EN 14081-4:2005+A4:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte SystemeStructures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machineTimber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-4:2005+A4:2008SIST EN 14081-4:2005+A4:2009en,fr,de01-april-2009SIST EN 14081-4:2005+A4:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-4:2005+A4
December 2008 ICS 79.120.10; 79.040 Supersedes EN 14081-4:2005+A3:2008 English Version
Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
Structures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmesde contrôle par machine
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte Systeme This European Standard was approved by CEN on 26 August 2005 and includes Amendment 1 approved by CEN on 28 December 2006, Amendment 2 approved by CEN on 13 August 2007, Amendment 3 approved by CEN on 7 February 2008 and Amendment 4 approved by CEN on 20 November 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14081-4:2008+A4:2008: ESIST EN 14081-4:2005+A4:2009

! ", # $, % & and ' (. Other parts of this European Standard are EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section —
Part 1: General requirements EN 14081-2, Timber structures — Strength graded structural timber with rectangular cross section —
Part 2: Machine Grading - Additional requirements for initial type testing EN 14081-3, Timber structures — Strength graded structural timber with rectangular cross section —
Part 3: Machine Grading — Additional requirements for factory production control According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14081-2:2005 and the following apply. 3.1
Speed range maximum and minimum throughput speeds appropriate to the critical speed for the derived settings (see 6.2.2 of EN 14081-2:2005). 4 Symbols a deflection (in mm) b width of timber cross section (in mm)
F force (units as stated) I indicating property (units as stated) P pressure (units as stated) t thickness of timber cross section (in mm) Et,mean characteristic mean tensile modulus of elasticity parallel to grain (in N/mm2)
ft,k characteristic tensile strength (in N/mm2)
ρk characteristic value of density (in kg/m3) SIST EN 14081-4:2005+A4:2009

subscripts
n for setting being calculated a actual size measured as the average dimension of a batch 5 Settings for timber strength grading machines %Tables 1 to 11& give settings for certain grades, timber species and types of grading machine. Settings for other grades, species or grading machines shall be added when the relevant information is sent to, and assessed by, CEN/TC 124.
Picea abies Picea sitchensis 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 2,68 2,27 Requirements for grading: - Air temperature between + 10 °C and + 35 °C; - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ - 10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 150 m/min.
The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.)
an = 830,7 tn-1,299
(mm)
Pn = 4,412 Fn / tn0,61
(bar)
()572739,413n1.701nnn+=ttFbF
(kN) C16 1,24 Pine
Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 2,79 1,91 C16 1,34 Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C27 C16 3,03 1,43 C24 C16 2,32 2,09 C16 0,92 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. SIST EN 14081-4:2005+A4:2009

ƒmod Comments and adjustments for size Estonia Finland Latvia Norway Russia d Sweden Poland
Finland Norway Sweden Latvia EE FI LV NO RU SE PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 20,8 Requirements for grading: - Air temperature between + 10 °C and + 35 °C; - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ - 10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 150 m/min.
The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.)
Pn = 4,412 Fn / tn0,61
(bar)
Fn = (5,5I n n bntn3)10-12
(kN)
an = 830,7 tn-1,299
I n = 79.0mod24,022,0f4228nnbt C24 20,8 C27 21,8 C30 28,5 C35 C24 46,5 20,0 C40 C30 C18 54,5 30,6 23,8 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia.
The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.) an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 ()572739,413n1.701nnn+=ttFbF Spain ES Corsican pine Pinus nigra 40 ≤ tn ≤ 70 100 ≤ bn≤ 200 C30 C18 Not relevant as all settings shall be calculated using equations in comments column Requirements for grading: - Air temperature between + 10 °C and 35 °C; - Relative humidity in the air < 85 %; - Timber temperature > - 10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 100 m/min.
The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.) an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 FnC30 = (96,297 9 – 0,489 321 tn)anbntn3 / (1,318 943 3 × 109) FnC18 = (54,497 9 – 0,489 321 tn)anbntn3 / (1,318 943 3 × 109) a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. SIST EN 14081-4:2005+A4:2009

sitchensis 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 6,35 7,49 Requirements for grading: - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ - 10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 105 m/min.
The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.)
