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Q: Which of the following is NOT a characteristic of ashlar stone masonry?
  • A. Every stone must be cut to the required size and shape to give truly vertical and horizontal joints
  • B. Horizontal and vertical lines should not vary more than 3 mm and 6 mm, respectively
  • C. No point on the faces should vary more than about 1 mm when tested with a 60 cm straight edge
  • D. No portion of the dressed surface should be more than 10 mm from a straight edge placed on it
Correct Answer: Option D - Ashlar stone masonry– We have seen that the difference between rubble and ashlar masonry is that in ashlar masonry, every stone must be cut to the required size and shape to give truly vertical and horizontal joints. No paint on the faces should vary more than about mm when tested with a 60 cm straight edge. Horizontal lines should not vary more than 3 mm and vertical lines more than 6 mm. • Thus dressing ashlar masonry is costlier than rubble masonry. • In short the complete work will look like brickwork in stone.
D. Ashlar stone masonry– We have seen that the difference between rubble and ashlar masonry is that in ashlar masonry, every stone must be cut to the required size and shape to give truly vertical and horizontal joints. No paint on the faces should vary more than about mm when tested with a 60 cm straight edge. Horizontal lines should not vary more than 3 mm and vertical lines more than 6 mm. • Thus dressing ashlar masonry is costlier than rubble masonry. • In short the complete work will look like brickwork in stone.

Explanations:

Ashlar stone masonry– We have seen that the difference between rubble and ashlar masonry is that in ashlar masonry, every stone must be cut to the required size and shape to give truly vertical and horizontal joints. No paint on the faces should vary more than about mm when tested with a 60 cm straight edge. Horizontal lines should not vary more than 3 mm and vertical lines more than 6 mm. • Thus dressing ashlar masonry is costlier than rubble masonry. • In short the complete work will look like brickwork in stone.