External wall

Approved document C, Site preparation and resistance to contaminants and moisture, suggests that a wall is: 'Any opaque part of the external envelope of a building that is at an angle of 70° or more to the horizontal.'

An external wall is a wall forming the external enclosure of a building.

Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), suggests that the external wall of a building includes all of the following:

• Anything located within any space forming part of the wall.
• Any decoration or other finish applied to any external (but not internal) surface forming part of the wall.
• Any windows and doors in the wall.
• Any part of a roof pitched at an angle of more than 70 degrees to the horizontal if that part of the roof adjoins a space within the building to which persons have access, but not access only for the purpose of carrying out repairs or maintenance.

[edit] Related articles on Designing Buildings Wiki

• Barrier wall system.
• Brick.
• Building fabric.
• Cavity wall.
• Coping and capping
• Curtain wall.
• Diaphragm wall.
• Dwarf wall.
• Façade.
• Load-bearing wall.
• Palisade.
• Rainscreen.
• Rubble masonry.
• Wall.
• What are walls made of?