I've been searching around for an answer or pointers on this for a while, it's possible I'm using the wrong phrases when searching!
I have a UK 1930's built semi-detached house, Streetview pic before it was repainted:
The room over the porch has always been quite cold and I was looking at insulating the floor of it using rockwool or similar. Construction of this ceiling is lath and plaster, ~300mm separated joists and standard floor boards.
My only worry is how best to go about doing this, there are a couple of cables in the floor which go to outside lights, from what I've read, any insulation should go under these which is fine. My main questions are, do I need a moisture barrier underneath, am I better off with loosefill instead of rockwool and is there anything else I should be concerned about before doing this?