wrote in message
ups.com...
Does anybody know where I could possible get hold of cavity wall
specs ? basically I'm looking at managing a extension project myself
but I want to be sure that everything is done right and according to
BC. Some of the builders I have had in for a quote tell me that for
the floor be it solid or wooden, they have to dig about 8" down and
then build it up with a mixture of hardcore, insulation and DPM, is
this correct ?

Only eight inches?..
mine was dug down by about 6 feet and a concrete raft laid with more steel
in it than a motorway bridge..
then the floor was laid about 2-3 feet thick with more steel in it.
If it ever sinks I should be able to put a cable under each corner and lift
the damn thing if I can hire a big crane.

Totally ott as the house next door has 3 foot deep strip foundations and
there aren't any mines or anything like that here.