's maintenance guide. It shifts the curve, it does not flatten it. Anyone selling matting as a replacement for a cleaning programme is overselling it.
Common questions
How long should entrance matting be in an office?
Long enough that foot traffic takes at least six to eight steps on it before reaching carpet, which is roughly 4 to 6 metres from the door for most adults. Soil transfers off a shoe by contact, so each successive step removes a fraction of the remainder. A single 1.5m mat gives one or two steps and captures only a small share of the load.
What are the three matting zones?
Zone 1 sits outside the door and scrapes off heavy mud, sand and stones. Zone 2 sits at the threshold and continues scraping while beginning to absorb moisture. Zone 3 runs inside and is a finer absorbent textile that takes the residual fine grit and moisture off the sole. Zone 3 is the longest run, it is what actually protects the carpet, and it is the one most often omitted.
How often should entrance mats be cleaned?
Vacuum them daily, on the same round as the traffic lanes, and deep-clean them on the same cycle as your carpet. Mats hold more soil per square metre than any other textile in the building, and a saturated mat stops absorbing and starts redistributing soil onto the next shoe. Replace mats once the pile is crushed flat, because crushed pile has no capacity left.
Does entrance matting really reduce cleaning costs?
Yes, and its bigger value is deferring replacement rather than reducing cleaning. Grit that reaches a traffic lane abrades carpet fibre with every footstep, and abrasion is permanent, so it sets the date you recarpet. Matting is the cheapest way to keep that grit out of the lane. It reduces soil load substantially but does not remove the need for vacuuming and periodic deep extraction.
For an assessment of your entrance and a plan for the floor behind it, contact our commercial team or see commercial carpet cleaning.