Masonry Magazine January 1962 Page. 45
Laying Out Walls
If the joints in alternate courses will center over the brick. If the wall length is 20 ft. or greater, place a 4-in. header at one corner and a 10-in. stretcher at the other. Then measure the wall length between the corner. This length multiplied by the multiplier gives the number of red marks plus the black marks left over, if any. If the number is in full red marks or if there are no black marks left over, the wall between corner units will be in full stretchers.
If there are one or four black marks left over, turn the corner header around so that it becomes a 10-in. stretcher. Then deduct one black mark from the total count and stretch the line.
If there are two or five black marks left over, turn the 10-in. corner stretcher around so that it becomes a 4-in. header. Add one black mark to the total count and stretch the marked line.
After the first wall of the building is laid out, the remaining walls will have at least one corner on which the corner unit is already determined. Thus the corner unit at one corner only can be shifted to help the layout. Always make every effort to avoid a brick being placed in the wall. If three or four black marks are left after red marks are subtracted, always change one corner unit to make either one less or one more black mark.
For 12-in. units in ½ bond, the marked line indicates joints on alternate courses only. On intervening courses the joints are centered between marks. If the units are laid in stack ½ bond the marked line will work for each course.
Matching the Marked Line for "SCR brick"*
The selection of 10 units and measuring them is done the same as with Roman and Norman brick. Table IV is used to obtain the multiplier. In laying out "SCR brick" it is best to keep to full and half units. A half unit is represented by either 1½ or 4% black marks. The decimal equivalent for 1½ black marks is 25 and for 4% black is 75. When the wall is of reasonable length, say 20 ft. or over, it should be worked to the nearest full or half "SCR brick," that is, either a header or a stretcher at each end or a header at one corner and a stretcher at the other with full units between.
Since "SCR brick" are usually laid in bond, the marks on the line indicate joints only on alternate courses. If these units are laid in stack bond, the marked line will work for each course.
PLANNING THE JOB
The successful use of the "SCR masonry process" requires that some thought be given to how best to set the job so as to use the available crew and equipment to the best advantage. For any given job, the size of the crew and the amount of available scaffolding are most important in determining the best set-up. The ideal situation would be to have a large enough crew and sufficient scaffolding to completely surround the structure, so that corner poles could be set up completely around the building and all walls carried up at the same time. This is seldom possible, however. Therefore, with proper placement of corner and intermediate poles, the job should be broken up into sections of a size that the crew can handle with the scaffolding that is available.
Whenever possible, the intermediate poles should be located at a door jamb, to provide a vertical stopping point for the masonry. If this is not possible, a window jamb can be used and the masonry "tailed-out" under the window. Setting and plumbing the door and window frames in advance of the masonry work on load-bearing jobs will simplify the mason's work, since he will not have to constantly plumb the masonry jambs.
These points can best be illustrated by some examples. Figure 9 indicates the foundation of a simple rectangular building, about 28' x 38' in dimensions. There will be a door approximately in the center of each of the longer dimensions.
As mentioned before, an ideal situation would be to have enough scaffolding to go completely around the house and, in this case, a crew of 7 or 8 masons. Four corner poles could then be erected and all four walls could be laid up at one time (Figure 10). This is seldom possible, however.
A more realistic situation would be a crew of 4 masons and enough scaffolding to extend halfway around the house. In this case, corner poles would be set at two corners and an intermediate or trig pole set at one edge of each of the door jambs (see Figure 11). Scaffolding would be set up around half the house from door jamb to door jamb. The crew then would complete the masonry work for half the house working from door jamb to door jamb. Then seaf