The diagram attached here shows the back yard. The red section is where a lot of 15' - 20' tall bamboo is growing and has been growing for 6 years. The blue color is where the customer is planing to build a patio. Would I be safe if I trench 2' or 3' down right in front of the bamboo line and fill it with cement? It would give me a great base for privacy wall as well. Also, if I dig out about 12" down where the patio will go and fill that with a 6" slab of concrete and then put the pavers on top of the concrete base, will that prevent future bamboo from poking through the patio?