TECHNICAL CHARACTERISTICS

Transcription

1 TECHNICAL CHARACTERISTICS The technical characteristics of KLH cross-laminated timber panels are: Board Format Max. length 16.50m For UK transportation, we would recommend a maximum length of 13.50m Board Thickness Board Layers Max. width 2.95 Standard thicknesses are between mm, but panels can be created up to 500mm if required Layers can be between 3-9 layers, standard layers are: 3 layers - 60, 63, 78, 90, 94, 98, 102, 108 mm 5 layers - 95, 101, 117, 125, 128, 146, 158, 162, 170, 182 mm 7 layers - 202, 226, 256 mm Dimensional Stability Parallel to board Negligible movement Normal to board Standard 12% ± 2% Moisture 12% +/-2 technologically dried Surface Panel Quality Fire Performance Domestic Visual Quality (Wsi) Industrial Visual Quality (Isi) 0.2 mm/m per % moisture outside Non Visual Quality (Nsi) Reaction to fire EN Euroclass D s2 Euroclass Dfl s1 Resistance to fire Charring rate of all lamella including outer lamella Charring rate of the outer lamella only Acoustic Performance BS EN Airborne sound insulation KLH 94 3 s TT KLH s TL BS EN Impact sound insulation BS EN Sound absorption - - Thermal Performance 0.76 mm/min 0.67 mm/min ~ 33 db ~ 37 db Thermal conductivity, λ BS EN ,13 W/(m K) Specific heat capacity, Cp BS EN J/(kg K) Air tightness BS EN Durability Durability of timber - Service class BS EN and 2

2 KLH Panel Type: TL (Top Layers Longitudinal) Characteristic strength for actions perpendicular to the span of the panel Modulus of elasticity Parallel to the grain of the outer lamella, E 0, mean Perpendicular to the grain direction of the outer lamella, E 90, mean I eff 12,000 N/mm N/mm 2 Shear modulus Parallel to the grain of the outer lamella, G mean Perpendicular to the grain direction of the outer lamella, G R, mean EN N/mm 2 50 N/mm 2 Bending strength W eff 24 N/mm 2 Parallel to the grain of the outer lamella, f m, k Tensile strength EN 1194, reduced 0,12 N/mm 2 Perpendicular to the grain of the outer lamella, f t, 90, k Compressive strength EN ,7 N/mm 2 Perpendicular to the grain of the outer lamella, f c, 90, k Shear strength Parallel to the grain of the outer lamella, f v, k Perpendicular to the grain direction of the outer lamella, f R, v, k EN 1194 A gross 2,7 N/mm N/mm 2

3 KLH Panel Type: TT (Top Layers Transverses) Characteristic strength for actions in the plane of the panel Requirement Verification method Value Modulus of elasticity Parallel to the grain of the outer lamella, E0, mean Anet, Ieff 12,000 N/mm2 Shear modulus Parallel to the grain of the outer lamella, Gmean Anet 250 N/mm2 Bending strength Parallel to the grain of the outer lamella, fm, k Wnet 23 N/mm2 Tensile strength Parallel to the grain of the outer lamella, ft, 0, k EN N/mm2 Compressive strength Perpendicular to the grain of the outer lamella, fc, 0, k Concentrated, parallel to the grain of the outer lamella fc,0,k EN N/mm2 30 N/mm2 Shear strength Parallel to the grain of the outer lamella, fv, k Anet 5,2 N/mm2 Further details on the technical characteristics of KLH s cross-laminated timber panels are available within the KLH UK Cross-Laminated Timber Specification document.

4 Requirement of Insulation and U-Values Comparing cross-laminated timber with a common building material such as concrete (thermal conductivity λ= ca. 1.8 W/m*K ) or bricks, the insulation performance of timber (λ = 0.13 W/m*K ) is naturally excellent. The tables below show the minimum thickness of insulation needed to meet the requirements of UK standards (England, Wales, Scotland and Northern Ireland). The minimum U-values are listed as well as the specified thermal conductivity of the insulation material that might be used. U-values are given by the Approved Document L1A (British Building Regulations). Typical KLH Panel - 94mm Thickness KLH Panel 94mm Area Element Required U-Value W/m 2 *K England, Wales, N. Ireland Required Thickness (in mm) of insulation dependent on its thermal conductivity (lambda in W/m*K) Wall Floor Roof Scotland Wall Floor Roof Typical KLH Panel - 128mm Thickness KLH Panel 128mm Area Element Required U-Value W/m 2 *K England, Wales, N. Ireland Required Thickness (in mm) of insulation dependent on its thermal conductivity (lambda in W/m*K Wall Floor Roof Scotland Wall Floor Roof Typical KLH Panel - 140mm Thickness KLH Panel 140mm Area Element Required U-Value W/m 2 *K England, Wales, N. Ireland Required Thickness (in mm) of insulation dependent on its thermal conductivity (lambda in W/m*K) Wall Floor Roof Scotland Wall Floor Roof

