"David W.E. Roberts" wrote in message ...

I think you are about right except in a couple of places:

Joist hangers are pretty easy - obvious when you look at them.
You should be able to replace your joists with new joists in the same
position if you use joist hangers.

I believe there are two main types of hangers. One for use during
building. The bricklayer puts them in instead of leaving an hole for
the joists. The other is more general. You nail them over the
"trimmer" or joist to which you will be butting up to.

You need the kind which fit flat to the wall/beam and are secured by
rawlbolts or similar.

This one is a new one on me. (I spy a trip to a timber yard before
long.)
As a rough guide - and with no warranty attached:

AFAIK you secure the joist to the joist hanger with nails - at least there
are loads of nail shaped holes in the sides of the hangers :-) Before you do
this you may need to knock small wedges between the bottom of the hanger and
the end of the joist to ensure the joist is tight up against the floorboards
above.

Use zinc treated clouts and do not use wedges rather choose a size of
hanger that is a little smaller than the joist so you have to notch
out an housing. This will allow you to put the plasterboard flush.

Oh, and you will have to remove and replace the nails which are through the
floorboards into the joist - this may be all that is holding the old joist
together :-)

Plenty of dust sheets and a filter-mask if there is any poison in the
timbers.

And now the biggie:

Why didn't Rentokil replace the joists? It's unusual for them to miss
a section and the guarantee should cover it all, surely?