Passion for Timber

CLT – Cross laminated timber

Key technical data

Sawn timber experts out of tradition. Since 1948, the beginning of the company, Pfeifer is a reliable supplier of high quality sawn timber.

Nowadays the Pfeifer Group is one of the 3 top producers in Central Europe thanks to a yearly production capacity of 2,1 millions m³ sawn timber. In six sites in Austria, Germany and Czech Republic we produce the best out of each tree trunk thanks to the video editing optimization on every saw line. In our warehouses, sawn timber in various dimensions and planed goods are always in stock to be optimally used by our customers in the short term.

Technical data

standard structures

Surface qualities

Basic panel structure

CLT explained

Further explanations on the principle and layout of a CLT board can be found here.

Product designationPFEIFER CLT cross laminated timber
ApplicationApproval: 20/0023
Bearing and non-bearing building elements in buildings and wood constructions such as walls, ceilings and roofs
Utilisation classService classes 1 and 2 (according to EN 1995)
Panel structure3 to max. 15 cross-laminated plies
Ply variationMax. 3 plies with the same fibre orientation (≤ 90 mm) possible
Panel lengthup to 14.50 m
Panel widthup to 3.10 m
Panel thickness60 - 280 mm (Standard), up to 320 mm upon request
Lamella thickness20, 30 or 40 mm
Raw product strength gradeC24; max. 10 % C16 partially permissible (Acc. to EN 338)
Surface finishIndustrial quality (IQ), industrial visible quality (ISQ) and residential visible quality (WSQ)
Types of woodEuropean Softwood, PEFC-certified
Wood humidity12 ± 2 % (at time of dispatch)
Dimensional stability
  • Longitudinally and crosswise on panel plane: 0.01 % per % change in moisture content
  • At a right angle to panel plane: 0.20 % per % change in moisture content
GluePolyurethane (PU) glue (formaldehyde-free) for finger-jointing and face gluing (acc. to EN 301 or EN 15425)
WeightApprox. 480 kg/mÑ (to determine transport weight)
Diffusion resistanceμ = approx. 60 (at u = 12 ± 2 %)
Air tightnessClass 4 (acc. to EN 12207) Airtight from 3 plies acc. to report HFA dated 29.11.2019
Thermal conductivityλ = 0.12 W/(m.K.)
Specific thermal capacitycp = 1600 J/(kg.K)
Fire performanceD, s2, d0 (according to EN 13501)
Fire resistance / burn rate~ 0.7 mm/min. (for estimation computations)
RecyclingWaste code: 17 02 01 (acc. to AVV)

The orientation principle

PFEIFER CLT relies on standardisation

The fibre orientation of the outermost ply is the bearing direction. Thanks to the use of dual plies, meaning top plies whose fibre orientation is the same (ss), the longitudinal or cross-stiffness or load bearing capacity of the panel can be increased on purpose. This purposeful change in the panel structure also increases its fire resistance. In case of special requirements towards appearance, changes in the structure can yield uniform visuals. PFEIFER CLT can theoretically be manufactured with up to 15 plies of cross-laminated wood lamellas.

CROSSWISE TOP PLY

Top plies in the crosswise direction to the panels (DQ) are mainly used for wall elements. Their bearing direction is vertical. DQ panels consist of three to five plies as standard. Production widths: up to 3.10 m.

LONGITUDINAL TOP PLY

CLT panels with top plies in longitudinal direction to the panel (DL) are primarily used for ceiling and roof elements. Their bearing direction is horizontal. They usually consist of three to seven plies.

3S CLT BOARDS

PFEIFER CLT60 80
90
100
110
120
 3s3s
3s 3s 3s3s 
Fibre orientationTop ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Structure (mm)
20-20-2030-20-3030-30-3030-40-30
40-30-4040-40-40
Thickness (mm)
60
8090100
110120
Lengths (m)
8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m
Billing widths (m)
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
Weight* (kg/m²)
28.8
38.443.2
48.052.857.6


3S CLT BOARDS

PFEIFER CLT100 120
140
150
160
180
200
 5s5s
 5s 5s 5s5s 5s
Fibre orientationTop ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Structure (mm)
20-20-20-20-2030-20-20-20-3040-20-20-20-4040-20-30-20-4040-20-40-20-4040-30-40-30-4040-40-40-40-40
Thickness (mm)
100
120
140
150
160
180
200
Lengths (m)
8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m
Billing widths (m)
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cmn

Weight* (kg/m²)

48.0

57.6

67.2

72.0

76.8

86.4

96.0


3S CLT BOARDS

PFEIFER CLT180 200
220
240
260
280
 7s7s
7s 7s 7s7s 
Fibre orientationTop ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Structure (mm)
30-20-30-20-30-20-3020-40-20-40-20-40-2030-30-30-40-30-30-3030-40-30-40-30-40-3030-40-40-40-40-40-3040-40-40-40-40-40-40
Thickness (mm)
180
200
220
240
260
280
Lengths (m)
8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m
Billing widths (m)
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm

Weight* (kg/m²)

86.4

96.0

105.6

115.2

124.8

134.4


3S CLT BOARDS

PFEIFER CLT180 200
220
240
260
280
 7ss7ss
7ss 7s 7s7s 
Fibre orientationTop ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Top ply longitudinal
or cross-wise possible
DQ/DL
Structure (mm)
30-30-20-20-20-30-3030-30-30-20-30-30-3030-30-30-40-30-30-30 40-40-20-40-20-40-4040-40-30-40-30-40-4040-40-40-40-40-40-40
Thickness (mm)
180
200
220
240
260
280
Lengths (m)
8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m8.00 m up to 14.5 m
Billing widths (m)
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm
2.45 up to 3.10 m
in increments of 5 cm

Weight* (kg/m²)

86.4

96.0

105.6

115.2

124.8

134.4


Further structures possible upon request.

