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Timber Spans > Brick Coursing Metric >  

 

Timber Span Tables
The information below is for guidance use only! Please be advised that a structural engineer should be saught fo advice on structural loading and capacities, please note that these tables cannot be used as proof of span adequacies.
 
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Strutting
Joist Span (m)Rows of Strutting Between Supports
x < 2.5None
2.5 < x > 4.51 at mid span
4.5 < x2 at one third span positions
 
Floor Joists
This table shows C16 Grade, maximum timber spans in (meters) for a dead load of 0.25 - 0.50 kN/m2. For higher grade timbers or different loadings then I guess you will have to look somewhere else.

Size of Joist

(mm)

Spacing of Joists

(mm)

BreadthDepth400450600
38971.71.51.2
381202.32.11.7
381452.82.62.3
381703.33.12.7
381953.73.53.0
382204.23.93.4
47971.91.81.4
471202.52.42.0
471453.02.92.5
471703.53.43.0
471954.03.93.4
472204.54.33.8
63972.22.01.8
631202.72.62.4
631453.33.22.9
631703.93.73.4
631954.44.33.9
632204.94.84.4
751202.92.82.5
751453.53.43.1
751704.13.93.6
751954.74.54.1
752205.15.04.6
 
Ceiling Joists
This table shows C16 Grade, maximum timber spans in (meters) for a dead load of not more than 0.25 kN/m2. For higher grade timbers or different loadings then I guess you will have to look somewhere else.

Size of Joist

(mm)

Spacing of Joists

(mm)

BreadthDepth400450600
38721.1 1.1 1.1
38971.71.71.6
381202.32.22.2
381452.92.92.8
381703.63.63.4
381954.34.24.0
382205.04.94.6
47721.21.21.2
47971.91.91.8
471202.52.52.4
471453.23.23.0
471704.03.93.7
471954.74.64.4
472205.45.35.0
Rafters
This table shows C16 Grade, maximum timber spans in (meters) for a dead load of 0.50 - 0.75 kN/m2 and an imposed load of 0.75 kN/m2 For higher grade timbers or different loadings then I guess you will have to look somewhere else.
15o< xo < 22.5o22.5o< xo < 30o30o< xo < 40o

Size of Rafter

(mm)

Spacing of Rafters

(mm)

Size of Rafter

(mm)

Spacing of Rafters

(mm)

Size of Rafter

(mm)

Spacing of Rafters

(mm)

BreadthDepth400450600BreadthDepth400450600BreadthDepth400450600
381001.91.81.7381002.01.91.8381002.12.01.9
381252.62.52.3381252.72.62.4381252.82.72.5
381503.23.12.8381503.33.22.9381503.43.33.0
471002.22.22.0471002.32.22.1471002.42.32.1
471252.92.82.5471253.02.82.6471253.12.92.7
471503.53.33.0471503.63.43.1471502.73.53.2