Panel types, surfaces
& technical characteristics

Learn more

Panel types

KLH® - CLT is offered in 3 standard qualities. Upon request special surfaces and panel built-ups are possible, depending on the availability of the raw lamellas and technical feasibility. Special structures are possible upon request.


By using double layers, the board’s longitudinal and transverse rigidity can be increased in a targeted manner. Changes to the board structure can be used to increase its fire resistance in order to meet special project requirements.

Maximum formatLength 16.50 m / Width 3.50 m / Thickness up to 0.50 m
Minimum production length8.25 m - respectively in 5 cm increments up to the maximum length
Invoicing widths2.45, 2.50, 2.73, 2.95, 3.10, 3.20, 3.30, 3.40, 3.50 m

For the wall Covering layer in the transverse panel direction TT

Nominal thickness in mm in Layers TypLamella structure [mm]

For slab and roof Covering layer in the longitudinal panel direction TL

Nominal thickness in mm in Layers TypLamella structure [mm]

Surfaces &

As a standard, we produce KLH® - CLT in spruce and in three different surface qualities, which can be combined as required. This applies without restriction for all the panel types shown previously.

Surfaces treatment and special surfaces

Both the industrial visible quality and the domestic visible quality panels are fully sanded. We also offer domestic visible quality surfaces in a brushed version. Should you require UV protection, varnished elements or any other surface treatment, please contact us. The same applies to surfaces in other types of wood, which we can offer depending on customer requirements and the availability of raw materials.

Overview of the individual surfaces

 Domestic Visible (DVQ)Industrial Visible (IVQ)Non Visible (NVQ)
Application AreaVisible components without restrictions used in residential constructions.Visible components with moderate restrictions, not recommendet for residential constructions.Pure structural components with subsequent panelling.
Demand towards Surfacehigh demandmedium demandno demand
Production-Related Referenceschamfer on TL panels
(in the panel width joint)
chamfer on TL panels
(in the panel width joint)
no chamfer
Surface Finishing In-Plantfully sanded (one- or double sided) also one side brushedfully sanded (one- or double sided) equalised (planed or sanded)
Surface Treatment In-Planton request on request protective coating on request, finishing not available

Minimum requirements

The minimum requirements for each surface described refer to the time of delivery. For narrow sides and CNC-treated surfaces, the criteria for non-visible surfaces apply.

Criteria Domestic visible (DVQ) Industrial visible (IVQ) Non visible (NVQ)
Surface treatmentsandedsanded, individual small rough areas permittedequalised (planed or sanded)
Type of woodone type of wood one type of wood;
spruce / fir (≤ 10 %)
are regarded as one
type of wood
addition of other types of wood possible
Colour and texture mostly balanced generally balanced no requirements
Blue and brown stains, red tingeslight discolouration
permissible (≤ 3 %)
slight discolouration
permissible (≤ 5 %)
no restrictions
Branches, tightly intergrownpermissiblepermissibleno restrictions
Branches, blackpermissible ≤ 25 mm Ø permissible ≤ 35 mm Øno restrictions
Loose knots, knot holespermissible ≤ 12 mm Ø permissible ≤ 15 mm Øno restrictions
Resin pocketssporadically permissible
≤ 3 x 50 mm
sporadically permissible
≤ 5 x 70 mm
no restrictions
Pithssporadically permissible
length ≤ 800 mm
sporadically permissible
length ≤ 1000 mm
no restrictions
Bark ingrowthimpermissible impermissible no restrictions
Waneimpermissible impermissible permissible
Compression wood sporadically permissible sporadically permissible no restrictions
Cut burrows from inactive
insect infestation
impermissible impermissible sporadically permissible
Wood moisture during production≤ 12 % ≤ 13 %≤ 14 %
Cracks and joints
(at a reference moisture measurement of 12 %)
sporadically permissible
≤ 1,5 mm
sporadically permissible
≤ 2 mm
sporadically permissible
≤ 6 mm
Surface defectssporadically permissible
≤ 12 mm Ø
sporadically permissible
≤ 15 mm Ø
no restrictions
Surface re-treatment
(Filling and plugging of branch holes, strips, etc.)
permissiblepermissible no restrictions
Defects on cutting edgessporadic small
defects permissible
sporadic defects
no restrictions
Cutting edge re-treatment
manually, using sand paper
Chamfer on TL panels
(in the panel width joint)
Range of validityThe given surface qualities valid:
- at the time of delivery
- only for the covering layer, not for the narrow sides
- for one-sided visible surfaces
- for narrow sides and CNC-treated surfaces, the criteria for NVQ surface quality apply
- for double-sided visible surfaces, a small amount of on-site reworking is to be expected
Crack formationLike all solid wood products, the above stated qualities are subject to crack and joint formation as a result of drying to their future compensation moisture balance when installed due to the product characteristics. This cannot be prevented. Especially in the first few years, cracking noises can also occur alongside the formation of cracks, which can be classified as harmless.
NoteWood is a natural product. Minor deviations from the table values are natural and are no reason for complaint.




