San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
How To Identify Rat Feces And Where Is It Found?
Dark Brown In Color:
You can recognize the look of rat droppings for their dark brown color. Unlike other animals that have darker feces, rats have a darker brown that does not border upon black.
The Shape:
The shape is often spindle and tapered to be less conspicuous. Most rats have a spindle shape for their feces and the pieces will be no larger than a grain of rice.
The Volume:
Each rat can produce up to 40 droppings in a single evening and this can mean that you are likely to find a series of piles across your home especially if you are facing a larger rat population. As you continue to identify the look of rat feces across your home, you are going to notice piles and likely find rats nearby.
Keep An Eye Out For Rub Marks:
Rub marks are another common sign that you have rats in your home. Rats naturally have grease or dirt on their body and because of their poor eyesight they often leave a series of smudges across your home. The darker marks show areas where the rats are regularly moving throughout your home and potentially entering into areas like the walls. If you started to notice various areas where there could be marks and feces, this offers an excellent chance that you could have a rat inside your home.
Be Careful While Cleaning:
Rats carry a series of diseases and it's very important that you are able to clean up any feces that you find to prevent the chance that a family pet will get into it or that you could be exposed to potential diseases.
