selection & specification guide · 2020-06-25 · al wood products above ground such as...
TRANSCRIPT
Selection & Specification Guide
Preservative Treatments for
Timber & Wood Products in New Zealand
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Tanalised® Wood Products
The Case for Built-In Durability
Wood is a versatile construction material that has many benefits over alternative materials with regard to net environmental impact, cost effectiveness and ease of use. It is the only significant building material whose production and use can result in a net positive carbon storage balance as the wood fibre is created by photosynthesis where growing trees absorb atmospheric carbon dioxide.
Managed plantation forestry is the most sustainable way to produce wood fibre for manufacture of timber and wood products. New Zealand has a strong plantation forestry sector mainly utilis-ing exotic species such as Radiata pine among others. New Zealand also has a modern and efficient wood processing industry to convert this plentiful resource into a wide range of useful building and other products for domestic and export markets.
Durability and reliability in service are the key considerations in determining the suitability of building materials along with good design and construction practices to ensure a resilient and sustainable built environment. In many applications timber and wood products require protection from natural biological agents such as mould, decay and insects. The best way of ensuring the durability of timber and wood products is by industrial pre-treatment incorporating a Lonza pre-servative in accordance with New Zealand, Australian or other recognised standards. Lonza works with leading wood processors and manufacturers in New Zealand and around the world to improve the durability and serviceability of wood products using our chemical and related tech-nologies.
Tanalised® has been the traditional treatment brand in New Zealand for hardworking rural and outdoor wood products since the 1940’s. These days there are many more protection options available from Lonza for the current generation of wood products. Lonza and our customers take pride in ensuring that treated wood and timber products incorporating our chemistry are pro-duced in environmentally compliant facilities, safe to use, fit for purpose and supplied in con-formance with relevant standards.
We hope that you find this guide useful and please feel free contact us for additional information.
Purpose
This document is designed to assist producers, resellers, specifiers and end-users of preserva-
tive treated wood products to better understand the appropriate application of industrial wood
preservatives for various types of wood products and correct selection and specification of pre-
servative treatment for various end-use situations. Industrial wood preservatives from Lonza are
only for use in suitably constructed and authorized industrial wood treatment facilities and are not
available for use by consumers or the end-user.
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Framebor® N is a H1.2 boron based framing
treatment solution using a novel patented bo-
ron formulation which provides significant pro-
cessing improvements compared to most oth-
er boron preservatives.
Our boron formulation and treatment process
results in a minimal moisture content increase
in the treated timber. Because the solution has
a lower conductivity and is less hygroscopic
than some borate formulations, moisture con-
tent readings with conductivity meters is closer
to true MC%. To keep the wood clean during
pre-construction it also incorporates an effec-
tive mouldicide. Ideal for treatment of kiln dried
stress graded timber with low uptake Lowry or
Reuping type treatment processes.
Framebor® N wood preservative is applied
with proprietary pressure and vacuum impreg-
nation processes developed by Lonza to en-
sure that the NZS3640 H1.2 requirements for
preservative penetration and retention are
met.
Uses: H1.2 as per NZS3640 - all interior tim-
ber construction where not directly exposed to
weather —wall framing, sub-floor framing, roof
framing. See NZS3602 for further details.
Timber species: Radiata pine, New Zealand
Douglas fir. Other timber species may be ap-
proved on testing and verification.
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Boron-based Preservatives
Fasteners: The Framebor® treatment itself is
not corrosive to steel. Normal bright steel nails
and connectors are suitable.
H1.2 treatments normally incorporate a red or
pink colouring dye for easy identification of the
treated wood.
Painting: H1.2 treated timber is not normally
painted. If painting is required, use of a stain
blocking primer is recommended to prevent
bleed through of the red colouring dye.
Pre-construction exposure: Boron based
preservatives are not fixed in the timber and
can be leached out under long term exposure
to rain or ground contact. Exposure to weather
prior to and during construction should be min-
imized (<3 months) to ensure compliance with
treatment requirements in the finished struc-
ture. Do not store the timber directly on the
ground. If H1.2 treated timber is exposed for
more than 3 months re-testing of affected sec-
tions may be required by the relevant territorial
authority to ensure that the timber is still com-
pliant.
