The thickness of brick walls for dwellings not higher than three
stories ought to be 12 inches, although 8 inches is considered by many
experts to be quite thick enough for small houses. If the foundation
walls are of rubble-stone they should be 8 inches thicker, and if of
brick or concrete they should be 4 inches thicker. Usually the walls
will be faced with some variety of face brick, in which case they
should be bonded into the wall. If a running bond is used, the face
brick should be bonded into the backing at every sixth course by
cutting the corners of each brick in that course of face brick and
putting in a row of diagonal headers behind them, and also using
suitable metal anchors in bonding courses at intervals not exceeding
3 feet. Where Flemish bond is used, the headers of every third course
should be a full brick and bonded into the backing. If the face brick
is of different thickness to that of the common brick backing, the
courses of the exterior and interior should be brought to a level bed
at intervals of about eight courses in height of face brick, and the
face tied into the backing by a full header course or other suitable
method.
[Illustration: FISKLOCK BRICK]