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Building Design and Construction Handbook - Merritt - Ventech!

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WALL, FLOOR, AND CEILING SYSTEMS 11.13<br />

Cleanouts should be provided for every pour. This may be done by omitting<br />

every other unit in the bottom course of the wall section being poured. Before grout<br />

is placed, excess mortar, mortar fins, <strong>and</strong> other foreign matter should be removed<br />

from the grout space. A high-pressure water jet may be used for the purpose. After<br />

inspection but before placement of grout, the cleanout holes should be plugged with<br />

masonry units, which should then be braced to resist the grout pressure.<br />

Wire ties should be inserted in the mortar joints between masonry courses <strong>and</strong><br />

span across each grout space, to bond the wythes (Fig. 11.5). The ties should be<br />

formed into rectangles, 4 in wide <strong>and</strong> with a length 2 in less than the distance<br />

between outer faces of the wythes being bonded. The wire size should not be less<br />

than No.9. Spacing of ties should not exceed 24 in horizontally. For running-bond<br />

masonry (Fig. 11.3ƒ), vertical tie spacing should not exceed 16 in, <strong>and</strong> for stackbond<br />

masonry (Fig. 11.3j), 12 in.<br />

11.3.4 Support Conditions for Walls<br />

Provision should be made to distribute concentrated loads safely on masonry walls<br />

<strong>and</strong> piers. Heavily loaded members should have steel bearing plates under the ends<br />

FIGURE 11.5 Grouted masonry wall: (a) cross section<br />

at the roof; (b) cross section at the base of the wall.

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