So we bought a new shower unit for the "new Bathroom"
and of course there was no possible way to get it >>IN
so we buy a 4 ft wide sliding window and plan for the R.O.>
to accommodate  the > getting it in
upon removing the old window i made a 
grizzly discovery
absolutely NO insulation found !!!   oh the Horror....
you carpenters will appreciate this:
the actually measurement 2 inches by 4 inches 2 x  4's
still have the BARK on them   ahhh ha ha ha  