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Diagrams used courtesy of the Ministry of Busi-
ness, Innovation and Employment. See Building
Code Compliance Document B2 Durability for full
details.
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Specified treatments for timber framing
(Radiata pine or Douglas fir) as per the
New Zealand Building Code.
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Diffusol® is a traditional boron based preserva-
tive intended for application to sawn timber by
pressure treatment or dip diffusion to meet
NZS3640 requirements for hazard class H1.2.
Diffusol® wood preservative may also be used
to treat hardwood timbers to hazard class H1
under AS1604.1. for immunization against
beetle borers. Contact Lonza for further de-
tails.
Uses: H1.2 as per NZS340 - all interior timber
construction where not directly exposed to
weather —wall framing, sub-floor framing, roof
framing. See NZS3602 for further details.
H1 as per AS1604.1 – lyctus borer immuniza-
tion of susceptible hardwoods
Engineered Wood Products
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With the acquisition of Zelam, Lonza is now
able to offer glue line additive treatments
(GLA) for engineered wood products such as
LVL (laminated veneer lumber) and plywood.
GLA treatments have the advantage of incor-
porating the preservatives directly in the glue
used to bond the wood veneers and hence
ensures that the treatment is incorporated in
the wood product from the inside out, not
from the outside in as with conventional treat-
ment.
Timber species: Radiata pine, New Zealand
Douglas fir. Lyctus susceptible hardwoods
such as certain eucalyptus species and
shorea spp (Meranti).
Fasteners: The Diffusol® treatment itself is
not corrosive to steel. Normal bright steel
nails and connectors are suitable
Diffusol® wood preservative can be applied
with dip, spray or pressure treatment process-
es. Lonza can advise on the details of the
various treatment processes and solution
concentrations appropriate for different types
of wood commodities.
Azotek® is the latest addition to this product
family and uses state of the art chemical tech-
nology to provide highly effective protection
against decay fungi and insects to LVL and
related products for use in H1.2 application in
New Zealand. LVL is an important innovation
for New Zealand building offering high
strength and reliable engineering properties
for critical load and large span applications –
and now with the security of Azotek® protec-
tion against decay and insects.
CCA stands for copper, chrome arsenate and
this remarkable wood preservative has been
in use for over 50 years. It has stood the test
of time and even today is still preferred where
timber and wood products require the highest
levels of protection and reliability in demand-
ing situations. CCA wood preservative is still
the longest serving and most widely used
timber treatment in New Zealand, Australia
and many other parts of the world. Even in
cases where CCA preservative has been
withdrawn from some residential applications,
it is often retained for utility, structural and
rural uses where the maximum durability and
engineering safety is essential.
Uses: The unique properties of Tanalith®
CCA preservative make it the ideal choice
where treated wood products must serve in
demanding structural, ground contact or water
contact applications.
H3.2 as per NZ3640 for protection of structur-
al wood products above ground such as deck-
ing, bearers and joists, and similar for H3 as
per AS1604.1.
H4 – for non-structural or non-critical wood
products in ground contact such as fence
posts, garden edges, landscaping sleepers et
cetera.
H5 – critical or structural timber components
in ground or fresh water contact such as
house piles, utility poles and engineered earth
retaining structures.
H6 – marine or brackish water contact such
as wharf piles and similar structures in perma-
nent salt water contact. Note that H6 specifi-
cation for New Zealand application is not
transferable to Australia or other countries.
Timber Species: Tanalith® CCA preservative
is suitable for treatment of common softwood
and hardwood timber products.
Moisture content: Immediately after treat-
ment, CCA treated timber will have a high
moisture content. For H3.2 uses, it should be
specified if the timber is to be supplied wet
after treatment or re-dried (moisture content <
21%).
Fasteners: CCA preservative treatments may
be slightly to mildly corrosive to steel and
other metals in contact with the treated tim-
ber. Galvanized steel or other corrosion
Copper-based Preservatives �
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resistant fasteners are recommended for all
weather exposed or ground contact situations.
