Old house and foundations vents help

We live in an older home and just recently had a leak and the crawlspace now
Stinks due to the kitchen sink pipe bursting. That's in another thread below.

My question here is since my son and I have been working under the house I've always wanted to keep the crickets, spiders, mice and possibly snakes from getting under there. Well now that I'm in a working mood I want to cover those foundation vents.

I can't for the life of me find a picture of what ours look like to show you. All I can say is they are not square. They look oval shaped, as if they were made into the
foundation. They are in sets of threes spaced out all around the house and have nocovers or screening whatsoever. No way to close or open anything,it's just oval
shaped holes in sets of three. I want to put some type of mesh screening over
those vent holes. I'll have to do this the cheap way as I am limited on funds.

I've seen the screening I would like to use :

Shop New York Wire 8" x 100' Aluminum Vent Mesh at Lowes.com

Whether or not this is right or not I don't know, but it seems it will do the trick for what I am wanting to do. Im sure it'll keep out the snakes at least, I get paranoid a lot.

So, if I decide to use this how do I get it to stay in place? It'll need to be held into place against a flat concrete foundation. I strongly prefer something easy, and do not want to use concrete nails. is there some type of putty/caulking I can use to
smear around the holes from inside the crawlspace and then press this screening into place, and maybe it'll
harden as it dries holding the screen in place.

 

If you think you really must you some kind of mess screen then I would use wire. Perhaps even the wire from the mesh itself. I wouldn't use real small mesh either. Also if your vents are far enough off of the ground I doubt a snake will be able to get in at least not through the vents.