On 4 Oct, 19:42, "ARWadsworth" wrote:
When you are bricking up an external door are you supposed to "open up" and
expose the existing wall cavity or do you just brick up the gap (with it's
own cavity)?

--
Adam

Further to above, if your house is very old it may have no insulation
at all in the cavity. If it is very new it may have a "partial fill"
system, ie ridgid boards fastened to the inner leaf of brickwork by
clips on the wall ties. This is only likly on houses less then ten/
fifteen years old.
Things will start to become apparent when you remove the door frame.