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There are many things to consider when designing a masonry building. All masonry veneer walls experience all types of stresses due to weather, ground movement, characteristics of the products being used and the overall design of the wall. For this reason, certain design elements have to be
considered. Control joint spacing, wall reinforcement, and mortar type all affect the performance
of the finished wall. There are many misconceptions about these topics that need to be addressed.
Our goal is for you to have a problem-free job when using our PRAIRIE stone products.
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The masonry walls that you design MAY CRACK unless
you design it with the following in mind:
Type N Mortar
Type S mortar is too strong and may create hairline shrinkage cracks.
The more cement the more shrinkage.
Horizontal Joint Reinforcement
9 gauge galvanized 4" ladder type horizontal joint reinforcement should be installed every
16" O.C. on units up to 8" high. When installing 12" or 16" high units, joint reinforcement
should be installed at every course. In this case, to maintain a 3/8" bed joint, seismic wall ties
and a single 9 gauge galvanized rod should be used.
Wall Ties
Typical brick wall ties can be used depending on the backup structure. When using single
rod wire in every course, seismic wall ties are available.
Control Joints
Important considerations need to be made when determining control joint placement.
The height of the PRAIRIE stone wall should be considered when determining the maximum
spacing distance. A suggested maximum of 20' should not be exceeded. Included are some
NCMA Tek Notes that address the placement of joints. Typical locations are as follows:
approx. 4'-6' from corners, all inside corners especially at piers, at wall height changes and
at the side of any large window or opening. If the opening is over 6' control joints should be
on both sides of the opening.
Mortar Additive
All PRAIRIE stone units are manufactured with an integral water repellent called DRY-BLOCK
by Grace Construction Products. Putting the mortar additive in the mortar will complete
the water repellent system of the wall and increase the bond strength of the mortar.
Caulking Sills & Coping
All window sill and coping unit head joints should be raked and caulked with a matching color
which will be practically unnoticeable. Flashing should always be used below these units.
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All of these points will have an affect on the end result of you project. These are good standard
masonry practices that need to be considered when designing with architectural masonry products.
Superior Design + Quality Products + Outstanding Installation = Award Winning Projects
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