5 Panel Surface Quality Wood as a natural material is highly varied in its structure and has many natural characteristics. Often such characteristics can impair its visual appearance. Common visual characteristics are knots, annual rings and fissures. The surface appearance of KLH cross-laminated timber panels is dependent on the surface type specified: Domestic Visual Quality (Wsi) Industrial Visual Quality (Isi) Non-Visual Quality (Nsi) and the outer lamella direction i.e. TT or TL. The surface appearance of Wsi panels is of sufficient quality to be left exposed internally, should it be required, but the Nsi is manufactured as a non-visual panel which should not be left exposed. As standard, Wsi and Isi visual surface finishes are only available on one side. Domestic Visual Quality (Wsi) For TT panels the outer lamella are perpendicular to the manufactured panel length and are generally used as wall elements. For TL panels the outer lamella are parallel to the manufactured panel length and are generally used as floor and roof elements. Depending on the orientation of the outer lamella (TT or TL panels), the outer lamella may be finger-jointed. The width of the boards in the outer lamella of TL panels may vary from 80 to 120mm. The outer lamella of TT panels are formed from boards < 80 mm wide which are then edge glued to form boards up to 1200 mm wide. The outer lamella of TT and TL panels are visually selected to have minimum defects. The surface lamella are planed and sanded to achieve appearance class A/B in accordance with BS EN :2001 Table 1 (see the KLH UK Cross-Laminated Timber Specification document, Table 7 for further details). At a moisture content of 12% ± 2% a maximum gap width of 2 mm between the lamella is permissible. The edges of all Wsi panels are chamfered as standard. Industrial Visual Quality (Isi) For TT panels the outer lamella are perpendicular to the manufactured panel length and are generally used as wall elements. For TL panels the outer lamella are parallel to the manufactured panel length and are generally used as floor and roof elements. Depending on orientation of the outer lamella (TT or TL panels), the outer lamella may be fingerjointed. The outer lamella width may vary from 80 to 240mm. The surface lamella are planed and lightly sanded to achieve appearance class B in accordance with BS EN :2001 Table 1 (see the KLH UK Cross-Laminated Timber Specification document, Table 7 for further details). At a moisture content of 12% ± 2% a maximum gap width of 4mm between the lamella is permissible. Non Visual Quality (Nsi) There is no appearance class in accordance with BS EN :2001 Table 1. Boards are C24 (10% C16 permissible) in accordance with BS EN :2005 Table 1. Nsi panels will not be provided for visual surfaces unless requested by the client on the understanding that KLH UK will not accept any liability for visual appearance of Nsi panels. The definition of surface finishes above are subjective and may lead to widely differing interpretations on what constitutes an acceptable finish. Reference panels demonstrating surface finishes Wsi, Isi and Nsi are available on request from our London office, or can be viewed by appointment.

6 TECHNICAL APPROVALS KLH has third party technical certification and accreditations for the manufacture of KLH solid timber panels including: Full European Technical Approval (ETA 06/138) BRE Durability Report 60 year lifespan Contractors Health and Safety Assessment Scheme (CHAS) PEFC Chain of Custody Certificate KLH Massivholz has attained EN ISO 9001:2008 and EN ISO 14001:2008 accreditation for the manufacture of KLH panels. NHBC - warranties have been provided on numerous residential buildings that incorporate KLH panels (certain design guidelines will have to be met, please refer to the NHBC for further details). KLH are members and supporters of: ProHolz, Austria PEFC (Programme for Endorsement of Forest Certification) FSC (Forest Stewardship Council) TRADA (Timber Research and Development Association) Timber Trade Federation Wood for Good