LVL Handbook EUROPE

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2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS
2.3.2 Ridge beams
LVL-P beams can be used as load-bearing main beams of
ridge roofs. As LVL beams are slim, LVL ridge beams are nor-
mally multiple-member beams. Rafters can be supported on
the ridge beam or they can be connected to the sides of the
ridge beam with, e.g., joist hangers. Section 2.2.2 and Figure
2.10. have instructions for the nailing and screwing patterns
of multiple-member LVL beams. In the case of side connec-
tions, nailing or screwing between the LVL plies must be ver-
ified case-specifically.
Calculations according to EN
1995-1-1:2004+A1:2008 and
its Finnish National Annex.
Permanent load is 20% of the
total characteristic load, the
remainder is snow load. Wind
load not included. Service class
1 or 2; consequences class
CC2. Beam has lateral torsional
buckling supports on the top
surface at ≤ 1200 mm spacing
and the loads are located at
the lateral torsional buckling
(LTB) supports. Double beams
are analysed as separate beams
in LTB. Support length shall be
calculated separately. Net final
deflection wnet,fin ≤ L/300. γM = 1,2
Does not replace project-specific
structural design.
Figure 2.34. Capacity table [kN/m] of single-span LVL 48 P ridge beams for predesign.
Figure 2.33. LVL-P ridge beam. Due to the height/thickness ratio
recommendations, LVL ridge beams are usually multiple-member
beams.
0 10 20 30 40 50 60 70 80 90
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
6,5
7,0
7,5
8,0
Characteristic load [kN/m]
Span length [m]
Floor main beams
5x200 45x240 45x260 45x300 45x360 51x 00 63x500 75x200 75x300 75x600
0
5
10
15
20
25
30
35
40
2,0 2,5 3,0 3,5 4,0 4,5
Characterastic load [kN/m]
Maximum span length [m]
LVL 48 P ridge beams h = 200 - 300mm for roofs
45x200
45x240
45x260
45x300
75x200
75x300
2x45x200
2x45x240
2x45x260
2x45x300
0
5
10
15
20
25
30
35
40
45
50
55
60
2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 7,5 8,0
Characterastic load [kN/m]
Maximum span length [m]
LVL 48 P Ridge beams h = 360 - 600mm for roofs
45x360
51x400
63x500
75x600
2x45x360
2x51x400
2x63x500
2x75x600
40
LVL 48 P ridge beams h = 200 - 300mm for roofs
45x200
0
5
10
15
20
25
30
35
40
45
50
55
60
2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 7,5 8,0
Characterastic load [kN/m]
Maximum span length [m]
LVL 48 P Ridge beams h = 360 - 600mm for roofs
45x360
51x400
63x500
75x600
2x45x360
2x51x400
2x63x500
2x75x600
70 LVL Handbook Europe