Stainless steel fasteners and connectors (or
other metals of high corrosion resistance)
should be used for critical applications where
very long service life is required or where ad-
ditional sources of corrosion are present, such
as salt. The treated wood should not be in-
stalled in direct contact with zinc-alum sheet
roofing as corrosion may result. Use of pre-
painted sheet metal roofing is recommended
and installation of a durable water resistant
membrane between the materials.
Disposal: Tanalith® CCA treated timber off-
cuts and redundant pieces are not a hazard-
ous waste. However it is recommended that
care is taken to dispose of this waste properly
(as a solid waste). It should not be mixed with
green waste for composting and MUST NOT
be used as home heating or cooking fuel as
toxic fumes or residues may be produced.
Use restrictions: The Environmental Risk
Management Authority of New Zealand
(ERMANZ now EPANZ) conducted a review
of CCA preservative in 2003 with extensive
reference to overseas practice and regula-
tions as well as experience of use in New
Zealand. They determined that there was no
specific information indicating that CCA treat-
ed wood posed unacceptable risks for users
and the community in New Zealand where
used as recommended and that no re-
strictions on its use was justified at the time.
However some overseas countries may have
restrictions on the import or use of CCA treat-
ed wood products. Contact Lonza for further
details.
Copper-based Preservatives cont...
Lonza offer a range of copper based preserv-atives for protection of wood and timber prod-ucts in general outdoor and ground contact use. These are environmentally advanced timber preservatives that incorporate copper in combination with azole or quaternary am-monium compound co-biocide wood protec-tion system. The Tanalith® copper based preservatives conform to the latest Unites States EPA, European Union and Australian directives regarding suitable wood preserva-tive products for residential and close human contact use. Copper based preservatives are in wide use around the world including many countries in Europe, the United States and more specifically Japan, New Zealand, Aus-tralia in the Asia Pacific region.
Uses: Tanalith® copper based preservatives are ideal for common above ground (H3 / H3.2) and ground contact (H4, H5) applica-tions that require robust levels of protection but where there may be sensitivity to arsenic or chromium containing preservatives. Exam-ples are outdoor and garden furniture, deck-ing, playground equipment, hand rails and landscaping in schools, public facilities or other areas where high levels of direct human contact are expected.
Timber Species: Tanalith® E and Tanalith® Q preservatives are suitable for treatment of most common softwood and hardwood timbers. Being a dispersion (or suspension) product, Tanalith Eµ preservative is �
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Product Formulation
Tanalith® E preservative
Copper as a solution with azole co-biocide
Tanalith® Eµ preservative
Copper as a micronised dispersion with azole co-biocide
Tanalith® Q preservative
Copper as a solution with quaternary ammonium co-biocide
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recommended for Radiata pine and similar
softwoods only#���
Moisture content: Immediately after treat-ment, the treated timber will have high mois-ture content. For H3.2 uses, it should be specified if the timber is to be supplied wet after treatment or re-dried (moisture content < 21%).
Fasteners: Tanalith® copper based preserva-tive treatments may be slightly to mildly corro-sive to steel and other metals in contact with the treated timber. Galvanized steel or other corrosion resistant fasteners are recommend-ed for all weather exposed or ground contact situations. Stainless steel fasteners and con-nectors (or other metals of high corrosion resistance) should be used for critical applica-tions where very long service life is required or where additional sources of corrosion are present, such as salt. The treated wood should not be installed in direct contact with zinc-alum sheet roofing as corrosion may result. Use of pre-painted roofing is recom-mended and install a durable water resistant membrane between the materials.
Painting: All Tanalith® treated timber (CCA and copper based) can be painted like normal timber once dry and clean. Painting or stain-ing of dimensioned timber in exterior, weather exposed situations is strongly recommended to minimize surface mould, checking, sun bleaching and dimensional movement.
VACSOL® AZURE is a new generation LOSP
(Light Organic Solvent Preservative) treatment
incorporating all carbon based and biode-
gradable triazole and synthetic pyrethroid ac-
tive constituents. Vacsol® Azure wood pre-
servative provides effective protection against
fungal decay and insect attack for above
ground building applications. The key benefit
of LOSP treatment is that it causes no change
in the moisture content or dimensions of the
wood products. Vacsol® Azure preservative is
ideal for protection of high value appearance
and engineered wood products treated in final
shape and form. Typical examples are exteri-
or joinery and mouldings, finger jointed and
laminated timber products and engineered
wood products.
