Entry Mats: Interior or Exterior?

10 feet total, exterior place matts should have some sort of cover/protection from the elements but don't need completely enclosed. So you can have 5 feet inside, and 5 feet outside.

Victor, what specifically was incorrect / not allowed? Most projects use matts on the inteiror only, but I've had a few feet worth on the exterior when it's completely covered/protected.

It seems from the conversation above that it is feasible to split up the 10' length requirement between interior and exterior applications. Would it therefore be sufficient to combine a 6' permanently installed walk off matt in vestibules with a 6' roll up matt adjacent to the vestibule? Or, does the 10' need to be one continuous system??

I concur with Mara and Todd's assessment. I did a project a few years ago and asked this same question regarding splitting inside/outside for 10-ft. The response was that the exterior portion had to be protected from the elements. I presume this would be more than a canopy overhead but some sort of side wall protection to deter leaves and dust etc., from accumulating on the exterior portion.

I just got comment from GBCI that the entryway must be located inside the building. Please see CIR 10098 below: Inquiry Where there are physical impediments to locating 10 ft of walk-off mats inside the building, is it acceptable to locate a portion of the mat or grate outside and then the remainder of the required 10 ft inside? Ruling The intent for the entryway system (grilles, grates, walk-off mats) is to capture dirt and dust. An exception to the 10 ft length and/or indoor location is acceptable provided your alternative solution meets this intent and is thoroughly justified. Applicable Internationally.