Fn = 0,010 1 bn tn2
(N)
()()91,0109851,07846,000567,071,36nn5nnn+×+=−btttaa
Actual deflection settings are determined from an/0,19 rounded to the nearest whole number. Refer to calibration tables for machine to convert force Fn to pressure setting C16 13,78 Pine Pinus nigra Pinus
sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 6,10 8,90 C16 12,74 Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C27 C16 5,62 11,86 C24 C16 7,35 8,13 C16 18,52 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. SIST EN 14081-4:2005+A4:2009

The following equations shall be used to calculate settings for the target size bn × tn where bn and tn are target dimensions.
Refer to calibration tables for machine to convert Fn to pressure setting.
20101,0nnntbF⋅⋅=
(N)
⋅⋅−⋅⋅⋅=−mod152,0186,0mod152,0814,014,218063fbtfbtannnnn
(Bits)
Actual deflection setting an shall be rounded to the nearest whole number of Bits (Bits are units of 0,19 mm).
If the actual thickness ta exceeds the target thickness tn by more than 1 mm then the pressure shall be increased by 3natt a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades specified by C are strength classes given in EN 338.
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea Abies
Pine Pinus Sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300C24 9,82 Requirements for grading: - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ -10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 105 m/min.
The following equations shall be used to calculate settings for the target size bn × tn where bn and tn are target dimensions.
Refer to calibration tables for machine to convert Fn to pressure setting.
20101,0nnntbF=
(N)
19,015050500901,0186,0−=nnnnbttaa
(Bits)
Actual deflection settings an shall be rounded to the nearest whole number of Bits (Bits are units of 0,19 mm).
If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt C27 6,21 C30 4,75 C35 3,40 C27 C16 5,85 8,92 C30 C18 4,75 9,82 C30 C24 C18 4,46 5,49 8,92 C35 C24 C18 3,40 4,94 7,96 C40 C27 2,83 5,49 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades specified by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia.
Sweden Estonia Latvia Russia c Poland
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea Abies
Pine Pinus Sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 TR26 6,21 Requirements for grading: - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ - 10 °C; - Timber mean moisture content > 10 %; - Maximum feed speed: 105 m/min.
The following equations shall be used to calculate settings for the target size bn × tn where bn and tn are target dimensions. Refer to calibration tables for machine to convert Fn to pressure setting. 20101,0nnntbF=
(N)
19,015050500901,0186,0−=nnnnbttaa
(Bits)
Actual deflection settings an shall be rounded to the nearest whole number of Bits (Bits are units of 0,19 mm).
If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt.
TR26 is a UK grade for trussed rafters. Its primary characteristic values are: ƒm,k = 28,3 N/mm², E0,mean = 11,0 kN/mm², k = 370 kg/m³. Other characteristic values can be calculated from the equations given in EN 384.
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. SIST EN 14081-4:2005+A4:2009

IP = fmod Comments and additional requirements Finland Norway Sweden Estonia. Latvia Russia d Poland
FI NO SE ES LV RU PL
Spruce Picea abies
30 ≤ tn ≤ 50 60 ≤ bn ≤ 225
C45 C30 C18 56,5 34,1 22,0 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air ≤ 85 %; - Timber temperature ≥ - 10 °C; - Timber mean moisture content > 10 %; - Feed speed between 48 m/min and 124 m/min; - Cupped timber shall not be graded.
The following equation shall be used to calculate settings: afbtF630,0mod740,0n093,2nn002792,0= where Fn is the indicating property in N (to obtain the indicating property in kilopond Fn shall be divided by 9,81), tn is the target thickness in mm, bn is the target width in mm (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the above equation is the target tn + 1 mm.) and fmod is given in the 6th column of this table for each grade. a is the pre-set deflection in mm and shall be: a = 1,6 mm
for 47 mm ≤ tn ≤ 50 mm a = 2,0 mm
for 36 mm ≤ tn ≤ 37 mm a = 1,7 mm
for 44 mm ≤ tn ≤ 46 mm a = 2,1 mm
for 34 mm ≤ tn ≤ 35 mm a = 1,8 mm
for 41 mm ≤ tn ≤ 43 mm a = 2,2 mm
for 32 mm ≤ tn ≤ 33 mm a = 1,9 mm
for 38 mm ≤ tn ≤ 40 mm a = 2,3 mm
for 30 mm ≤ tn ≤ 31 mm
The pre-set pressure shall be 23 bar.
