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Posted by John Richards on August 4, 2005, 6:00 pm
I don't remember where I read it but I recall reading a recommendation to
"seal" the ends of pressure treated lumber when used as railing caps. I
don't know if they were talking about something like Thomson water seal or
something meant specifically for end grain. Any comments?
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Posted by on August 4, 2005, 12:18 pm
End grain absorbs water faster than other surfaces.
Pressure treatment protects outer regions of a piece of wood more than
inner.
To protect the ends of siding, trim and other wood exposed to weather I
sometimes use epoxy, or paint. It's tedious and most contractors won't
do it even when I pay for it
Howver, I worked with Glen Salsman of Mt. Pleasant South Carolina to do
trim in the basement. Within weeks, I had repeated sewer backups and
the protected endgrain came through without damage.
TB
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Posted by Roger Taylor on August 4, 2005, 12:42 pm
>I don't remember where I read it but I recall reading a recommendation to
>"seal" the ends of pressure treated lumber when used as railing caps. I
>don't know if they were talking about something like Thomson water seal or
>something meant specifically for end grain. Any comments?
PT wood has good weather resistance but once cut, you will see that the
chemicals penetrate only a quarter inch or so, so painting the end pieces,
once they are cut, wouldnt be a bad idea, I suppose. You could use Copper
Green preservative in a spray can, or brush it on if you want to buy the
can.. I would avoid Thomson, as it is a poor choice, and is a weather
coating and (a very poor) water repellant, not a preservative...
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Posted by on August 4, 2005, 1:46 pm
To do much good, I think the end grain has to be penetrated and filled.
A spray would not, in my opinion, put enouth material into the end
grain to do much good.
TB
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Posted by Roger Taylor on August 4, 2005, 2:35 pm
> To do much good, I think the end grain has to be penetrated and filled.
> A spray would not, in my opinion, put enouth material into the end
> grain to do much good.
> TB
OK, dip the ends and let them soak overnight!
Whether you use Copper Green spray, or liquid in a can, or their equivalents
in other brands, it is the least viscous coating I can imagine. It has the
"soakability" of paint thinner or kerosene, both being pretty good
penetrants. It is purely a penetrant, not a coating.
Agreed, not much of anything will soak into PT wood, but sawn endgrain is
highly absorptive. No how many brushfulls of copper green I put on my new pt
2x4 fence framing, the end pieces kept begging for more, so it must have
soaked in pretty well.
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