I'm looking at sections 1(1)(b) and 20 of the Party Wall Act, and they just don't make sense to me, definitionally.
Problem #1: s.20 seems to provide an impossible or meaningless definition
s.20: “party fence wall” means a wall (not being part of a building) which stands on lands of different owners and is used or constructed to be used for separating such adjoining lands, but does not include a wall constructed on the land of one owner the artificially formed support of which projects into the land of another owner
The phrase excluding "a wall constructed on the land of one owner the artificially formed support of which projects into the land of another owner" could be read ambiguously.
- IT EITHER MEANS: "a wall constructed entirely on the land of one owner (A), the artificially formed support of which projects into the land of another owner (B)";
- OR IT MEANS: "a wall constructed partly - but not entirely - on the land of one owner (A), the artificially formed support of which projects into the land of another owner (B)"
The problem is, both of these are problematic, whichever is chosen.
If the first interpretation is correct, then the wall being excluded cannot ever have been a candidate party fence wall in the first place, because to even consider it as a party fence wall, the wall must stand on more than one person's land ("a party fence wall means a wall .. which stands on lands of different owners..."). No walls will ever be excluded if the first interpretation is correct. The clause would be meaningless.
If the second interpretation is correct, then we have the opposite problem. If it is intended to signify a wall constructed in part but not entirely on (A)'s land, then basic wall construction dictates that the wall's support will always project into another owner (B)'s land, because walls are supported under their full width. Every wall that could be a party fence wall will be excluded if the second interpretation is correct. The definition wouldn't cover any walls at all.
This is a quick sketch of the 3 ways a wall could be placed and supported near a boundary:
Layouts #2 and #3 aren't party fence walls because the wall itself is completely within the property boundary of B, so it doesn't "stand on lands of different owners".
Layout #1 can be a party fence wall, - but only if the exclusion clause has an ineffective/nullifying interpretation: "_a wall built on just one owner's land entirely/exclusively/only". If that's correct then no wall that looks like layout #1 ever gets excluded, so Layout #1 will always be deemed a party fence wall. (If we had made the alternative assumption, that it means "built partly but not entirely on an owner (A)'s land" then the Layout #1 wall is clearly built partly on (A)'s land and its support clearly projects into another owner (B)'s land, so Layout #1 could never be a party fence wall. In which case nothing could.)
What approach to reading the exclusion clause wording would allow it to have a sensible meaning, which presumably should exclude some walls but not others?
Note: I'm asking about the meaning in law of the legislative wording, rather than "what it might be believed or assumed to mean", as these could be completely different.