I have a 5 year old gunite in-gound pool that is about 25 ft from a large cypress tree. Well, if you've seen pictures of the swamps in Louisiana you know how these roots like to grow up out of the ground. The tree roots are now encroaching on the pool deck (concrete) and cracking it. I'm afraid the pool is next and that would be big bucks to fix.
I have talked to an arborist who suggested trenching 2 ft down, then installing a root barrier. Has anyone ever done this or had it done? It's not cheap, but less than taking down the tree.
I don't think the cracking concrete is so much caused by the tree roots themselves as by the huge amount of moisture they are pulling from the ground, causing the deck to settle and crack. I have two very large cypress (app. 36 inches dia) located within 3 feet of a concrete drive and don't have any cracking problems, but several sections of the drive between expansion joints have settled a couple of inches.
I'm glad I don't have to keep your pool clean with cypress trees 25 feet away...they are beautiful trees, but pretty messy .
Don't know of any actual success/failures with root barriers, only the sales claims.