Uses: H3.1 as per NZS3640 – protection of
non-structural wood products exposed to the
weather and which are fully painted. Note that
H3.1 LOSP treatment cannot be substituted
for H1.2 treatment in timber framing for New
Zealand.
Australia - H3 as per AS1604.1 for protection
of general structural and non-structural wood
products above ground.
Timber Species: Radiata pine
Plywood & LVL: Due to the nature of plywood
and LVL it is recommended that additional
conditioning time is allowed for depending
upon drying conditions, the types and thick-
ness of plywood or LVL treated and the
amount of preservative absorbed during treat-
ment.
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Azole-based Preservatives
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Painting: For New Zealand, most H3.1 treat-
ed timber products are supplied with a factory
applied primer coating. All H3.1 treated timber
products should be fully painted where ex-
posed to weather. Timber treated with Vacsol®
Azure preservative is ideal for painting or
staining providing that a few precautions are
taken. Most importantly the timber must be
conditioned for at least 7 days after treatment
before painting to ensure that any excess sol-
vent has flashed off.
In industrial production facilities applying pre-
primer this time may be accelerated by forced
air drying, vacuum drying or other means.
Fasteners: Vacsol® Azure treatment is not
corrosive to steel or other common metals so
no deviation from normal practice is called for.
However corrosion resistant fasteners are
recommended for all exterior or weather ex-
posed timber work.
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Vacsol® Aqua PT is a waterborne, multi-
functional wood preservative system for timber
used above ground containing fungicides
(propiconazole & tebuconazole), insecticides/
termiticides (permethrin and/or imidacloprid)
with optional anti-mould additives and water
repellent agents.
Uses: Under AS1604.1 Vacsol® Aqua PT
treated timber can be used for general out-
door, exposed, above ground situations includ-
ing decking, bearers and joists, fascia, weath-
erboards, plywood cladding, door and window
surrounds, hand rails, laminated posts and
beams, etc. In New Zealand, outdoor uses
include H3.1 which are fully painted and for
non-structural application such as cladding,
fascia and reveals. Section B2 Durability of the
NZ Building Code allows water borne azole
treatment for H1.2 (framing).
Treatment of timber products destined for the
US market can be deemed equivalent to AW-
PA UC3A requirements (close to NZ H3.1) and
possibly UC3B in some cases. Consult Lonza
for further details.
Timber Species: The Vacsol® Aqua PT treat-
ment is intended for kiln dried timber such as
Radiata pine in a conventional vacuum-
pressure plant. Consult with Lonza regarding
the treatment of other timber species.
Azole-based Preservatives cont... �
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Timber to be treated should be kiln dried to
less than 20% moisture content (<16% pref-
erable), be in final shape and form with all
machining completed before treatment and
be free from decay, mould, insect attack and
sapstain. Lonza will advise on the most ap-
propriate treatment schedule for the com-
modities being treated and specifications to
be met. After treatment, timber should be
allowed to air-dry in a well-ventilated area for
at least 48 hours before wrapping or further
processing.
Painting, Gluing & Fixings: Timber treated
with Vacsol® Aqua PT preservative can be
painted with alkyd or acrylic based paints
once dry. All normal wood glues are compati-
ble subject to checking moisture content.
The treated timber is not corrosive to steel,
aluminium or copper alloy fixings. However
corrosion resistant fixings (galvanized steel
as a minimum) is recommended for all timber
in exterior applications.
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Moisture content: Structurally graded timber
(Radiata pine) should be supplied with mois-
ture content less than 21%. Most general out-
door and ground contact treated wood prod-
ucts will be supplied wet (moisture content >
21%). Contact your wood supplier for details.
Reworking after treatment: Treated wood
and timber products should not be re-sawn or
re-sized after treatment by end users (except
for cutting to length or notching as required for
fitting and joining). These processes may re-
duce the protection afforded by the treatment.
