Built a house 5 years ago. The chimney chase was framed up with OSB,
then had a facade of Centurian Stone applied. This is cast concrete
pieces shaped and colored to look like natural stone, with mortar
between all pieces.
When the chase was complete, but before the facade was applied, it
leaked like hell. The idiot homeowner (that's me) asked the idiot
builder, "whiskey, tango, foxtrott!??" Builder replied that fake
stone facade would be the waterproofing. Fake stone facade was
appplied during midst of summer, and as luck would have it, during a
drought. The rainy winter that followed taught me otherwise.
Manufacturer of Cent. Stone expressed opinion similar to my own of
builder's competence when asked about his claim of waterproof nature
Anyway, still have an intermittent leak during the wettest of weather.
Presuming that the facade becomes saturated and passes water to OSB
underneath, can you recomend a sealant that would prevent this. Such
as a silox sealant?