Envelope

for the purposes of Part 2.6 and Part 3.12 in Volume Two, means the parts of a building’s fabric that separate artificially heated or cooled spaces from—

1. (a) the exterior of the building; or
2. (b) other spaces that are not artificially heated or cooled.

for the purposes of Section J in Volume One, means the parts of a building’s fabric that separate a conditioned space or habitable room from—

1. (a) the exterior of the building; or
2. (b) a non- conditioned space including—
   1. (i) the floor of a rooftop plant room, lift-machine room or the like; and
   2. (ii) the floor above a carpark or warehouse; and
   3. (iii) the common wall with a carpark , warehouse or the like.

for the purposes of Part 2.6 and Part 3.12, means the parts of a building’s fabric that separate artificially heated or cooled spaces from

1. (a) the exterior of the building; or
2. (b) other spaces that are not artificially heated or cooled.

<building> external walls, above the ground level, and roof of the building including windows, doors, skylights etc