"Graeme" wrote in message
...
SNIP lot of good stuff

Draw a line on the wall with a pencil exactly where the top edge is,
then
fill the bath with water and draw another line - you'll be amazed how
far
it
moves. A bath full of water weighs a huge amount !

The bath itself flexes, the floor will go down a bit, and the leg
structure
will compress - it all adds up. Best case is a cast iron bath on a
concrete
floor. Worst case is an acrylic bath on a chipboard floor !

I had assumed that the bath would move a.little depending on the amount of
water and people (;-) that are in it. I did your experiment of drawing a
line with the bath empty, and then full. The lines are in exactly the same
place! Not 0.5mm difference. This is an acrylic bath on chipboard
(although
the bath's feet are directly over the joists).


Graeme,

I'm glad to hear it but a bit suprised ! Maybe the joist span is very small
? or is it a very small bath ? - anyway it's good news for the longevity of
your seal ! (says he who has to repaint the downstairs loo ceiling AGAIN as
the seal failed on out first floor bath behind the taps!)

Andrew Mawson