The bathroom tile project moves forward.

In the top photo we have the rotted studs and window sill removed and replaced with fresh new 2 by 4s. 

Next we have installed insulation. Extruded foam board, a two inch piece and a one inch piece to completely fill the space between the 2 by 4 studs.  The foam board is held in lace with just friction, no glue.  This bit of exterior wall is now the best insulated wall in the house.

 And here we have the concrete board (Hardiebacker) up. The fit is pretty good if I do say so my self. 

And finally, the tile goes up.  Had to buy a carbide hole saw to cut the holes for the pipes.  Rented a tile saw to cut the fractional tile pieces. 

Still to do.  Grout the tile and make a new window casing.  We started this job on Monday and got the tile up on Friday.