I have a large yard which will have areas through my yet to exist garden, that will be major walkways. To the deck, to the shed, to the now imaginary chicken house and so forth. I was wondering about laying some thick old carpet down to define those walks and then covering it with straw as a mulch. Has anyone did this? I wonder how long it takes to break down badly enough that weeds start taking over? If it lasted 7 or 8 years I would do it. If it only lasted 3 to 5, I don't know if it would be worth the effort to me. Will it make a difference if I use two layers vs one? or use a particular type of carpet?