willow tree roots

[Mary Jo]

We have a willow tree that is close to our house. The roots are going straight for the basement walls. If I cut some of the roots what will happen to the trees?

[Kneejerk Bombas]

How far is the tree from the house?
What is the diameter of the tree at about chest height?

[Mary Jo]

Tree is about 17 feet from house.
Tree trunk at chest height is about 1 foot in diameter

[Kneejerk Bombas]

A common rule of thumb is not to cut roots closer than 5 times the trunk diameter. If you stay at least five feet away, are careful to do clean cuts, and the tree is healthy to start, you should be ok provided you don't take too many roots.
It's best if you can dig the soil away and cut the larger roots with a saw.
Willows thrive on water and you'll be taking away the tree's ability to get as much water by cutting roots, so water the tree once a week or so for a while after cutting.
I'm not real worried because willows are vigorous trees and this is a young tree which can withstand heavy abuse. But again water will be key. If it looks like it's having trouble after you cut the roots, or anytime for that matter, give it water.
Willows love wet soil, but it's also good to let the soil dry out between waterings.

I forgot to ask, why are you cutting roots? (your answer will probably change my advice now )

[Newt*]

Mary Jo, I'm wondering what type of willow you have. Do you know the name of your willow?

Newt

[Frimsley]

Why bother? Roots won't damage a basement wall. Not unless the wall is so shot anyway that you need to rebuild it. They are far more likely to be deflected along it.

If you cut the roots, they will regrow. Chill out, open a beer and stop worrying about it.