JOINT DETAILS AND WALL PATTERNS
A wide variety of architectural effects can be produced by using
various wall patterns in combination eith suitable joint details.
A few patterns are shown and it is hoped that the designer will
be stimulated to create his own wall and joint details.
In stack bond with standard units there is direct vertical core
alignment and also vertical block alignment. In using the stack
bond pattern it is advisable to use open end block. Stack bond may
also be obtained by using scored blocks and running bond.
Common Bond, Coursed Ashlar, Random Ashlar
Pattern designs as illustrated on page D3 vary from the simple
and more common bond forms to the complex random ashlar type. All
of these patterns have direct vertical core alignment. Where continous
horizontal mortar joint lines are shown. It is possible to use 7/16"
and 1/2" horizontal mortar joints, but in using the more complex
ashlar patterns the standard 3/8" modular joints must be used.
MORTAR JOINTS & TOOLING
Tooling will compress the mortar firmly against the
block, thereby assuring bond between mortar and blocks to prevent
moisture infiltration into the wall. To insure weather-tightness,
it is recommended that the excess mortar be struck downward with
the trowel (rather than upward), then the flush face rubbed with
a carpet-faced wood float.
Joint 6 should only be used in garden walls, interiors, or weather
protected walls since the ledge collects water. The effective thickness
of the wall is reduced with the use of this joint and engineering
calculations should be carefully checked.
Joints 6, 7, and 8 are not recommended as they are not weathertight,
but these joints can be satisfactorily used in garden walls, interior
walls, or weather-protected walls.
To create a long and low effect in a wall, the "V"
or concave horizontal mortar joint may be used with a flush or sacked
vertical joint. The tool for making the concave "V" joints
should be 24" long, which length will span from one block to
another, helping to keep the horizontal lines straight.