what aggregate size for rodentcontrol buffer at food processing plant?

[Gr8WhiteNorth]

I've been told 2 totally opposing stories for material choice as a buffer between grassed areas and the outer building perimeter.

1- 3/4" or down crushed rock - use this because the rodents can't harbour in fine aggregates as they could in between larger 3" rock

2- 3" or greater - use this because rodents (mice) don't like to cross the larger gap size


So what do you guys think is the superior rodent buffer material choice?

[AGLA]

anything from bird shot to buck shot works for me.

I'm skeptical that any aggregate will stop rodents from crossing it.

[Kate Butler]

It won't stop them from crossing it, but it will stop them from burrowing under or through it. I prefer mid-size StayMat for the sharp edges and the good compaction.