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Img8089
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Item Code: 1712
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At the corners or leads, the mason uses his level to check each course for alignment, for level, and for plumb.
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Img4011
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Item Code: 1287
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They are placed in the wall in this manner: Two full block in the first course; two half block in the second, two full units in the next and so on up the wall, extending the control joint in a vertical line. Control joints are laid up in mortar, just as any other vertical joint, but ranked out as will be seen later.
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Img8087
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Item Code: 1710
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Face shell mortar bedding has the extra advantages of providing a continuous air space, and of interconnecting the air spaces of the cores. These air spaces also reduce the chance of moisture passing from one side of the wall to the other.
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Img4030
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Item Code: 1306
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Precast lintels can also be used, such as this unit, cast with an offset to receive a wood window head. Cast-in-place concrete lintels are not recommended.
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Img4032
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Item Code: 1308
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Where the roof is frame, anchor bolts are set in the top of the wall. A small piece of mesh is placed under the core in which the bolt is to be placed.
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Img4004
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Item Code: 1280
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The facing and backing can be tied together with metal wall ties or with joint reinforcement.
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Img4006
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Item Code: 1282
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This masonry bond is obtained by using a header block which is notched out to receive a brick.
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Img4008
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Item Code: 1284
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The header block can be placed notch down. This type of header unit is used for sixth-course bonding.
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Img4034
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Item Code: 1310
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After the mortar has set, the plate is drilled to fit over the bolts, and then fastened down.
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Img8088
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Item Code: 1711
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Having laid the first course of block, the mason then proceeds to build up his corners or leads.
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Img4024
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Item Code: 1300
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In some codes a reinforced concrete belt course or bond beam is required. This is formed by special U-shaped or trough-shaped bond beam blocks, which sometimes have grooves in the cross webs so the webs can be knocked out.
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Img4023
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Item Code: 1299
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The projecting mesh is bent down into the joint of the intersecting wall as it is laid.
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Img8084
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Item Code: 1707
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Special care is taken to insure that the corners and first course are laid to correct alignment, and are level and plumb. Any placement error will give continuing trouble in the rest of the wall.
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Img8085
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Item Code: 1708
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After the first course is laid on the footing, the mortar is usually applied only to the horizontal face shells of the block. This is called faceshell mortar bedding. Block should be laid with the thicker end of the face shell up, as this provides a larger mortar-bedding area.
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Img8086
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Item Code: 1709
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A few building codes still call for full mortar bedding, shown here. Although such bedding adds slightly to the strength of the wall, it uses much more mortar and requires more of the mason’s time.
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Img8092
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Item Code: 1715
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After the corners at each end of a wall have been laid up, a line is stretched tightly along the top outside edge of the corner blocks. This serves as a guide as each course is laid, and is moved up for each course. Notice how the mason keeps the top of
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Img4001
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Item Code: 1277
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When 12-in walls are laid up using a combination of 4-in. and 8-in. thick units, it is best to completely fill the joint between the units.
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Img4002
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Item Code: 1278
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Another type of wall in common use is a 4-in. face brick or concrete brick backed up with 8-in. concrete block.
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Img8095
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Item Code: 1718
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After spreading mortar on the bed joint for three blocks and buttering the head joints on three blocks, the mason will place all three blocks in rapid succession.
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