* Calculated with 480 kg/m³
ss Top ply consist of two longitudinal plies

PFEIFER CLT relies on visual appearance

Wood is a natural product that swells and contracts depending on its changing moisture content. Careful technical drying counter-acts this effect. PFEIFER CLT is dispatched with a moisture content of at least 12 % +/- 2 % to minimise the formation of cracks and visible gaps. Thanks to expert processing the material achieves an excellent product quality. Our wood panels are available in various visible appearance classes for different applications, while all panels are sanded to a certain visible quality. The individual lamellas are sorted on the basis of defined criteria.

Area of application

INDUSTRIAL QUALITY (IQ)

Structural building elements intended for subsequent covering (e.g. with drywall or 3-layer panels

INDUSTRIAL VISIBLE QUALITY (ISQ)

Visible building elements in subordinate areas in commercial and industrial construction / elements viewed at a distance (e.g. projecting roofs), can be used in residential areas with restrictions

RESIDENTIAL VISIBLE QUALITY (WSQ)

Visible building elements, particularly residential areas. Includes kindergartens, schools and offices. Surface treatment (on site) recommended (e.g. using stains, UV protection, ...)

Demands towards surface quality

INDUSTRIAL QUALITY (IQ)

No visual demands towards surface quality, instead demands purely towards strength (C24) with occasional gaps, knots in the top ply, glue penetration as well as occasional pressure marks and contamination can occur, discolouration (e.g. blue stains) possible, glue penetration possible

INDUSTRIAL VISIBLE QUALITY (ISQ)

Medium demands, elevated visual criteria towards top lamellas, individual narrow gaps; slight discolouration possible

RESIDENTIAL VISIBLE QUALITY (WSQ)

High demands, special requirements towards homogeneous surface structure and lamella quality, occasional slight/light discolouration possible NOTES

Notes on production technology

INDUSTRIAL QUALITY (IQ)

Finger joints visible in top ply, without narrow side gluing

INDUSTRIAL VISIBLE QUALITY (ISQ)

Finger joints visible in top ply, no narrow side gluing to prevent shrinkage cracks

RESIDENTIAL VISIBLE QUALITY (WSQ)

Finger joints visible in top ply, no narrow side gluing to prevent shrinkage cracks.

Chamfer

INDUSTRIAL QUALITY (IQ)

no chamfer

INDUSTRIAL VISIBLE QUALITY (ISQ)

Chamfer (approx. 5 mm) on DL panels (at element edges), DQ without chamfer

RESIDENTIAL VISIBLE QUALITY (WSQ)

Chamfer (approx. 5 mm) on DL panels (at element edges), DQ without chamfer

Factory surface finish

INDUSTRIAL QUALITY (IQ)

Lamellas planed, sanded upon request, cross-sanding possible for DQ panels

INDUSTRIAL VISIBLE QUALITY (ISQ)

Full sanded (single or both sides); cross-sanding possible for DQ panels

RESIDENTIAL VISIBLE QUALITY (WSQ)

Full sanded (single or both sides); cross-sanding possible for DQ panels

Factory surface treatment

INDUSTRIAL QUALITY (IQ)

Not possible

INDUSTRIAL VISIBLE QUALITY (ISQ)

Not possible

RESIDENTIAL VISIBLE QUALITY (WSQ)

Possible in collaboration with external partners upon request

Moisture content (approx.) at time of dispatch

INDUSTRIAL QUALITY (IQ)

12 +/- 2%

INDUSTRIAL VISIBLE QUALITY (ISQ)

12 +/- 2%

RESIDENTIAL VISIBLE QUALITY (WSQ)

12 +/- 2%

Cracks gaps

INDUSTRIAL QUALITY (IQ)

INDUSTRIAL VISIBLE QUALITY (ISQ)

RESIDENTIAL VISIBLE QUALITY (WSQ)

Applies to all: Wood is a natural product, which is why: Like all solid wood products, the above stated qualities are subject to crack and gap formation as a result of drying to their future compensation moisture balance when installed due to the product characteristics. This cannot be prevented.

Notes:
  • Visible surfaces should always be sampled: Talk to us
  • Specific criteria (knot sizes etc.) of surface versions: upon request
  • Surface qualities can be realised on one or both sides; visual criteria do not apply to narrow sides as well as processing edges
  • A panel structure switch may be required if residential visible quality is needed