Thickness of masonry veneer

[sunyaer]

The following articles are from Ontario building code Division B, part 9:
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9.20.6.4. Masonry Veneer
(1) Except for masonry veneer where each masonry unit is supported individually by the structural backing, masonry
veneer shall consist of solid masonry units not less than 70 mm thick.

(2) Veneer described in Sentence (1) over wood frame walls shall have not less than a 25 mm air space behind the
veneer.

(3) Masonry veneer less than 90 mm thick shall have unraked joints.

(4) Masonry veneer shall conform to Subsection 4.3.2. where the masonry units are required to be individually
supported by the structural backing.
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9.20.12.3. Corbelling for Masonry Veneer
(1) Masonry veneer resting on a bearing support shall not project more than 25 mm beyond the supporting base where
the veneer is at least 90 mm thick, and 12 mm beyond the supporting base where the veneer is less than 90 mm thick.

(2) In the case of rough stone veneer, the projection, measured as the average projection of the stone units, shall not
exceed one-third the bed width beyond the supporting base.
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Questions:

1. In what situations each masonry unit of masonry veneer is supported individually by the structural backing?

2. In an usual one-garage house in Canada or Ontario, if there is masonry veneer, is each masonry unit of the masonry veneer supported individually by the structural backing (for example, steel lintel or foundation wall)?

3. Is there a minimum thickness requirement for the masonry veneer in article 9.20.12.3. Corbelling for Masonry Veneer?

 

[sunyaer]

I would like to add this question too:

1. In what situations each masonry unit of masonry veneer is NOT supported individually by the structural backing?

 

[tmurray]

1. Typically, this is referring to specialized fasteners which can be found in cultured stone applications.

2. Not usually. Usually reinforcement is provided as mentioned with each unit bearing on the one below. Lateral reinforcement (to keep it from falling over) may also be provided.

3. There is no minimum thickness required.

Follow-up question:

1. In most situations. A good example would be brick.