I was taking a good look at what’s currently available on the Net these days for Do-It-Yourself types. I think there are a lot of people that want to find inexpensive containment solutions for their cats. I know that I was willing to pay premium dollars to set up a safe environment for my cat family, but my husband was not, so we got stuck for awhile about how to proceed. I was considering how to invent a cat containment fence topper for our yard and essentially that is what this pdf article has done for us.
Here is a resource that looks very good: http://www.alleycat.org/document.doc?id=100 It provides us with a netting solution for several scenarios and a chicken wire fence. The needed tools and materials are also given:
Installing Net Fence on Existing Chain
Link Fence Under Five Feet
Installing a Chicken Wire Fence
Installing Net on Wooden Privacy Fence
Five Feet or Taller
The added notes and tips suggest that all of these options have been tested out with various types of cats for their effectiveness, with certain things to look out for, monitor and prevent. This Resource is from Alley Cat Allies, a National Feral Cat Resource.