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King closure =
Closure made using a
brick with one corner cut
off diagonally to give one
two-inch end and one full-
width end.
Laitance =
A layer of weak material containing cement and
f
ines from aggregates, which is brought to the
surface of overwet concrete by the bleeding of
water to the top.
Lap =
Distance one masonry unit extends over another.
Lateral thrust =
Pressure from the side/horizontal load, for
example, on the outside of the base of a round
arch.
Lead =
Built-up masonry corner used as a guide in
laying a wall.
Lean concrete - lean mortar =
Concrete or mortar of low cement content and
thin consistency. Opposite of fat concrete or
mortar.
Lift =
Height of grout, mortar or concrete placed at one
time from one pour or application.
Lime =
Quicklime made by burning off calcium dioxide
from limestone.