As compared to stretcher course, the thickness of joints in header course should be A. Less B. More C. Equal D. Equal or more

The correct answer is: B. More

The thickness of joints in header course should be more than the thickness of joints in stretcher course. This is because header courses are subjected to more stress than stretcher courses. The extra thickness of the joints helps to distribute the stress more evenly and prevents the bricks from cracking.

Here is a brief explanation of each option:

• Option A: Less. This is incorrect because the thickness of joints in header course should be more than the thickness of joints in stretcher course.
• Option B: More. This is the correct answer.
• Option C: Equal. This is incorrect because the thickness of joints in header course should be more than the thickness of joints in stretcher course.
• Option D: Equal or more. This is incorrect because the thickness of joints in header course should be more than the thickness of joints in stretcher course.