Gable end wall warning

Never ran across this one before - This gable end wall has a warning about being combustible.

I reckon that plywood or OSB gable walls can be said to be combustible as well. but as a homeowner this warning might give me pause.

Comments? Thoughts?


Looks like it’s not water resistant either.

Nope - and has been stuccoed over on the outside - with a whole lot of cracking going on!!

Black board.
asphalt impregnated fiberboard…ie celotex fiberboard

The label has to do with the flame spread and smoke developed rating of the fiber-board.