The settings for C35-TR26-C18 can also be used for C35-C24-C18.
The characteristic values for the TR26 grade are:
ƒm,k = 28,3 N/mm², E0,mean = 11,0 kN/mm², k = 370 kg/m³. Other characteristic values can be calculated from the equations given in EN 384. C40 C30 C18 53,4 34,3 22,0 C35 TR26 C18 44,6 34,1 22,0 Finland Norway Sweden Latvia Russia d
FI NO SE LV RU Pine Pinus
sylvestris 30 ≤ tn ≤ 50 60 ≤ bn ≤ 225
C45 C30 C18 56,5 34,1 22,0 C40 C30 C18 53,4 34,3 22,0 C35 TR26 C18 44,6 34,1 22,0 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia.
IP = fmod Comments and additional requirements Germany Austria Czech Republic DE AT CZ Spruce Picea abies
Fir Abies alba 30 ≤ tn ≤ 50 95 ≤ bn ≤ 280 L36 L25 34,5 22,3 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 7 % and 15 %; - Feed speed between 80 m/min and 300 m/min; - Timber surface planed or sawn.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
L36 L35 L25 L24 ft,k (N/mm²) 22,0 21,0 14,5 14,0 Et,mean (kN/mm²) 13,0 13,0 11,0 11,0 ρk (kg/m³) 400 400 350 350 30 ≤ tn ≤ 55 80 ≤ bn ≤ 280 L35 L24 34,0 21,0 a
See 7.3 in EN 14081-1:2005. b
Timber size shall be according to EN 336.
IP Comments and additional requirements UK Ireland GB IE Sitka spruce Picea sitchensis 35 ≤ tn ≤ 80 70 ≤ bn ≤ 260 C24 C16 Emod = 10 800 Emod = 6 000 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 10 % and 30 %; - Maximum feed speed: 450 m/min; - Timber surface planed or sawn.
The moisture content shall be measured by a Brookhuis FMI In-line system. C16 Emod = 5 200 Germany Austria Czech Republic DE AT CZ Spruce Picea abies
Fir Abies alba 38 ≤ tn ≤ 100 89 ≤ bn ≤ 250 C27 C16 fmod = 36,0 fmod = 21,4 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 10 % and 18 %; - Maximum feed speed: 450 m/min; - Timber surface planed or sawn. C24 C18 fmod = 34,4 fmod = 30,8 C24 C16 fmod = 34,4 fmod = 29,8 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. The sizes of the two pieces after splitting shall be within the permitted timber size. This note is valid for all approved source countries and species for this machine. b
See 7.3 in EN 14081-1:2005. c
Timber size shall be to EN 336. d
Grades prefixed by C are strength classes given in EN 338.
IP = fmod Comments and additional requirements Germany Austria Czech Republic DE AT CZ Spruce Picea abies
Fir Abies alba 30 ≤ tn ≤ 50 95 ≤ bn ≤ 280 L25 L17 21,6 16,9 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 7 % and 15 %; - Maximum feed speed: 450 m/min - Timber surface planed or sawn.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
L40 L36 L25 L17 ft,k (N/mm²) 26,0 22,0 14,5 11,0 Et,mean (kN/mm²) 14,0 13,0 11,0 9,0 ρk (kg/m³) 420 400 350 320 L36 L25 L17 32,9 26,8 14,7 L40 L25 L17 39,6 20,8 19,1 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. The sizes of the two pieces after splitting shall be within the permitted timber size. This note is valid for all approved source countries and species for this machine. b
See 7.3 in EN 14081-1:2005. c
Timber size shall be according to EN 336.
