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wood beam span  

Wood beam span tables and beam sizes

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Wood beam span tables and beam sizes

How far can beams span?

For determining beam spans (distance a beam can span between supporting posts), consider the following concept. The more weight, or the longer the supported length of joist that a beam must carry, the shorter the span of the beam – for a particular size of beam. Find in the table what beam is required for a particular span. First find how far you need to span, then find a beam size and particular beam size.


Floor wood beam span table for pine beam live load 400 Kg/m2

 span (m)/
distance between beams (m)

2,0

2,5

3,0

4,0

4,5

5,0

6,0

0,6 75x100 75x150 75x200 100x200 100x200 125x200 150x225
1,0 75x150 100x150 100x175 125x200 150x200 150x225 175x250

If you are planning to load wood beams less than 400 kg/m2 you can use another table for less load:

Minimum floor wood beam span

live load, Kg/м2 Wood beam size (mm)/span (m)
3,0
3,5
4,0
4,5
5,0
5,5
6,0
150
50х140
50х160
60х180
80х180
80х200
100х200
100х220
200
50х160
50х180
70х180
70х200
100х200
120х220
140х220
250
60х160
60х180
70х200
100х200
120х200
140х220
160х220
350
70х160
70х180
80х200
100х220
120х220
160х220
200х220

Round dimensional lumber span table:

Mimimum log diameter /span with total live load 400Kg/m2

span between walls, М wood beam span, М log diameter, СМ
2 1 13
0,6 11
2,5 1 15
0,6 13
3 1 17
0,6 14
3,5 1 19
0,6 16
4 1 21
0,6 17
4,5 1 22
0,6 19
5 1 24
0,6 20
5,5 1 25
0,6 21
6 1 27
0,6 23
6,5 1 29
0,6 25
7 1 31
0,6 27
7,5 1 33
0,6 29

Dicslaimer: all wood beam span information provided at that page are for private use only and should be verified by the certified engineer in each case of construction.

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