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High-lift grouting =
Grouting of hollow wall after it is built fairly
high; grout is poured in lifts of around four feet.
Hod =
V-shaped, long-handled carrier for mortar.
.
Hog =
Improper laying, where one end of the wall has
more courses than the other end, although both
ends are the same height. Caused by different
masons working on wall ends.
.
Hollow brick =
A masonry unit whose net
cross-sectional area in any
plane parallel to the bearing
surface is less than 75% of its
gross cross-sectional plane
area.
Hydrated lime =
Quicklime treated with water; used in masonry
mortar. Also called
slaked lime.
Initial set =
Beginning of mortar set.
Intrados =
Bottom course of an arch; opposed to extrados.
IRA =
Initial Rate of Absorption. Weight of water
absorbed by a brick calculated in grams per 30
square inches of contact surface when brick is
partially submerged in water for one minute.