PRODUCT CATALOGUE AND QUALITY SPECIFICATION
SLP-THERMOWOOD®
Helsinki
We combine Finnish wood, natural appearance
and ecological thinking. As a result we offer
durable and valuable wood products.
Suomen Lämpöpuu - SLP
SLP-THERMOWOOD® EXTERIOR CLADDING AND OUTDOOR
CONSTRUCTION PRODUCTS
SLP-THERMOWOOD® WARMCLAD
Decay- and weather resistance are important characteristics for a cladding board. WarmClad
is an excellent choice for exterior cladding. Its decay resistance class is I-II and its usable life is
many times greater than that of untreated wood. WarmClad’s moisture content is half that of
normal wood and surface splitting caused by UV-radiation will be less than with normal wood.
WarmClad is also available with oil surface treatment which helps to keep the beautiful brown
color. Without treatment the surface of thermally treated wood will turn grey due to UV-radiation.
SUOMEN LÄMPÖPUU OY - THERMOWOOD® FROM FINLAND
PIONEER
Suomen Lämpöpuu – SLP Oy is one of the pioneers in the world for producing thermo-treated
wood products. SLP was founded by a group of local entrepreneurs in 1999. SLP is one of the
founding members of the International ThermoWood Association. Experience has refined our
skills and know-how for producing high-quality ThermoWood®.
Channel-siding smooth
V-siding smooth
Bevel-siding roughened
Finno-siding roughened
Our main product groups are for exterior cladding and terrace construction. Over 90 % of our
production goes to export. We ship ThermoWood® products throughout Europe as well as to
other continents.
“We believe in the excellent features of thermo-treated SLP
products and we want to offer our customers quality products,
in which are combined good durability and ecology. We have
developed the thermal treatment process by combining technology
and our own know-how which is based on knowledge and
experience.”
SLP-THERMOWOOD® VIVAXCOLOR
VivaxColor is a quality and easy-to-use choice for exterior cladding. It features all the good
characteristics provided by thermal treatment: it has excellent characteristics for decay resistance,
weather resistance and thermal insulation. For the user VivaxColor is an easy and worry-free
product: it is ready for immediate installation. We trust in the fine characteristics the process
provides in the wood and offer a 30 year guarantee against decay as well as a 10 year guarantee
for the paint surface.
FOR OUTDOOR CONSTRUCTION WE OFFER ALSO BATTENS,
PARALLELOGRAMS AND TRAPEZIUMS.
Name
Dimensions
Length (m)
Surface treatment
Batten
42x42
3,9 – 5,1
Option
Batten
42x68
3,9 – 5,1
Option
Parallelogram
26x54/68
3,9 – 5,1
Option
Trapezium
29/42x42
3,9 – 5,1
Option
VivaxColor basic colour selection: Black (RAL9005), White (RAL9001), Grey (RAL7016), Red
(RAL3009), Green (RAL6009). Other colours available by order.
Bevel-siding
Batten 42x42
Batten 42x68
Trapezium
Parallelogram
Finno-siding
PRODUCT INFORMATION
Profile
Name
Dimensions
Consumption (m/m2)
Length (m)
Surface treatment
Channel-siding
smooth/
roughened
18x118
18x140
18x185
8,5
7,6
5,4
1,8 – 5,4
Oiled
V-siding
smooth/
roughened
18x118
18x140
18x185
8,5
7,6
5,4
1,8 – 5,4
Oiled
Bevel-siding
smooth/
roughened
18x118
18x140
18x185
8,5
7,6
5,4
1,8 – 5,4
Oiled, VivaxColor
Finno-siding
smooth/
roughened
18x118
18x140
18x185
8,5
7,6
5,4
1,8 – 5,4
Oiled, VivaxColor
PRODUCT INFORMATION
Profile
Name
Dimensions
Consumption (m/m2)
Length (m)
Surface treatment
Concealed fastening
Classic
26x118
26x140
26x185
8,5
7,6
5,4
1,8 – 5,4
Option
-
Elegant
26x118
26x140
26x185
8,5
7,6
5,4
1,8 – 5,4
Option
-
Elegant
side-grooved
26x118
26x140
26x185
8,5
7,6
5,4
1,8 – 5,4
Option
yes
SLP-THERMOWOOD® TERRACE CONSTRUCTION PRODUCTS
SLP-THERMOWOOD® WARMDECK
WarmDeck decking boards, made from ThermoWood®, combine excellent durability and a
stylish appearance. Durability is one of the most important characteristics of a decking product.
Thermal treatment provides the wood with an excellent biological durability, its decay resistance
class is I-II and its usable life is many times greater than that of untreated wood. WarmDeck’s
moisture content is half that of normal wood and surface splitting caused by UV-radiation will be
less than with normal wood.
Classic
Elegant
Elegant side-grooved
Concealed fastening system
We recommend surface treatment of decking boards.
Without treatment the surface of thermally treated
wood will turn grey due to UV-radiation. First layer
of surface treatment can also be applied in
our factory. Our concealed fastening system
creates a stylish and finished appearance.
In addition to decking boards, we offer other
thermally treated products for building fences
and other garden structures.
SLP-THERMOWOOD® QUALITY PRINCIPLES
GENERAL DESCRIPTION OF RAW MATERIAL QUALITY
We use Finnish pine and spruce as our primary raw materials. Thermal treatment places high
demands on the raw material, which means only the best parts of the wood are suitable for
the process. We use Nordic timber grade AB timber, and only heartwood from 2 ex center cuts.
