We have a very large Maple approx 10ft from our house. We are wanting to put in a patio but to do so we will need to cut some roots and place down a root barrier. I don't want to hurt the tree and was wondering if it's ok to cut approx. 4 roots? The cut would be approx 6ft from the tree and the width of the biggest root is 1 3/4". The diameter of the tree is approx 7ft. If anyone could offer advice it would be much appreciated. Thanks.