Building Superintendence: A Working Guide to the Requirements of Modern American Building Practice and the Systematic Supervision of Building Operations

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American school of correspondence, 1907 - 200 стор.
 

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Сторінка 115 - The bond and other arrangements will depend upon the circumstances of the case. The surfaces connected should be fitted as accurately as practicable, so that by using but little mortar no disunion may take place from settling. As a rule, it is better that new work should butt against the old, either with a straight joint visible on the face, or let into a chase, sometimes called a "slip-joint...
Сторінка 115 - ... so that the straight joint may not show ; but if it is necessary to bond them together the new work should be built in a quick-setting cement mortar and each part of it allowed to set before being loaded. In pointing old masonry all the decayed mortar must be completely raked out with a hooked iron point and the surfaces well wetted before the fresh mortar is applied.
Сторінка 103 - Brick should not be merely laid, but every one should be rubbed and pressed down in such a manner as to force the mortar into the pores of the bricks and produce the maximum adhesion; with quicksetting cement, this is still more important than with lime mortar. For the best work it is specified that the brick shall be laid with a "shove joint...
Сторінка 103 - ... practice is objectionable ; it interferes w.ith the setting of the mortar, and particularly with the adhesion of the mortar to the brick. Watery mortar also contracts excessively in drying (if it ever does dry), which causes undue settlement and, possibly, cracks or distortion. The bricks should not be wetted to the point of saturation, or they will be incapable of absorbing any of the moisture from, the mortar, and the adhesion between the brick and mortar will be weak. The common method of...
Сторінка 109 - ... Stone shall not be laid in freezing weather, unless directed by the engineer. If laid, it shall be freed from ice, snow or frost by warming; the sand and water used in the mortar shall be heated. 17. With precaution, a brine may be substituted for the heating of the mortar. The brine shall consist of one pound of salt to eighteen gallons of water, when the temperature is 32 degrees Fahrenheit; for every degree of temperature below 32 degrees Fahrenheit, one ounce of salt shall be added.
Сторінка 103 - They also have a way after mortar has been sufficiently applied to the top l>ed of brick, to draw the point of their trowel through it, making an open channel with only a sharp ridge of mortar on each side (and generally throwing some of it overboard), so that if the succeeding brick is taken up, it will show a clear hollow, free from mortar, through the bed. This enables them to bed the next brick with more facility, and avoid pressure upon it to obtain the requisite thickness of joint.
Сторінка 103 - Masons have a habit of laying bricks in a bed of mortar, leaving the vertical joints to take care of themselves, throwing a little mortar over the top beds and giving a sweep with the trowel which more or less disguises the open joint below. They also have a way after mortar has been sufficiently applied to the top bed of brick, to draw the point of their trowel through it, making an open channel with only a sharp ridge of mortar on each side (and generally throwing...
Сторінка 129 - Moisten the surface of dry and porous stones before bedding them, in order that the mortar may not be dried too fast and reduced to powder by the stone absorbing its moisture.
Сторінка 129 - The rougher the stones the better the mortar should be. The principal object of the mortar is to equalize the pressure ; and the more nearly the ston.es are dressed to closely fitting surfaces the less important is the mortar. Not infrequently this rule is exactly reversed ; ie, the finer the dressing the better the quality of the mortar used.
Сторінка 92 - American glazing plate is made in one quality only, and is usually one-quarter inch thick tor ordinary sizes, but is necessarily thicker for large lights, and may be obtained in sheets as large as twelve by seventeen feet. Plate glass is absolutely straight, being cast on a perfectly flat cast iron table and rolled to the required thickness. The rough plate thus formed is carefully examined for flaws which are cut out, leaving as large a sheet as possible which is polished. French plate may be distinguished...

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