Technical characteristics

Product name / BrandKLH® - CLT
OTHER PRODUCT NAMESCross-laminated timber (CLT) | X-Lam
APPLICATIONStructural elements for walls, floors and roofs
DURABILITYService classes 1 and 2 according to EN 1995-1-1
WOOD SPECIESSpruce (pine, fir, stone pine and other wood types on request)
PANEL BUILD UP3, 5, 7 or more layers depending on static requirements
LAMELLAEThickness 20 to 45 mm, technically dried, quality-sorted and finger-jointed
STRENGTH CLASSC 24 according to EN 338, maximum 10% C 16 permitted (compare ETA-06/0138)
ADHESIVEFormaldehyde-free PUR adhesive, approved for load-bearing and non-load-bearing components indoors and outdoors according to EN 15425
WOOD MOISTURE CONTENT12% (+/- 2%) on delivery
MAXIMUM ELEMENT DIMENSIONSLength 16.50 m / width 3.50 m / thickness 0.50 m
INVOICING WIDTHS2.45 | 2.50 | 2.73 | 2.95 | 3.10 | 3.20 | 3.30 | 3.40 | 3.50 m
SURFACE QUALITYNon-visual quality (NVQ) | Industrial visual quality (IVQ) | Domestic visual quality (DVQ)
Special surfaces on request
WEIGHT5.5 kN/m³ according to ÖNORM B 1991-1-1:2011 for structural analysis
500 kg/m³ for determination of transport weight
MOISTURE MOVEMENTIn panel plane 0.02% per % change in wood moisture content,
perpendicular to panel plane (panel thickness direction) 0.24% per % change in wood moisture content
THERMAL CONDUCTIVITYλ = 0.12 W/(m*K) according to EN ISO 10456
HEAT STORAGE CAPACITYcp = 1600 J/(kg*K) according to EN ISO 10456
VAPOUR RESISTANCEµ = 300 (dry) to 46 (wet) according to EN ISO 12572
AIR TIGHTNESSKLH® - CLT can generally be used as airtight layers (Class 4 acc. to EN 12207).
Connections to other components, butt joints, penetrations, etc. must be sealed appropriately.
REACTION TO FIREEuro class D-s2, d0
RESISTANCE TO FIREFire analysis parameters acc. to ETA - 06/0138


Technical Approvals, Certificates and Eco-labels

Find a partner
in your area.

To the interactive map

We are there for you.
+43 3588 8835

KLH Massivholz GmbH
Gewerbestrasse 4
A-8842 Teufenbach-Katsch
KLH Massivholz Wiesenau GmbH
Wiesenau 2
9462 Bad St. Leonhard

Together with our customers we are contributing to an eco-friendly and sustainable future– this drives us and makes us proud.

Marco Huter | Managing Director

With innovations and continuous development of production technology, we are always focused on the needs of our customers. Our responsible handling of the renewable and sustainable resource “wood” pursues the goal of managing ecological and economic challenges.

Johann Hochegger | Managing Director

Research and development have always been a part of our concept. We aim to use innovative, efficient and both economically and ecologically sustainable solutions in solid timber construction.

Johannes Habenbacher | Chief Technical Officer

We want to prove our know-how and long-term experience on international level and expand our technology leadership.

Sonja Moder | Authorized Representative

We are there
for you.