October 30, 2026 - PRESSADVANTAGE - Rywen Insulation Inc, a family-owned rodent exclusion and insulation contractor based in San Leandro, California, is drawing attention to a detail that often escapes homeowners attempting to keep rodents out of their homes: the size of the openings involved.

A rat can fit through a gap about the size of a half dollar, and a mouse can pass through one about the size of a quarter.

Because those openings are usually too small to see from the ground, the entry points that allow rodents inside frequently go unnoticed until insulation damage appears.