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Jack

On 11/8/2016 8:54 PM, wrote:
On Tue, 8 Nov 2016 09:07:53 -0500, Jack wrote:

OSB used for roofs must have some awesome glue, impervious to water,
bugs, mold, etc. No living thing seems to eat it, that stuff holds up
quite well. I know from experience. Some here are trashing it (Kevin),
which really surprises me. I guess they never used it and are out to
lunch on this one. When I first noticed it used in homes, I was
surprised. Now I know why it's used. Probably not good for ground
contact, but not much is, other than pressure treated stuff with a high
poison to wood ratio:-)

There is OSB, and then there is OSB. Some of it has such a high
resin content it stands up well to moisture - and even soaking. The
rest swells like crazy when it get set, and falls apart like wet
newpaper as soon as it gets wet. Lots of shed kits made of the latter
were sold a few years back - siding was not included but was required
according to the plans. Many never got siding or even a coat of paint,
and they just disintegrated in about 2 or 3 years.. A lot of that
cheap "aspenite" was also used for subfloors, and a water leak
anywhere caused the stuff to give way.

I know the early particle board was no good for damp conditions.
Neither is indoor plywood. The OSB used for roofing is extremely
durable. I don't think this stuff is special either. The Cat houses I
made were made with container boxes used to ship clothes. It was in the
early 90's that I saw it used on cabins for siding, unfinished. I asked
the guy that built one, who was a carpenter by profession, how he
expected it to hold up outside, as I was thinking like some of you that
it was junk, and would fall apart when wet. Well, it never did, and
neither did the cat houses I built.

When krw said, and I quote:

"OSB is often used on walls, with CDX corners, but anyone who uses it on
roofs should be taken out and shot."

Well, it shows he is clueless, and someone besides the builders using it
should be "taken out and shot". Virtually ALL roofs are sheathed with
this stuff around here, and I suspect the rest of the country is the same.

--
Jack
Add Life to your Days not Days to your Life.
http://jbstein.com