CH Spruce Picea abies
Fir Abies alba 26 ≤ tn ≤ 66 63 ≤ bn ≤ 319 L22 6,8 5 200 305 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 7 % and 15 %; - Maximum feed speed: 450 m/min; - Timber surface planed or sawn.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
L40 L36 L30 L27 L25 ft,k (N/mm²) 26,0 22,0 18,0 16,0 14,5 Et,mean (kN/mm²) 14,0 13,0 12,0 11,5 11,0 ρk (kg/m³) 420 400 380 370 350
L22 L17 ft,k (N/mm²) 13,0 11,0 Et,mean (kN/mm²) 10,0 9,0 ρk (kg/m³) 340 320
L25 16,9 3 900 334 L27 L17 21,0 12,4 4 000 6 800 377 305 L30 L17 25,4 6,8 7 900 5 200 390 305 L40 L25 39,8 19,1 11 600 8 600 434 322 L36 L25 L17 32,3 20,9 16,4 10 100 8 900 7 900 412 331 305 L40 L30 L17 39,8 31,2 6,8 11 600 9 400 5 200 434 385 305 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. The sizes of the two pieces after splitting shall be within the permitted timber size. This note is valid for all approved source countries and species for this machine. b
See 7.3 in EN 14081-1:2005. c
Timber size shall be to EN 336.
IP = fmod Comments and additional requirements Finland Norway Sweden Estonia Latvia Russia e Poland FI NO SE ES LV RU PL Spruce Picea abies 35 ≤ tn ≤ 55 90 ≤ bn ≤ 220 C40 C30 C18 55,6 40,2 13,5 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 10 % and 20 %; - Timber surface finish planed or sawn; - Maximum feed speed: 450 m/min.
The settings for C30-C18 can also be used for TR26-C18.
TR26 is a UK grade for trussed rafters. Its primary characteristic values are: ƒm,k = 28,3 N/mm², E0,mean = 11,0 kN/mm², k = 370 kg/m³.
Other characteristic values can be calculated from the equations given in EN 384. C30 C18 36,5 13,5 C35 C27 C18 52,3 37,6 13,5 C35 C24 52,3 22,7 C27 C16 35,9 13,5 TR26 C16 29,9 13,5 C24 13,5 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. The sizes of the two pieces after splitting shall be within the permitted timber size. This note is valid for all approved source countries and species for this machine. b
See 7.3 in EN 14081-1:2005. c
Timber sizes shall be according to EN 336. d
Grades prefixed by C are strength classes given in EN 338. e
Settings apply only to timber grown west of the Ural mountain range in Russia.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
LD26 LD22 LD18 LD15 LD11 ft,k N/mm2 26,0 22,0 18,0 14,5 11,0 Et,mean kN/mm2 14,0 13,0 12,0 11,0 9,0 ρk kg/m3 410 390 370 350 320
LD26 LD15 35,6 9,5 11 800 7 500 426 325 LD22 LD15 27,3 14,3 10 800 10 000 385 353 LD22 LD11 27,3 9,0 10 800 7 000 385 315 LD18 10,0 8 000 356 LD15 9,5 7 500 325 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. The sizes of the two pieces after splitting shall be within the permitted timber size. This note is valid for all approved source countries and species for this machine. b
See 7.3 in EN 14081-1. c
Timber size shall be to EN 336. d
Settings apply only to timber grown west of the Ural mountain range in Russia. SIST EN 14081-4:2005+A4:2009

IP = fmod Comments and additional requirements Germany Austria Czech Republic DE AT CZ Spruce Picea abies
Fir Abies alba 18 ≤ tn ≤ 55 80 ≤ bn ≤ 280 L40 L35 L24 L16 40,0 31,0 19,0 14,0 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 7 % and 15 %; - Feed speed between 80 m/min and 120 m/min; - Timber surface planed.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
L40 L35 L24 L16 ft,k (N/mm²) 26,0 21,0 14,0 10,0 Et,mean (kN/mm²) 14,0 13,0 11,0 8,0 ρk (kg/m³) 420 400 350 350 a
See 7.3 in EN 14081-1:2005. b
Timber size shall be according to EN 336.
IP = fmod Comments and additional requirements Finland Norway Sweden Estonia Latvia Russia c Poland Germany Austria Czech Republic FI NO SE ES LV RU PL DE AT CZ Spruce Picea abies 20 ≤ tn ≤ 50 80 ≤ bn ≤ 280 LS22 31 Requirements for grading: - Timber temperature > 0 °C; - Timber mean moisture content between 7 % and 15 %; - Feed speed between 80 m/min and 120 m/min; - Timber surface planed.
These grades apply to timber where tensile strength controls the design.
