I Was told to use Copper sulfate to STOP large roots from advancing around Foundation

[RTAW]

I have a maple VERY close to the house, This tree WAS hanging OVER my home, and I managed to have it trimmed all the way back. The other half is hanging the other way. I felt good for a while. Then people began telling me the root structure of these trees is VERY aggressive and could cause damage to the foundation.
SOME roots are above the ground, humped up in 3 places in between the house and the tree by about a 8 foot span)
I was told to drill into them, and put copper sulfate in the holes and in doing so would kill those specific roots, and enable the tree to survive ( I must confess i like the shade and privacy it offers )
I honestly don't know what to do to stop worrying about these roots and years down the road.
I could get the whole tree removed in a year when I am ready, and if so, I guess the roots will just stop growing. If the copper sulfate trick is not an intelligent option, I may have to consider having the tree taken down entirely, but i wanted to ask people FAR more knowledgeable than i am before making any commitments.
Here is a photo of the edge of the house and the tree.
I appreciate your time and thank you.

 

[Sidecarflip]

It works. Called 'Vitrol Blue' around here. Comes in crystals or liquid.

 

[RTAW]

It works. Called 'Vitrol Blue' around here. Comes in crystals or liquid.

thanks, i guess ill have to give it a shot.

 

[Sidecarflip]

Had a large one (Maple) behind my shop and had one of my customers cut it down and ten ground the stump and roots out (big job but I own a large stump grinder),, trouble with maples is, the roots really spread out and above ground too. I do pretty good, just grinding out stumps for my arborist customers who seem to never own a grinder which is good for me.

 

[RTAW]

Had a large one (Maple) behind my shop and had one of my customers cut it down and ten ground the stump and roots out (big job but I own a large stump grinder),, trouble with maples is, the roots really spread out and above ground too. I do pretty good, just grinding out stumps for my arborist customers who seem to never own a grinder which is good for me.

thanks, the ones bulging out of the lawn are 4 inches and more in diameter, I guess I'll drill them and fill them with the crystals and add water.

 

[Sidecarflip]

No need to add water, just crystals. The sap will dissolve them. Use a Ship Auger to bore the holes.