Page 263 - Masonry and Concrete

Masonry Veneer

262 CHAPTER SEVEN

UNIFORM LOAD

TOP OF
WALL
AREA OF LOAD ON LINTEL BELOW
APEX OF
NORMAL
LOAD
TRIANGLE
LOAD LINTEL LOAD

FIGURE 7-12
Area of load on a lintel without arching action.

thickness, lay the 2 4s flat. If the arch is more than one wythe thick
with the soffit exposed such as at an entry porch, lay the 2 4s the
other way. Place the centering flat on the ground and lay out the arch
pattern by positioning the masonry units around it. There should
always be an odd number of units or voussoirs so that the center unit
or key falls exactly at the center of the arch. All units should be full
size and the joints should be spaced evenly. Mark the position of the
units on the plywood to serve as a guide during construction. Place a
strip of roofing felt or polyethylene over the centering to keep mortar
from sticking to it. Recess the centering from the face of the wall
slightly so that the mortar joints can be tooled easily. Hold the center-
ing in place with temporary wood posts and wedges until at least
seven days after the arch is completed. Begin building the arch at the
ends or abutments. Lay the brick or stone from each end toward the
middle. In stone arches, take care to cut and lay the stone accurately
with thin joints to prevent settling of heavy units.
Brick arches can be built of special wedge-shaped brick or stone so
that the mortar joints are of uniform thickness, or they can be built of
standard rectangular brick with joint thicknesses varied to obtain the

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.