Where timber is cut or rebated in H3, H4 and
H5 situations, the exposed area should be
resealed with a suitable ‘in-can’ protective such
as Tanalised® Enseal to ensure that an integral
protection envelope is maintained. In H4 situa-
tions it is recommended not to place a cut end
in ground contact. For H5 applications a cut
end must not be placed in ground or water
contact. No cutting or notching should be done
after treatment on H6 level treated timber in
the water contact zone.
Painting: Painting improves the appearance
and dimensional stability of treated wood and
timber products. It is strongly recommended
that all finished and sawn timber in weather
exposed applications is painted, stained or
sealed to reduce surface deterioration, check-
ing or dimensional movement. Treated timber
can be painted or stained like normal untreated
timber providing that it is dry and clean. Al-
ways follow the paint manufacturer’s instruc-
tions.
Nails, bolts, fixings and metal in contact
with wood: Corrosion resistant fasteners, fix-
ings and connectors should be used for all
timbers in weather exposed, damp or ground
contact applications. See details under each
preservative summary.
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Additional Application Notes
Identification and branding: Tanalised® pro-
tection cannot be applied by the end user or on
site. A conforming Tanalised treatment can only
be provided by pre-treatment in dedicated indus-
trial facilities. All treated wood and timber prod-
ucts should carry a treatment brand that identi-
fies the treatment or hazard level to which the
product has been treated, the preservative used
and the identity of the treatment provider as
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Suitable Applications:
The range of Lonza wood protection products
covers applications in all the hazard levels listed
in NZS3640:2003. It is important to understand
that treated timber and wood products must not
be used in a situation at a higher hazard level
than that for which it was branded. For example,
timber branded for H3.2 application should not
be used in ground contact (H4), and timber
branded H4 is not to be used in an H5 applica-
tion. Note that New Zealand treatment specifica-
tions do not necessarily align 100% with stand-
ards or requirements in other jurisdictions. It is
strongly recommended that specialist advice is
sought prior to specifying treatment for export
markets.
Safety & Environmental Protection
Wood preservatives are generally restricted use
products and require appropriately trained opera-
tors to use and handle the chemicals (Approved
Handlers). Wood preservatives are required to
be registered with the New Zealand Environmen-
tal Protection Authority. Safety Data Sheets
(SDS) and other safe handling information re-
sources are available from Lonza.
Wood preservative processing is a notifiable
activity requiring appropriate trade or site use
consents. Industrial timber treatment plant facili-
ties are required to conform to strict environmen-
tal regulations and are under the jurisdiction of
environmental protection and / or regional au-
thorities.
Treated wood and timber products are safe to
use however as with handling many materials,
certain precautions should be observed, particu-
larly where machining or sanding generates
wood dust and air borne residues. Keep work
areas clean, avoid accumulation or inhalation of
wood dust and wash hands after handling the
materials.
Treated wood wastes and off cuts are generally
not considered to be a hazardous waste. How-
ever, care should be taken to dispose of this
waste appropriately through normal disposal
services. Treated timber wastes should not be
mixed with general green waste for composting.
Treated timber should not be burnt in uncon-
trolled situations such as for cooking or home
heating.
Further Information
For further sources of information contact the NZ
Timber Preservation Council. This information is
presented in good faith and is believed to be
accurate, based on the best available advice and
knowledge at the time of printing. However due
to the variability of application situations, the user
must satisfy themselves as to the suitability of
the information or the products for any particular
purpose or circumstance or take suitable expert
professional advice.
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NZS 3640 Chemical Preservation of Round and Sawn Timber covers treatment re-quirements for treatment of round and sawn timber.
NZS 3602 Timber and Wood-based Products for Use in Building
NZS 3604 Timber Framed Buildings
New Zealand
Building Code
Also see Clauses B2 Durability and E2 External Moisture of the New Zea-land Building Code for latest acceptable solutions which may not be reflect-ed in current standards.
AS/NZS 1604.2- 5 AS/NZS 1604 parts 2 to 5 cover requirements for treatment of composite, laminated and veneer based wood products.
RELEVANT STANDARDS
The following are examples of national and joint standards which are directly relevant to preserv-
ative treated wood products. Other standards may apply or be called on by these standards.
