On Sat, 28 Jun 2014 19:07:56 +0000 (UTC), HerHusband
wrote:

Micky,

BTW, T1-11 comes in at least two patterns, that is, the widths of the
bands that make up the design.

That's a good recommendation to measure what spacing you have before you
shop for replacements!

I have seen sheets with the grooves every 4" as well as the more common
8" spacing. I've even seen sheets with alternating 4" spacing and 8"
spacing, though it has been a while since I've seen one of those.

I've also noticed variations in texture. Rough sawn seems to mean
different things to different plywood companies. Thankfully, once it's
stained or painted to match, the texture isn't as noticeable unless you
have two different sheets butted up next to each other.

Even when the deign is quite similar, I've seen two different designs.

The original poster will also need to verify the thickness of the plywood
before they buy replacements.

Right. And different thicknesses.

I agree with you, but FTR, my house doesn't have the flashing and
there hasn't been any water damage, probably not even that one sheet
(out of 6 similar ones) mentioned above.

Sometimes the upper sheets on a gable end overlap the lower wall. That
basically serves the same purpose to keep water out of the joint.

Yeah, I checked. They do.

Maybe it has to do with which way the wind blows here or the trees that
might stop the wind at the gable end of the house

If you have decent roof overhangs and the gable isn't real tall, it's

No. The overhang is just the thickness of a 1x6 and he gable varies
from zero to 7 feet tall.

probably sheltered from the majority of the rain. It would only get wet
when rain is blown at the wall and may have time to dry out in between.

It's also possible the joint is caulked?

No.

I'm not saying that z-flashing shouldn't be installed, just that one
should not assume its absence is the problem.

Missing z-flashing is probably not a huge issue, but if no other
explanation can be found it's something to look at.

For sure.

Mine's 35 years old and in good condition except where, during bad
years, I didn't restain it often enough.

We sprayed on our stain the first time (without backbrushing). Since it
mostly just sat on the surface, it only lasted about five years before I
had to restain. The second time around I used a roller to apply the
stain. It took about the same amount of time, but the penetration and
coverage was much nicer. It will be interesting to see if it lasts longer
this time. So far it's not showing any signs of wear.

I used a roller and a long extension the first and only time. I sort
of thought one of my next-door neighbor's would be gung ho siding, and
we'd get the same thing so it matched, like we did with the roof. But
no one has brought it up with any seriousness.

Anthony Watson
www.mountainsoftware.com
www.watsondiy.com