I have 2 cedar trees that have roots approx 3" in diameter that are located close to the top of the basement (concrete foundation) of my house. The diameter of the trees are about 24" at the base and are growing approx 10' from my house. I would like to cut the root closest to the house to keep it away from the foundation. Thoughts, please?
Sorry, but the only solution here is to fell the trees.
If you have 3" diameter roots that you can see at ground level, you have no idea what is going on 5 or 10 feet below ground level, unless you do a huge amount of digging.
And if you do cut off all the roots on one side of the tree, think what might happen the next time you have a severe wind storm. You made the tree more likely to blow down, and it will most likely fall in the direction where there are no roots - i.e onto your house, not into your yard.