The characteristic values for the grades are:
LS22 LS18 LS15 ft,k (N/mm²) 22,0 18,0 14,5 Et,mean (kN/mm²) 13,0 12,0 11,0 ρk d (kg/m³) 390 370 330
LS18 23 LS15 14 LS22 LS15 36 29 a
See 7.3 in EN 14081-1:2005. b
Timber size shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. d
The density values are indicative only and were not taken into account when calculating settings.
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus sylvestris
These settings are not for pine graded on its own. See other table.
34 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 4 300 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air: < 85 %; - Timber temperature > -10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed: ≤ 1 m/s; - Spacing between pieces: ≥ 200 mm; - Grading speed: ≤ 100 pieces/min. Dynagrade HC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 250mm: ≤ 150 pieces/min. Dynagrade XHC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 100 mm: ≤ 240 pieces/min; for 100 mm < bn ≤ 250 mm:
78 000/(b+225) pieces/min.
Actual setting, I is given in machine units and it is not affected by the timber dimensions.
Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= C24 C16 5 010 000 4 350 000 C27 5 080 000 C27 C16 5 230 000 4 350 000 C30 6 480 000 C30 C18 6 480 000 4 350 000 C30 C24 7 250 000 5 550 000 C30 C24 C18 6 520 000 5 970 000 4 490 000 C35 C24 C18 7 780 000 5 680 000 5 130 000 C30 C16 6 480 000 4 350 000 C27 C18 5 850 000 5 040 000 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia. SIST EN 14081-4:2005+A4:2009

78 000/(b+225) pieces/min.
Actual setting, I is given in machine units and it is not affected by the timber dimensions.
Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= C24 C16 5 150 000 4 180 000 C27 4 730 000 C27 C16 5 330 000 4 180 000 C30 5 500 000 C30 C18 5 500 000 4 180 000 C30 C24 6 460 000 5 220 000 C30 C24 C18 5 840 000 5 580 000 4 960 000 C35 C24 C18 6 470 000 5 220 000 4 960 000 C30 C16 5 500 000 4 180 000 C27 C18 5 330 000 4 550 000 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be to EN 336. c
Grades prefixed by C are strength classes given in EN 338.
FI NO SE ES LV RU PL DE AT CZ Spruce Picea abies
Fir Abies alba 31 ≤ tn ≤ 110 63 ≤ bn ≤ 264 C24 4 300 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air < 85 %; - Timber temperature > - 10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed: ≤ 1 m/s; - Spacing between pieces: ≥ 200 mm; - Grading speed: ≤ 100 pieces/min. Dynagrade HC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 250 mm:
≤ 150 pieces/min. Dynagrade XHC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed
for widths ≤ 100mm: ≤240 pieces/min; for 100 mm < bn ≤ 250 mm:
78 000/(b+225) pieces/min.
Actual setting, I is given in machine units and it is not affected by the timber dimensions. Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= TR26 is a UK grade for trussed rafters. Its primary characteristic values are: ƒm,k = 28,3 N/mm², E0,mean = 11,0 kN/mm², k = 370 kg/m³. Other characteristic values can be calculated from the equations given in EN 384. TR26 C16 6 150 000 4 300 000 TR26 C18 6 150 000 4 300 000 C27 C18 6 150 000 4 420 000 C30 C18 6 900 000 4 300 000 C30 C24 C18 6 900 000 5 770 000 4 650 000
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. d
Grades prefixed by C are strength classes given in EN 338. SIST EN 14081-4:2005+A4:2009

Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus sylvestris
These settings are not for pine graded on its own. See other table.
