"Lawrence Zarb" wrote in message
news:ab311db328d41a2c533c3e11bd589a01.52329@mygate .mailgate.org...

does anyone know of a good on-line site giving details of how to
construct cavity walls

Why? Why build two walls when one can do. There is nothing in the regs
that says cavity walls "have" to be built. The Germans think we are mad.
Build one strong skin and use the rest of the space taken up by the other
skin for insulation to drop your heating bills substantially. Don't just do
what the other dickheads do. Think!