According to IS:1597, which of the following statements is incorrect with respect to general requirements for masonry construction?
- AThe stone shall not be laid in such a manner that the pressure is never perpendicular to the natural bed.Correct
- BIn the case of coursed rubble masonry, if the heights of the courses vary, the largest stone shall be placed in the lowest course.
- CVertical joints shall be staggered as far as possible.
- DBell shaped bond stones or headers shall not be used.
Solution
Concept
General requirements of stone masonry
Step-by-step solution
1. Stones must be laid so that the pressure acts perpendicular to the natural bed. 2. Statement A (with a double negative) says the opposite, so it is incorrect. 3. B, C and D are valid requirements.
Explanation
The pressure must be perpendicular to the natural bed.
Why the other options are wrong
B, C and D are correct IS 1597 requirements.
Shortcut
Load ⟂ natural bed.
Correct answer: A) The stone shall not be laid in such a manner that the pressure is never perpendicular to the natural bed.