20 ≤ tn ≤ 45 95 ≤ bn ≤ 195 LS18 5 420 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air < 85 %; - Timber temperature > - 10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed: ≤ 1 m/s; - Spacing between pieces: ≥ 200 mm; - Grading speed: ≤ 100 pieces/min. Dynagrade HC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 250 mm:
≤ 150 pieces/min. Dynagrade XHC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed
for widths ≤ 100 mm: ≤240 pieces/min for 100 mm < bn ≤ 250 mm:
78 000/(b+225) pieces/min. These LS grades apply to timber where tensile strength controls the design. Actual setting, I is given in machine units and it is not affected by the timber dimensions. Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= Characteristic values of the grades:
LS26 LS22 LS18 LS15 LS11 ft,k (N/mm²) 26,0 22,0 18,0 14,5 11,0 Et,mean (kN/mm²) 14,0 13,0 12,0 11,0 9,0 ρk d (kg/m³) 410 405 390 385 380LS22 LS11 6 680 000 4 300 000 LS22 LS15 6 750 000 4 860 000 LS26 LS15 7 270 000 4 300 000 LS26 LS18 7 360 000 6 290 000 LS26 C18 7 310 000 4 350 000 a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. d
The density values are indicative only and were not taken into account when calculating settings. e
Grades prefixed by C are strength classes given in EN 338. SIST EN 14081-4:2005+A4:2009

FI NO SE ES LV RU PL DE AT CZ Spruce Picea abies
Fir Abies alba 19 ≤ tn ≤ 50 85 ≤ bn ≤ 242 LS15 4 300 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air < 85 %; - Timber temperature > -10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed: ≤ 1 m/s; - Spacing between pieces: ≥ 200 mm; - Grading speed: ≤ 100 pieces/min. Dynagrade HC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 250 mm:
≤ 150 pieces/min. Dynagrade XHC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed
for widths ≤ 100 mm: ≤ 240 pieces/min; for 100 mm < bn ≤ 250 mm:
78 000/(b+225) pieces/min. These grades apply to timber where tensile strength controls the design. Actual setting, I is given in machine units and it is not affected by the timber dimensions. Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= Characteristic values of the grades:
LS26 LS22 LS18 LS15 LS11 ft,k (N/mm²) 26,0 22,0 18,0 14,5 11,0 Et,mean (kN/mm²) 14,0 13,0 12,0 11,0 9,0 ρk d (kg/m³) 410 400 380 375 365LS18 6 110 000 LS22 LS11 6 950 000 4 300 000 LS22 LS15 7 120 000 5 880 000 LS22 LS18 7 130 000 6 780 000 LS26 LS15 7 440 000 5 420 000 LS26 LS18 7 560 000 6 640 000
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. d
The density values are indicative only and were not taken into account when calculating settings.
FI NO SE
Pine Pinus
sylvestris
19 ≤ tn ≤ 53 85 ≤ bn ≤ 248 LS15 5 350 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air < 85 %; - Timber temperature > - 10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed: ≤ 1 m/s; - Spacing between pieces: ≥ 200 mm; - Grading speed: ≤ 100 pieces/min. Dynagrade HC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed for widths ≤ 250 mm:
≤ 150 pieces/min. Dynagrade XHC - Conveyor speed: ≤ 1,3 m/s; - Spacing between pieces: ≥ 225 mm; - Grading speed
for widths ≤ 100 mm: ≤ 240 pieces/min; for 100 mm < bn ≤ 250 mm:
78 000/(b+225) pieces/min. These grades apply to timber where tensile strength controls the design. Actual setting, I is given in machine units and it is not affected by the timber dimensions. Where timber has a mean moisture content between 16 % and 20 % with a minimum value of 14 % and a maximum value of 22 % then the settings shall be calculated according to the following equation and rounded to 3 significant digits. III0738,018−= Characteristic values of the grades:
LS26 LS22 LS18 LS15 LS11 ft,k (N/mm²) 26,0 22,0 18,0 14,5 11,0 Et,mean (kN/mm²) 14,0 13,0 12,0 11,0 9,0 ρk c (kg/m³) 435 435 435 420 405LS18 5 840 000 LS22 LS11 6 240 000 4 360 000 LS22 LS15 6 350 000 5 500 000 LS22 LS18 6 400 000 6 070 000 LS26 LS15 6 460 000 5 500 000 LS26 LS18 6 730 000 6 280 000
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
The density values are indicative only and were not taken into account when calculating settings.
34 ≤ tn ≤ 75 60 ≤ bn ≤ 300
TR26 5 520 000 Requirements for grading: - Air temperature between + 10 °C and + 50 °C; - Relative humidity in the air < 85 %; - Timber temperature > - 10 °C; - Timber mean moisture content between 10 % and 16 %. Dynagrade - Conveyor speed:
≤ 1 m/s; - S
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