Joint Types and Weather Resistance
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Mortar joins masonry units into an integral structure. Whether
you choose concrete masonry or clay bricks, the mortar must create
tight seals with masonry units to keep out air and water.
Mortar has to fill the joint completely.
- On new construction, this is accomplished by spreading an adequate
amount of mortar to create a bed. Vertical ends of units are “buttered,”
or coated with fresh mortar before placing them against the preceding
unit. These are known as “head” joints and must be
completely filled and tooled for maximum weather resistance.
- On tuckpointing projects, old mortar is removed and joints are
cleaned out so they can receive new mortar, which has to be tightly
packed into the space. (Click
here for diagram)
Mortar joints can be tooled or untooled, although the tried-and-true
concave joint is the most popular and durable of all joints. (Fig.
9-7) The V-joint and weathered joint are the next most durable.
(Figs. 9-8 and 9-14) The other styles have other uses. For instance,
the flush joint may be used when the masonry is to receive a stucco
finish. Most of the other styles are primarily for creating specific
architectural appearances. Joints in milder climates and interior
exposures can be finished in any style.
For more information, see: (Click on title)
Building Weather-Resistant
Masonry Walls, IS220
Concrete Masonry Handbook
for Architects, Engineers, Builders, EB008
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