As a somewhat accidental and mostly reluctant landlord, who has found himself undoing other people's "improvements" to my rental properties (one little house, and one duplex), all I can say, in my best WJ Clinton accent, is I feel your pain. It just galls me to tear out and throw away materials that were improperly installed not very long ago. But there is no reasonable alternative, lest I make myself guilty of the very crimes I rail against, so tear it out and throw it away I do. I take it as a sign of disrespect to the skilled craftsmen of this world that people with no experience whatsoever think they're up to a job they really aren't. It's not that a homeowner can't do most things around the house, if he's willing to ask a lot of questions and take a lot of time. But so many do neither. Me, I know what I don't know. I clean, and paint, and sometimes help with more specialized jobs, provided I'm not just putting myself in the way (I have friends who know these things much better than I ever will). The rest of it I leave to the professionals. In the end, it costs a lot less that way, and it goes much quicker.