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Posted by BobK207 on June 1, 2007, 11:19 pm
>
>
>
>
> > > I have used opaque latex stains on decks. Works fine. I have also
> > > <gasp> painted PT stock with latex paint. In both cases, the wood had
> > > weathered for about a year. Don't know if that makes a difference.
>
> > Most PT lumber comes pretty wet from the supplier. ?Paint goes best on
> > dry wood, un-weathered wood (best adhesion)
>
> > so what you got is conflicting ?requirements......PT comes weather,
> > allowing to "weather" (really alllowing it to dry) gives better
> > adhesion than wet timber, weathering (UV exposure) degrades surface
> > wood fibers (reduces adhesion)
>
> > Best of all worlds....dry PT stock but good luck finding it ? :(
>
> > Or you could just install wet & let dry...since your porch is covered,
> > depending on exposure, you might not get much UV exposure.
>
> > cheers
> > Bob
>
> PT wood even stained expands and contracts way too much. After a
> couple years it will look HORRIBLE. PT does all sorts of wierd stuff
> l;ike barber poll. The treatment makes it much more likely to expand
> and contract
>
> Have a family friend who replaced their deck this year because their
> dad painted the PT wood. the wood was good physically but appearance
> YUK.
>
> Solid stain is a much better choice.
>
> Its my strong belief one day PT will be treated like asbestos with
> guys in moon suits taking it away along with the soil under the deck
>
> presently kids shouldnt get under PT wood because the dirt is
> contaminated with chemicals.
HB-
Please explain
......The treatment makes it much more likely to expand
and contract ..............
PT treatment can change fundamental behavior of the wood?
Don't get me wrong.....I'm not a fan of PT but my experiment with PT
has been that PT'd DougFir is dimensionally stable but the more
typical HemFir that ships nearly dripping wet, twists & bows as it
dries.
Treaters prefer the HemFir because it treats quicker (at least that's
what I was told)
When used as mud sill & anchored in place it tends to behave itself
OP-
We used to stack & sticker green framing timber (2x's & 4s's) put a
cluster of 20" box fans on the end of the stack & blow air though it
24/7 for a couple weeks to get the moisture content down near 12%
This was indoors in SoCal....YMMV depending on local weather.
PT'd HemFir would really dry qucikly but I's hate to see the resulting
bows & twists. We ordered about 20% extra on our framing materail so
we could dump the un-usable ones.
cheers
Bob
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