6. Which of these is true? A. In hot weather, fresh mortar must not dry out. B.
ID: 1713185 • Letter: 6
Question
6. Which of these is true? A. In hot weather, fresh mortar must not dry out. B. In cold weather, fresh mortar water must not freeze. C. In hot weather, masonry may have to be wetted before laying. D. a and c only. E. All of the above. 7. What effect on compressive strength does through-wall flashing have? A. It increases compressive strength. B. It reduces compressive strength by 10 to 25 percent. C. It has no effect on compressive strength D. It reduces compressive strength by 30 to 50 percent 8. Identify the locations where flashing should be installed in masonry construction. A. at changes in wall thickness, at the bases of walls, at building corners, under sills of wall openings B. at the bases of walls, under sills of wall openings, over heads of wall openings, where masonry penetrates a roof C. where masonry penetrates a roof, at building corners, over heads of wall openings, under sills of wall openings D. at changes in wall thickness, where masonry penetrates a roof, over heads of wall openings at vertical intervals of not more than ten feetExplanation / Answer
6. In hot water, masonry may have to be wetted before laying. Because its necessary to maintain water content in masonry. If it is not done so, bonding between concrete and masonry will not be proper.
7. Through he all flashing has no effect on compressive strength. It just passes moisture of wall towards outward part of wall and prevent outside moisture to enter inside the wall, in short preventing damage done by moisture to wall.
8. Where masonry penetrates a roof, at building corners, over heads of wall openings, under sills of wall openings, through-wall flashing can be installed to prevent moisture to enter inside or to take out inside moisture of wall to outwards.
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