We have a redo/renovation project coming up that has me wondering if I've done enough to address the issues surrounding the project. It is a courtyard which has four large palm trees that are planted in 6' rings near the edges of the patio. The patio has been in for the last 4 years and in the areas near the palm rings the patio as sunk close to 6" or more in places. I plan to come in and excavate the entire area to accommodate for 8" of base material under the new pavers. Is that enough? Or should we overdig the area around the palms deeper than the 8"?