Masonry Magazine December 2002 Page. 21
MASONRY COMPUTER ESTIMATING
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December 2002
Masonry 19
Significant cost savings of 40 percent or more can be achieved by using typical lengths and standard products, so they should be used whenever possible.
Longer lengths are available but generally should not exceed 15 times the minimum cross section thickness. Control joint spacing should be divided evenly across the size of the typical unit. Special corner and end units should be cast to suit the end-of-wall condition and intermediate units may be cut with a standard abrasive blade masonry saw.
For optimum economy with trim stones, maintain the maximum quantity of lengths at the same size; use a short or long piece at control joints as shown:
Maintain the same spacing between control joints to permit equal lengths of stones whenever possible.
Bridge copings over control joints to minimize the possibility of water intrusion. Set the long bridge section of coping in a full bed of mortar, and dowel the stone as shown. Set the short bridge section on elastomeric sealant to provide for movement. Provide end type dowel holes in thin copings or on raked wall to allow for added security as necessary Gun sealant into dowel hole in lieu of mortar
In many specifications today, architects are requiring layout drawings that call for the location of every joint on the building facade to be precisely located, while other designers desire standard products and consider custom products to be cost prohibitive. Significant cost savings of 40 percent or more can be achieved by using typical lengths and standard products, so they should be used whenever possible.
To avoid the need for layout drawings, try to submit the following procedures to the approving parties:
1. Follow the architect's jointing pattern as shown on contract drawings.
2. Cut units to suit in-place wall dimensions.
3. All window and door surrounds should consist of evenly sized units.
Designing choices
WINDOW SILLS SHOULD be sized to fit the masonry opening or mullion spacing, with allowance for 3/8" joints.
The Voice of the Mason Contractor