Although we use high-quality coniferous wood, wood is a natural material and it is not of consistent
quality or uniform appearance throughout. Many factors affect the variability of the timber quality,
such as the tree’s growth conditions and age. Nordic conifers also have branches, but we try to
use only heartwood from the upper limbs, to maximize the portion of sound knots. (Quality AB,
heart wood according to “Nordic Timber – grading rules” www.stmy.fi/en/publications)
PLANING
We use a powerful modern plane that has been optimized for use with ThermoWood®. Planing
thermo-treated wood differs from planing ordinary timber, but experience has taught us how to
handle ThermoWood® the most appropriate way. Different profiles place their own demands on
working with thermally treated wood. Thin profiles split more easily than thicker ones, and the
deeper the planing, the more likely cracks will appear. Long experience has helped us develop
the profiles most suitable for thermally treated wood.
Our products are quality-graded according to the following principles:
Grading is done by visually inspecting the board’s
appearance. The product’s profile, intended use, and
size affect its final classification. Typically 1,5 - 10 %
of a production batch is discarded.
In appraising the timber we evaluate its natural
properties as well as the technical characteristics
arising from the treatment process. These
include the size, number and placement of
knots, as well as checks, wane, pitch pockets,
bark pockets, deformations and color.
All sides are inspected separately. The grade is
assigned based primarily on the intended use of the
board and visual assessment of both its faces.
QUALITY DESCRIPTION
Quality:
SLP-ThermoWood Thermo-D
Raw material:
Pine (Pinus Sylvestris), Spruce (Picea Abies)
Quality of the raw material:
Nordic timber quality AB heart wood
Surface:
Planed
Installation:
Decking, External Cladding
Moisture:
4 – 6 % after production
Tolerances:
INTERNAL QUALITY ASSURANCE
Our products are manufactured under the framework established by a
Bureau Veritas Certification quality management system conforming to
ISO 9001 (Bureau Veritas Certification Certificate No: FIHSK8593185A).
Management responsibility, resource management, process management
and assessment, analysis and continuous improvement are among
the fundamentals included in the ISO 9001 standard. Products are
manufactured in accordance with ThermoWood® product specification TR
31. Finotrol conducts annual audits of the manufacturing process (www.
finotrol.fi).
Finotrol monitors as an outside auditor SLP’s management of the chain
of origin for raw materials and the quality of its production. As certification
of these, the Finnish Forest Certification System has granted SLP the right
to use the PEFC certification of origin and the International ThermoWood
Association has granted the right to use the ThermoWood (TMW) quality
trademark.
The quality of our products is ensured by conducting and monitoring
the production and manufacturing process in accordance with
the certification and specifications. The quality of each individual product is ensured by
recording data from each phase of the process during manufacturing. We know the raw
material’s supplier, moisture content and quality. For the thermal treatment process,
we record data about the material being treated along with data about the process
itself and its course. Samples are also taken in order to monitor the quality uniformity.
Width:
+/- 1 %
Thickness:
+/- 0,50 mm
Length:
- 10 mm, + 30 mm
PRODUCT QUALITY SPECIFICATIONS
Surface
Planed or unplaned.
Checks
Occasional hairline checks are allowed as long as they do not extend through the board. At the
ends of boards, a short through check is allowed.
Insect damage
Not allowed.
Scars and bark pockets
Not allowed.
Decay
Not allowed.
Compression wood
Permitted only as long as it does not significantly interfere with attaching the cladding boards.
Knots with chunks missing
Occasional ones are allowed.
Knotholes
Small knotholes are allowed. Large knotholes (over 10 mm) that substantially interfere with
attaching or using the product are not allowed if several such holes are found in an inspected
board.
Knots
Knots of different sizes are allowed. Most of them should be tight. Knots are allowed in
accordance with the Nordic timber grading rules.
Pitch pockets
Small pitch pockets that do not go all the way through are allowed.
Heartwood strip
A heartwood strip the size of the whole board is allowed.
Color
Thermally treated wood may exhibit slight variations in color that result from the natural
properties of the timber.
The chart lists the maximum size and number of flaws in a 1-meter section. Multiple irregularities
are allowed as long as the general appearance of the board is of sufficient quality.
Quality principles cover 95 % of the delivered products.
ILLUSTRATED SUMMARY OF TYPICAL NATURAL PROPERTIES OF WOOD
WHICH MAY APPEAR IN OUR PRODUCTS.
Small cracks on the surface of
the board are allowed.
A short through check at the end of a
board is allowed.
Heartwood strip is allowed.
TR 31 PRODUCTION AND QUALITY REQUIREMENTS FOR
THERMOWOOD PRODUCTS:
Softwood
Requirement/Property
Thermo-D
Treatment temperature °C (wood)
212 +/- 3
Treatment time (h)
2–3
Final moisture content, average
moisture content %
4–7
Equilibrium moisture content %
A small loose knot on the edge
of the board is allowed.
Small cracks may be visible in the knots.
A small knothole through the board
is allowed.
T = 20°C, RH 65%
4–6
Color, L° component
42 – 55
Surface checks, check length %
thickness of piece (mm)
16 – 31
32 – 50
51 – 75
< 15
< 25
< 35
Internal checks, check %,
thickness of piece (mm)
16 – 31 32 – 50
51 – 75
<5
< 10
< 15
Distortions
Pitch pockets are allowed
Occasional cracks in knots are allowed.
Occasional cracks in knots are
allowed.
Bow (mm per 2m length)
< 10
Spring (mm per 2m length)
<4
Cupping (% of width)
<2
Twist (% of width)
<6
Horontie 166
FI-64700 Teuva
Finland
tel. +358 6 2672 541
info@suomenlampopuu.com
www.suomenlampopuu.com
Suomen Lämpöpuu