Installing a horizontal fence over the existing vertical fence
I would need to know more about the existing condition of your fence. If you could send me a picture that would be great. I would definitely recommend that your existing fence be in very good shape if you were going to add on to it. If it were old and rickety it wouldn't do you a whole lot of good to put new materials on top of it that's for sure. There's a lot of things to consider. Are you a fasteners I.e. your nails or screws coming loose on your fence? Is the wood rotted or warped? All that stuff makes a big difference in what you are asking. Another thing that is very important is your 4x4 post that are in the ground if they are loose I certainly would not add more weight to the fence. I would hope they were set in concrete from the beginning If they weren't I wouldn't even consider doing this.