It's also proper to put down a plastic moisture barrier under the carpet when doing water claw work, but realistically who does that. Especially when the rooms are filled with furniture.While I respect your advice hugely I don't buy this one Jim and would be concerned at some taking your word as Gospel( Talking about the first part here as the second part is a given . We all want to look like Richard.
The surgical hospitals that we clean would have a hissy-fit if we suggested tearing out carpet due to a bit of blood.
roro