This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

cheers,
cd.

On 11/11/2014 11:23, Cursitor Doom wrote:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

cheers,
cd.

The treated wood I buy from my local timber merchants (Stoke on Trent)
is pressure treated. I still have sound wood that has been out in the
garden for over 12 years, it looks just as you describe.

On Tuesday, 11 November 2014 11:23:39 UTC, Cursitor Doom wrote:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?


It's pressure treated so the outer ~5mm are pretty rot-proof (and the remainder
is protected because the outer 5mm prevents any oxygen getting in).

However if you cut the outside away, the remainder can be vulnerable, so you
should soak it well in preservative.

"Cursitor Doom" wrote in message
...
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?


There are two methods of treatment dipping and pressure treatment.
Fence panels etc are usually dipped as the timber is thin.
The pressure treated goes in an autoclave, vaccuum is drawn and the
trreatment sprayed on.
Peneration depends on howmuch of a vacuum is pulled.
I watched one that seemed pretty dodgy to me.

The green is just dye to show it has been treated.
Peneration seems very variable to me.
You are supposed to treat cut ends.

At one time the treatment was with copper and arsenic salts.
Chromium now I think. Not as good as the previous stuff.

"Cursitor Doom" wrote in message ...

This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

cheers,
cd.

I rejected a batch destined for my roof a couple of years ago as it was
obvious they had been dunked in a tank while still banded together. The
inner faces of the inner timbers in the bundle weren't even green on the
outside never mind any penetration !

Andrew

"Andrew Mawson" wrote in message
...
"Cursitor Doom" wrote in message ...

This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

cheers,
cd.

I rejected a batch destined for my roof a couple of years ago as it was
obvious they had been dunked in a tank while still banded together. The
inner faces of the inner timbers in the bundle weren't even green on the
outside never mind any penetration !

Andrew

Now that wouldn't surprise me.

In article ,
Cursitor Doom writes:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my
28 year old featherboarded arris rail fence is still fine, and I
never treated it with anything, and it wasn't pre-treated timber.
Providing timber gets a chance to dry out from time to time, it
doesn't rot very fast at all.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 11/11/2014 18:21, Andrew Gabriel wrote:
In article ,
Cursitor Doom writes:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my
28 year old featherboarded arris rail fence is still fine, and I
never treated it with anything, and it wasn't pre-treated timber.
Providing timber gets a chance to dry out from time to time, it
doesn't rot very fast at all.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.


Roofing battens have such a high moisture content it's difficult to see
how there would be room for any preservative. At least twice the weight
of joinery quality IME

On 11/11/2014 20:18, stuart noble wrote:
On 11/11/2014 18:21, Andrew Gabriel wrote:
In article ,
Cursitor Doom writes:


Roofing battens have such a high moisture content it's difficult to see
how there would be room for any preservative. At least twice the weight
of joinery quality IME

Isn't that because when you buy them they have not dried out from the
pressure treatment which might only be a few weeks old?

"Andrew Gabriel" wrote in message
...
In article ,
Cursitor Doom writes:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few
mms?

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my
28 year old featherboarded arris rail fence is still fine, and I
never treated it with anything, and it wasn't pre-treated timber.
Providing timber gets a chance to dry out from time to time, it
doesn't rot very fast at all.

And some timber doesn't rot much at all even when its wet
all the time, most obviously with that is used for timber jettys.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.

On Tue, 11 Nov 2014 18:21:42 +0000, Andrew Gabriel wrote:

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my 28
year old featherboarded arris rail fence is still fine, and I never
treated it with anything, and it wasn't pre-treated timber. Providing
timber gets a chance to dry out from time to time, it doesn't rot very
fast at all.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.

True. Any product that was really effective at anything has been banned,
it seems. I'm guessing creosote (the stuff we used back in the day) went
the same way as I haven't seen that around for a long, long time now.

On Tuesday, November 11, 2014 11:26:45 PM UTC, Cursitor Doom wrote:
On Tue, 11 Nov 2014 18:21:42 +0000, Andrew Gabriel wrote:

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my 28
year old featherboarded arris rail fence is still fine, and I never
treated it with anything, and it wasn't pre-treated timber. Providing
timber gets a chance to dry out from time to time, it doesn't rot very
fast at all.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.

True. Any product that was really effective at anything has been banned,
it seems. I'm guessing creosote (the stuff we used back in the day) went
the same way as I haven't seen that around for a long, long time now.

Yep. Its easy to make - we need a ukdiy creosote still design.


NT

On Tuesday, November 11, 2014 11:26:45 PM UTC, Cursitor Doom wrote:
On Tue, 11 Nov 2014 18:21:42 +0000, Andrew Gabriel wrote:

The treatments allowed to be applied were seriously dumbed down some
years back. Outdoor garden timber - the treatment now is pretty much
completely useless. OTOH, I do question if it was ever needed - my 28
year old featherboarded arris rail fence is still fine, and I never
treated it with anything, and it wasn't pre-treated timber. Providing
timber gets a chance to dry out from time to time, it doesn't rot very
fast at all.

The only timber which was still allowed to be pre-treated with anything
nasty enough to really work was roofing battens. Don't know if that's
still allowed today.

True. Any product that was really effective at anything has been banned,
it seems. I'm guessing creosote (the stuff we used back in the day) went
the same way as I haven't seen that around for a long, long time now.

(Real) Creosote is still available to the 'professionals' which around here seems to mean the ability to buy it in 25l quantities