In article , dpb wrote:
Doug Miller wrote:
In article , dpb wrote:

The solvent problem I think can be discounted as being too far removed
in time

Maybe so, but it's also possible that the OP's memory of what was done when
is
imperfect, and that the solvent use was actually much more recent; that's
more
likely IMO than an internal heat source that doesn't cause *any* apparent
damage to the OSB, *or*, apparently, to the paint on the inside of the house.

He "forgot" this within the last two weeks?

No, I think he might have done it *this* spring instead of last. But Chris
Lewis also posted a plausible explanation of delayed effects.

I personally couldn't tell there was no apparent damage or not to the
OSB from the last pictures because all was shown was a fairly distant
view of the sheathing through the hole in the Tyvek so there was no way
to judge any coloration difference of that localized area vis a vis the
removed area.

I based my statement of "no apparent damage" on the fact that what's visible
in the photo looks about the same as any other OSB I've ever seen. And, of
course, there may be damage that's not readily apparent, so I'm not willing to
say "no damage". Just "no apparent damage".

Other than the possibility of the postulated arcing being almost
directly in contact w/ the inside wall of the sheathing, I agree it's
difficult to imagine there being such visible exterior damage w/o there
being any indication on the inner wall except for the fact that the
location is below the cabinet top and therefore, there presumably is a
back to the lower cabinets which is another layer of
protection/insulation/coverup.

In the original photo, the center of the damaged area can be seen to be at
roughly the same height as the handle on the sliding door. In the second set
of photos, that same handle is visible at roughly the same height as the
countertop backsplash -- thus, while some of the damage is indeed below the
cabinet top, not all of it is. Nearly half of it is above as well, and the
visibly damaged area on the outside definitely extends at least a short
distance above the top of the backsplash.

Overall, I'm still convinced from the picture it was external, it was a
heat source and most likely somebody pushed the grill over there at some
point; perhaps while OP was out of town or making a "honey-dew" run to
the market for the forgotten items from the market or some such...

I'm convinced, too, that it's external. But I still think it's from the stain:
it's right there, right where it would have gotten hit from the overspray that
the OP already said happened -- and it's just about the color I'd expect it to
be, too, from that color stain being sprayed onto that color siding and then
wiped off with some organic solvent.

Look at the OP's first photo again, too -- down at the bottom, just above the
deck, you can see overspray that was *not* wiped off with Lift-Off or whatever
he used. Same color, but no warpage.

and frankly the damage pattern just doesn't have the shape for
that to have been the cause unless it were a misdirected spray gun blast
and the reported application was rubbing w/ a rag instead...

No, he said he sprayed the stain:
....
Yes, but he said he wiped the solvent on manually to clean up the
overspray (and, no, I'm _not_ searching back through the thread to find
it... )...

Right, and that's exactly what caused the damage to be in that pattern. :-)

Only when and if OP actually finishes an investigation and reports back
will anything else possibly be learned...

True enough.

But, being usenet, it certainly can't/won't slow down conjucture,
can/will it?

Not even for half a minute, my friend.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.