Concrete – the best way to fill a 3 inch gap under the concrete front porch

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I'm in need of some help with my concrete foundation. As I was leaving the house this morning I discovered two or three skunks crawling into a gap under my porch. The hole is on the bottom of the porch where the grass and porch meet. The gap is about 42"L x 3 1/4"W. What's the best way to fill this gap?

Also, what would be the best way to get all the animals out of there? I wouldn't want them to get stuck under there if I pour concrete; that would not be good news at all.

Best Answer

I'll assume that the hole is there because concrete was put onto unrammed gravel. The current state is left on the picture

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Now assuming you've got rid of the animals you have to stabilize the existing concrete and the gravel beneath it. The easiest way would be to excavate some of the gravel until you reach some stable foundation (I'd guess it's around one foot deep) and put new concrete forming an extra "step". That will be the easiest way to force the new concrete under the old concrete.

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