The following is from Ontario Building Code, division B, part 3
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3.1.5.10. Combustible interior Finish
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(2) Combustible interior wall finishes, other than foamed plastics, are permitted in a buildingrequired to be of noncombustible constructionprovided they,
(a) are not more than 25 mm thick, and
(b) have a flame-spread rating not more than 150 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction.
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Is there a real example where “any surface that would be exposed by cutting through the material in any direction” would need to be examined for having a flame-spread rating not more than 150 ?
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3.1.5.10. Combustible interior Finish
…
(2) Combustible interior wall finishes, other than foamed plastics, are permitted in a buildingrequired to be of noncombustible constructionprovided they,
(a) are not more than 25 mm thick, and
(b) have a flame-spread rating not more than 150 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction.
———————————————————
Is there a real example where “any surface that would be exposed by cutting through the material in any direction” would need to be examined for having a flame-spread rating not more than 150 ?