Panel types, surfaces
& technical characteristics

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Panel types

KLH® - CLT is offered in 3 standard qualities. Upon request special surfaces and panel build-ups are possible, depending on the availability of the required species 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 320 mm
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

Typicaly, for the wall Covering layer in the transverse panel direction TT

Nominal thickness [mm]in Layers TypeLamella structure [mm]
  
CLCLCLC
KLH®60mm3sTT202020
KLH®70mm3sTT203020
KLH®80mm3sTT302030
KLH®90mm3sTT 303030
KLH®100mm3sTT304030
KLH®110mm3sTT403040
KLH®120mm3sTT 404040
KLH®100mm5sTT2020202020
KLH®110mm5sTT2020302020
KLH®120mm5sTT3020202030
KLH®130mm5sTT3020302030
KLH®140mm5sTT3020402030
KLH®150mm5sTT3030303030
KLH®160mm5sTT 4020402040

Typically, for slab and roof Covering layer in the longitudinal panel direction TL

Nominal thickness [mm]in Layers TypeLamella structure [mm]
  
LCLCLCL
KLH®60mm3sTL202020
KLH®70mm3sTL203020
KLH®80mm3sTL302030
KLH®90mm3sTL 303030
KLH®100mm3sTL402040
KLH®110mm3sTL403040
KLH®120mm3sTL 404040
KLH®100mm5sTL2020202020
KLH®110mm5sTL2020302020
KLH®120mm5sTL3020202030
KLH®130mm5sTL3020302030
KLH®140mm5sTL4020202040
KLH®150mm5sTL4020302040
KLH®160mm5sTL 4020402040
KLH®170mm5sTL4030303040
KLH®180mm5sTL 4030403040
KLH®190mm5sTL4040304040
KLH®200mm5sTL4040404040
KLH®160mm5ssTL 30+304030+30
KLH®180mm7sTL 20402020204020
KLH®200mm7sTL20402040204020
KLH®220mm7sTL 30403020304030
KLH®240mm7sTL30403040304030
KLH®180mm7ssTL 30+3020202030+30
KLH®200mm7ssTL30+3020402030+30
KLH®220mm7ssTL40+4020202040+40
KLH®240mm7ssTL40+4020402040+40
KLH®260mm7ssTL40+4030403040+40
KLH®280mm7ssTL40+4040404040+40
KLH®300mm8ssTL40+403040+403040+40
KLH®320mm8ssTL40+404040+404040+40

Surface & Quality definition

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. 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 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 not possible

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) Industriel visible (IVQ) Non visible (NVQ)
 
Surface treatmentsandedsandedequalised (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 tinge slight discolouration
permissible (≤ 3 %)
slight discolouration
permissible (≤ 5 %)
no restrictions
Branches,
tightly intergrown
permissiblepermissibleno 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
≤ 3 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 % ≤ 12 %≤ 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
permissible
no restrictions
Cutting edge re-treatment
manually, using sand paper
yesyesno
Chamfer on DL panels (in the panel width joint)yesyesno
Range of validityThe given surface qualities valid:
- at the time of delivery
- only for the top layer, not for the edges
- for one-sided visible surfaces
- the edges and CNC-treated surfaces are subject to our NVQ surface criteria
- 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.

 

Technical
characteristics

 

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
LAMINATING PRESSUREAt least 0.6 N/mm²
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
Out-of-plane: 0.24% per 1% change in wood moisture content
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

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+44 (0) 20 3031 8070
General Business: office@klhuk.com
Project Enquiries: enquiry@klhuk.com

KLH UK Limited
2 The Canvas House
25 Queen Elizabeth Street
London
SE1 2NL

We really wanted to say thank you to everyone who has been involved in getting us this far. We have been really excited to see the structure go up and the on-site team have done an amazing job. The CLT looks great.

Mary & Klaus Morris | Blackwood House

I would like to record that I have been very impressed with your work on site and the efficiency of your construction team. The finished product is exactly as expected and was completed ahead of programme. Thank you for the efforts of your team.

David Spooner | Construction Project Manager | Hastings Pier Charity

Mayfield School are delighted with the new buildings. Innovative use of space and light in the atrium areas and other specialist classrooms will enhance the possibilities available to our staff and students.
The Sixth Form is designed not only to give a real feature (Heller-Up staircase), but is also a practical and useable large space which can be used by the whole school for various activities. The new building and external areas have created a real ‘WOW’ factor for our community as a whole.

Allison Greenwood | Deputy Headteacher | Mayfield School

The Mayfield School Project was delivered on time and within budget. It is to an excellent quality of workmanship which surpassed the expectations of the client team and the end user. The building’s design is rational, durable and above all maintainable which will ensure that Mayfield School will continue to provide teaching excellence within the London Borough of Redbridge.

Steve McConaghy | Senior Construction Project Manager| London Borough of Redbridge

I am the HT of a school in the UK which has been constructed using CLT. I am tremendously impressed with the very calm and purposeful learning environment that has been created. The students are so proud of the building and the exposed CLT is a major factor in this as it gives a high-end quality finish not common in schools in the UK. The CLT construction method enabled the building process to be rapid which was a major factor in us moving in on time.

Keir Smith | Head Teacher | William Perkin C of E School

We are completely delighted with the CLT!!! It’s been very exciting seeing our project in the factory and then going-up on site so quickly.
We love the exposed CLT walls and the character it gives the interiors – we can’t wait to move in. I think that the KLH team has been excellent throughout, from first contact, through the quotation stage to shop-drawings and the on-site erection crew – everyone has been very professional and helpful at all times. It has been a pleasure working with you all – I would be very happy to use KLH again in the future.

Ruth Butler | Ruth Butler Architects | Convent Lane

There is a great ambience in occupying a CLT school and it generates interest and a positive atmosphere with students, staff and visitors. Would definitely recommend it to another school.

Head Teacher | City Academy, Norwich

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