Page 341 - Masonry and Concrete

Masonry Garden Walls

340 CHAPTER NINE

35% 32% 22% 42% 56% 42%

55% 47% 77% 82% 68% 53%

RELATIVE COMPRESSIVE STRENGTH OF UNITS LAID AS SHOWN EXPRESSED
AS A PERCENTAGE OF COMPRESSIVE STRENGTH WHEN LAID WITH HOLLOW
CORES VERTICAL

FIGURE 9-30
How screen block design, shape, and orientation influence strength. (adapted from
NCMA, TEK 5, National Concrete Masonry Association, Herndon, VA).

9.6 Stone Garden Walls

Stone garden walls can take one of two
forms. A dry-stack wall gives a very rus-
tic appearance but is time-consuming
and labor intensive to build properly. A
mortared wall is more formal, especially
if it is built of cut stone rather than rub-
ble. The style of the home and its budget
will dictate which type of stone wall is
most appropriate.

9.6.1 Dry-Stack Stone Wall
ROOFING FELT
OR BUILDING PAPER Dry-stack stone walls are built without mor-
TO PREVENT
MORTAR BOND tar. Friction, gravity, and the interlock of the
individual stones hold the wall together.
FIGURE 9-31 These walls are simple to build and do not
Control joint at pilaster. require concrete footings. The stones may
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