Using Pex 1/2 in BB HOt water heat.When going through the floor do you use a bend support to make the 90 and how far after the 90 should be the minimum distance to connect to the copper Base board. What would be the minimum hole size and do you use a sleeve of some sort going through the hole.Would it hurt to have a loop before or after going through the floor it case you have to redo connection in future.