Download High Pressure Treated Timber User Guide

Preparation
of of
timber
prior
toto
treatment
Preparation
timber
prior
treatment
1) 1)Timber
packs
must
be be
of the
correct
moisture
content
in order
to to
allow
sufficient
penetration
intointo
thethe
wood
fibre.
Timber
packs
must
of the
correct
moisture
content
in order
allow
sufficient
penetration
wood
fibre.
Below
28%
moisture
content
is the
recommendation.
Below
28%
moisture
content
is the
recommendation.
2) 2)Timber
must
be be
debarked
and,
as far
as possible,
freefree
from
sawdust
andand
debris.
Plastic
wrapping
should
be be
removed.
Timber
must
debarked
and,
as far
as possible,
from
sawdust
debris.
Plastic
wrapping
should
removed.
Packs
thatthat
have
been
very
tightly
banded
should
have
thethe
bands
cutcut
prior
to to
treatment
to to
allow
freefree
passage
of the
Packs
have
been
very
tightly
banded
should
have
bands
prior
treatment
allow
passage
of the
fluid
into
the
packs.
fluid into the packs.
3) 3)All All
possible
working
of the
timber
should
be be
performed
prior
to to
treatment
possible
working
of the
timber
should
performed
prior
treatment
4) 4)If timber
shows
signs
of incipient
attack
from
fungus
or or
insects
it should
notnot
be be
treated.
If timber
shows
signs
of incipient
attack
from
fungus
insects
it should
treated.
5) 5)A small
amount
of blue-stain
is not
critical.
A small
amount
of blue-stain
is not
critical.
6) 6)
Where
possible,
space
thethe
packs
with
laths
in order
to to
allow
freefree
passage
of of
thethe
fluid
andand
to to
aidaid
thethe
drying
Where
possible,
space
packs
with
laths
in order
allow
passage
fluid
drying
process
afterwards.
process
afterwards.
The
Treatment
Process
The
Treatment
Process
11
The The
timber
is is
timber
transferred
into into
the the
transferred
treatment
vessel.
treatment
vessel.
22
33
44
55
66
A vacuum
pullspulls
the the
Osmose
Naturewood
vessel
is pressurised
solution
is removed
timber
has has
nownow
beenbeen
A vacuum
Osmose
Naturewood The The
vessel
is pressurisedThe The
solution
is removed The The
timber
air out
fills fills
the vessel.
the solution
into into and and
finalfinal
vacuum
is is
treated
withwith
Osmose
air of
outthe
of vessel.
the vessel. solution
solution
the vessel. forcing
forcing
the solution
vacuum
treated
Osmose
the timber.
applied
removing
excess.
solution.
the timber.
applied
removing
excess. Naturewood
Naturewood
solution.
Collection of treated timber
Treated timber should always be allowed to dry sufficiently before it is despatched. In general a period of not less than 24
hours should elapse. This is typically a minimum requirement and timber packs should be touch dry with no free fluid in the
packs at all. It should be remembered that timber will also swell to some extent during treatment and should be allowed to
dry at a natural rate until it has reached its pre-treatment moisture content.
Re-working of treated timber
Occasionally it may be necessary to re-work treated timber. Every effort must be made to avoid this but if it must be
done the following should be observed.
1) Any surface exposed by drilling or cutting must be coated with a cut end preservative. Failure to coat will undermine the
effectiveness of the preservative. It is recommended that the coated ends are not put in the ground or in direct contact with water.
Rip sawing, thicknessing and planing are not permitted unless the timber is subsequently processed to the original specification.
2) Never place a re-treated end in ground contact.
4) Where any working is carried out, read and follow the health and safety instructions in the Health and Safety section
of this guide.
Gluing
Osmose Naturewood preserved wood can be glued with most commonly used adhesives once dry. Always follow the
adhesive manufacturer’s recommendations.
Which metal fixings can I use?
Certain metal products (including fasteners, hardware and flashing) may corrode when in direct contact with wood treated
with copper based preservatives. To prevent premature corrosion and failure it is important to follow the recommendations of
the manufacturer for all metal products. Do not use preserved wood in direct contact with aluminium.
Appearance of Osmose Naturewood
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Sales
&
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- Accounts
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Osmose Naturewood products will initially have a green appearance that highlightsT:
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variations
of the wood; this will - Accounts
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- Cumbernauld,
Lanarkshire
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Cumbernauld,
Lanarkshire
720992
Lanarkshire
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Cumbernauld,
Lanarkshire
weather to an attractive natural honey brown colour before finally fading to a driftwood grey after long term exposure to the sun.
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- Boston,
Lincolnshire
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Lincolnshire
355669
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Lincolnshire
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Lincolnshire
Osmose Naturewood products can be stained to match any outdoor
colour
scheme.
Always follow manufacturer’s
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Hull,
East
Yorkshire
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recommendations.
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Tilbury,
Essex
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Tilbury,
Essex
Osmose Naturewood®-treated timber is also available with a brown colour. As with the natural green colouration of
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Tayside
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Rosyth,
Fife
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Rosyth,
Fife
treated timber, the brown colour will fade after a period of time. The rate of fading will depend on the end use application
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Brighton,
East
Sussex
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Sussex
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- Perth,
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www.ptgtreatments.co.uk
and environmental conditions.
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- Brighton,
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Sussex
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