Span Rules of Thumb Flashcards

1
Q

Metal decking

A

Spans 1.5’ - 16’ (depends on pan depth/type)

depth = span/24

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2
Q

Light gauge steel joists

A

Spans 10’ - 26’

depth = span/20

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3
Q

Precast concrete: solid flat slab & hollow core slab

A

Spans 12’ - 24’ / 12’ - 40’

depth = span/40

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4
Q

Precast concrete: single tee

A

Spans 30’ - 120’

depth = span/30

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5
Q

Precast concrete: double tee

A

Spans 30’ - 100’

depth = span/28

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6
Q

Precast concrete: rectangular, l-shaped, inverted tee beams

A

Spans 15’ - 75’

depth = span/15

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7
Q

Concrete slab: one-way

A

Spans 6’ - 8’

depth = span / 30

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8
Q

Concrete slab: one-way joist

A

Spans 15’ - 36’

depth = span/24

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9
Q

Concrete slab: two-way with beam

A

Spans 15’ - 40’

depth = perimeter/180

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10
Q

Concrete slab: two-way waffle

A

Spans 24’ - 54’

depth = span/24

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11
Q

Concrete slab: two-way flat plate

A

Spans 12’ - 24’

depth = span/33

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12
Q

Concrete slab: two-way flat slab

A

Spans 20’ - 40’

depth = span/36

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13
Q

Concrete beam cast into slab

A

depth = span/16

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14
Q

Wood dimension lumber joists

A

2x6: spans 0’ - 10’
2x8: spans 8’ - 12’
2x10: spans 10’ - 14’
2x12: spans 12’ - 18’
depth = span/16

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15
Q

Prefab wood joists & trusses

A

I joist: spans 20’ - 60’
Truss: 40’ - 60’
Steel webbed: 60’ - 100’
depth = span/18

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