This is the time of year commensal rodent (mice) exclusion becomes a priority. Here is a view of a crawl space vent, taken at a residential home around Boston today (11-7-2013).
When viewed from a normal standing position it looks like there are no rodent entry points.
When viewed from below, best done using a mirror, such as a mechanics mirror with a handle, you can see the huge gap along the top of the vent. Notice the brown rodent rub mark on the cement edge just to the left of the metal frame of the crawl vent.
Rub marks are left on surfaces when rodents run them repeatedly and the grease and dirt from the fur of the rodent leaves a stain on the surface they run over.
Standard exlusion materials are a supply of copper or stainless steel wool and snips to cut it. Don't use standard steel wool, since moisture will cause it to rust and stain. Also black polyurethane is useful to go over the copper and seal out airflow points that rodents will sniff out.
This is the mirror view or view from below with the copper in place.
This is the mirror view with the black polyurethane over the copper.
-Lauren Greenhow, General Manager, GreenHow, Inc.
GreenHow.com. Effective Organic and Low Impact Solutions, Lawn Care, Pest Control and Termite Control in Newton and Metro Boston.
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