HAZARD LEVELS & APPLICATIONS
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Summary of Lonza Wood Preservatives for Key Applications as per NZS3640 Treatment (Hazard) Levels
Hazard
Level
Exposure and
Service Hazards
Specific Application
Examples
Minimum Retention Levels
(see NZS3640 for full de-
tails)
Conforming pre-
servative (and
number (1))
H1.2 Framing and interior
construction timber not
in direct weather expo-
sure (see NZS 3602).
0.40% m/m BAE (2)
0.08% m/m azoles(3)
Framebor® N (11)
Diffusol® (11)
Vacsol® Aqua PT(64)
LVL for H1.2 Triadimefon + cypriconazole(7) Azotek® (66)
H3.1 Outdoors, exposed
to the weather,
above ground
Exterior non-structural
building components,
cladding fascia, joinery
– see NZS3602
0.06% m/m azoles (3)
Vacsol® Azure (64)
Vacsol® Aqua PT
(64)
H3.2 Outdoors, exposed
to the weather,
above ground, or
with a risk of mois-
ture entrapment
All H3.1 uses, plus
outdoor structural appli-
cations and decking –
see NZS3602
0.23% m/m copper + azole (4)
0.35% m/m copper + DDAC (5)
0.37% CCA elements (6)
Tanalith® E (58) or
Tanalith® Eµ (88)
Tanalith® Q (90)
Tanalith® CCA (01)
H4 Exposed to the
weather, in ground
contact
Non-structural or non-
critical timber in ground
contact - fence posts,
landscaping timbers
0.42% m/m copper + azole (4)
1.02% m/m copper + DDAC (5)
0.72% m/m CCA elements (6)
Tanalith® E (58) or
Tanalith® Eµ (88)
Tanalith® Q (90)
Tanalith® CCA (01)
H5 Exposed to the
weather, in ground
or fresh water con-
tact
House piles and poles.
Crib walling or other
engineered earth re-
taining structures
0.76% m/m copper + azole (4)
1.35% m/m copper + DDAC (5)
0.95% m/m CCA elements (6)
Tanalith® E (58) or
Tanalith® Eµ (88)
Tanalith® Q (90)
Tanalith® CCA (01)
H6 Marine or brackish
water exposure.
Marine borer
hazard
Marine piles, jetty cross
-bracing, landing steps,
sea walls
0.40% m/m copper (as Cu
only)
Tanalith® CCA (01)
Interior, protected
from the weather,
but with the possi-
bility of exposure
to moisture.
(1) Every recognised preservative type has a number assigned for identification. See NZS3640 sections 4
and 5 for details of preservative specifications and identification numbers.
(2) BAE stands for Boric Acid Equivalent (H3BO3).
(3) Azoles as combined retention of propiconazole + tebuconazole. This treatment also includes an insecti-
cide where there is a termite or wood borer hazard.
(4) Azole as tebuconazole alone or as tebuconazole + propiconazole (1:1 ratio)
(5) DDAC is didecyl-dimethyl ammonium chloride or carbonate
(6) The term CCA elements means the total of copper (Cu) plus chromium (Cr) plus arsenic (As) elements.
(7) As glue line additive + face veneer application – see NZS3640.
The information contained herein is believed to be correct and corresponds to the latest state of scientific and technical
knowledge. However no warranty is made, either expressed or implied, regarding its accuracy or the results to be obtained
from the use of such information. Some products may not be available in all markets or for every type of application. Any
user must make their own determination and satisfy themselves that the products supplied by Lonza and the information
and recommendations given by Lonza are (i) suitable for intended process and purpose, (ii) in compliance with environmen-
tal, health and safety regulations, and (iii) will not infringe any third party’s intellectual property rights. © Lonza 2015
All copyrighted material has been reproduced with permission from their respective owners, all other materials ©2016 Lon-
za. Tanalith, Framebor, Vacsol, Diffusol, Azure Aqua, Azotek, Enseal and Tanalised are trademarks of Lonza Group or its
affiliates.
October 2016
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Arch Wood Protection (NZ) Ltd
A Lonza company
265 James Fletcher Drive Otahuhu
Auckland New Zealand
Tel: 09 276 3646 Fax: 09 270 2020
Email: [email protected]
www.lonzawoodprotection.com