I'd recommend providing him with stim toys that allow him to get the same sensory input he's getting from chewing on and taring up household items, but without doing damage to the house. Chew toys and/or chewlry from stimtastic, chewigem, or ark therapeutic should help with his need to chew, but for the peeling/tearing fixation you might need to make some sort of homemade sensory book using thin wood slabs or thick, dense cardboard with different types of paper attached to them with whatever's used to attach wallpaper to walls. When he starts to stim in a destructive manner (ie: peeling wallpaper and/or chewing household items) just redirect him to his stim toys.

Echolalia and repetitive language are both good ways for Autistics to begin learning to speak, but giving him access to another form of communication (ie: sign language, a communication app/device, a communication book, etc) might also help reduce unwanted behaviors and speed up language development.

Thank you we are about to spend a lot of money to put up walls he can't peel and I'm looking for the right kind of velcro online. He is not as bad with most of these behaviors during the school year but summer time is killing us. Can't wait for August!

I would use the Velcro because you do not want to simulate the same thing you are having an issue with. At that point you are reinforcing the bad behavior and it will be confusing to him.

Other than watching him like a hawk you need to find an alternative such as the Velcro, and or redirect when he tries to do this. This is the same sort of thing they do for self injurious children. You give them a pillow or something soft to bang their head on I stared if the floor or a wall. They still do the same thing however they do it differently if you understand what I mean. Eventually they generally phase out of this behavior but it is tough when it is going on.

Thank you, he does have chewelry which he has always refused to use until recently he has picked it up a few times and started to chew it on his own. I had not thought of making him a board to peel but I did get a recommendation from a friend a little while ago about putting him a velcro board or wall together for him to tear the strips off of. He will peel or tear anything so I will try a couple of these things and see if he takes to any of them. In the mean time I think we are going to start replacing the walls he has destroyed with solid paneling so there is nothing to peel.