Slabs Database
The following table summarizes the main characteristics of each slab system. The data in this table is queried and displayed by the software. The sources can be found on the reference page.
Floor type |
Materials |
Description |
Way of carrying |
Span width low [m] |
Span width high [m] |
Additional measures when installing |
Prefab? |
Continuous slab? |
Building systems integratable? |
Fire |
Substructure |
Prone to vibration |
Environment |
Construction time |
Flexibility |
Flexibility on site |
Flexibility geometry |
Complexity |
Complexity fabrication |
Complexity installation |
Slenderness l/h 3kPa |
Slenderness l/h 4kPa |
Weight [kN/m3] |
Embodied energy [MJ/m3] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Does the main span carry in one or two directions? |
Economically possible |
Economically possible |
Is prefab possible? |
Can you build the slab with supports in middle of the slab? |
Can buildings systems be included into the slab itself? |
Fireresistance without costly measures [min] |
Certain prerequisites necessary? |
General classification including formwork |
Time on site |
Average of the next two |
How flexible is the system to spontaneous changes on site? |
How good can you adapt the slab to complex geometries? |
Average of the next two |
Complexity of floor itself. |
Complexity installation on site |
Applied load (without selfweight) |
Applied load (without selfweight) |
per m2 and total height of slab |
per m2 and total height of slab |
|||||
1 to 5 terrible to very good |
1 to 5 very slow to very fast |
1 to 5 |
1 to 5 terrible to very good |
1 to 5 not at all to very easy |
1 to 5 |
1 to 5 very complicated to very simple |
1 to 5 very complicated to very simple |
Residential building |
Office building |
|||||||||||||||
Flat Slab |
concrete cast in situ_reinforcing steel_posttensioning possible |
The normal one |
two way slab |
0 |
10 |
formwork_propping up |
no |
yes |
yes |
90 |
no |
no |
2 |
2 |
5 |
5 |
5 |
3 |
3 |
3 |
25 |
25 |
25 |
5948 |
Ribbed Slab |
concrete_prestressed strands or reinforcing steel |
ribbs give slab higher siffness and strength to span bigger distances can be prestressed for even higher stiffness |
one way slab |
7 |
14 |
formwork_propping up |
yes/no |
yes |
yes |
60 |
no |
no |
2 |
1 |
3.5 |
4 |
3 |
2 |
2 |
2 |
19 |
18 |
8.5 |
2056 |
Waffle Slab |
concrete_prestressed strands or reinforcing steel |
ribbed slab in 2 directions |
two way slab |
7 |
15 |
formwork_propping up |
yes/no |
no |
yes |
60 |
no |
no |
2 |
1 |
4 |
4 |
4 |
2 |
2 |
2 |
22 |
21 |
11.2 |
2677 |
Hollow Core |
concrete C45/55 precast_70% prestressed strands 1770N/mm^2 |
precast slab with longitudinal holes to save weight carries like several I-beams |
one way slab |
5 |
18 |
cranage |
yes |
no |
no |
90 |
yes |
no |
3 |
5 |
1 |
1 |
1 |
4 |
3 |
5 |
45 |
43 |
14.5 |
3164 |
Composite Solid Prestressed Soffit Slabs |
concrete C45/55 precast_concrete C30/37 in situ_70% prestressed strands 1770N/mm^2 |
precast slab with cast in place concrete above without rebars |
one way slab |
3 |
12 |
propping up |
yes |
no |
no |
60 |
yes |
no |
3 |
4 |
1 |
1 |
1 |
4 |
3 |
5 |
42 |
40 |
24 |
6634 |
Composite Lattice Prestressed Soffit Slabs |
concrete C45/55 precast_concrete C30/37 in situ_reinforcing steel 500N/mm^2 |
precast slab with upper rebars carrying as truss in buiding stage |
one way slab |
3 |
9 |
propping up_Cranage |
yes |
yes |
no |
60 |
yes |
no |
3 |
3 |
2 |
3 |
1 |
3.5 |
3 |
4 |
30 |
28 |
25 |
6291 |
Precast Double-tees |
concrete C50/60_70% prestressed strands 1770N/mm^2 |
precast double T girder as floorsystem loadsharing activated using welded shear connectors |
one way slab |
5 |
22 |
cranage |
yes |
no |
no |
120 |
yes |
no |
4 |
4 |
1 |
1 |
1 |
3.5 |
3 |
4 |
26 |
25 |
4.3 |
734 |
Steel-Concrete Composite Slab |
concrete (from C20/25 to C50/60 possible)_structural steel_reinforcing steel_steel decking |
steel beam carrying steeldecking that acts as lost formwork for in sito concrete slab above |
one way slab |
4 |
10 |
decking_shear stud_maybe propping |
yes/no |
yes |
yes |
60 |
no |
no |
2 |
3 |
2.5 |
3 |
2 |
3 |
3 |
3 |
20 |
20 |
7.5 |
4400 |
Timber-Concrete Composite Slab |
concrete_timber_reinforcing steel |
timber lost formwork with in situ concrete cast above connection by kerbs nails |
one way slab |
0 |
8.5 |
decking_cranage |
yes/no |
yes |
no |
60 |
no |
yes |
4 |
3 |
3.5 |
3 |
4 |
3 |
2 |
4 |
20 |
20 |
7 |
1223 |
Holedeck |
concrete_reinforcing steel_prestressed strands |
similar to two-way waffle slab but with holes in it |
two way slab |
5 |
12 |
special formwork_propping up |
no |
yes |
yes |
120 |
no |
no |
3 |
2 |
3 |
3 |
3 |
3 |
3 |
3 |
22 |
20 |
5 |
1041 |
Slim-Floor |
concrete_steel beam_steel decking_reinforcing steel |
steel beam integrated into concrete slab steeldecking as lost formwork |
one way slab |
6 |
13 |
cranage |
no |
yes |
no |
60 |
no |
no |
2 |
3 |
3 |
3 |
3 |
3 |
3 |
3 |
25 |
25 |
18 |
5948 |
Voided Biaxial Slabs |
concrete_reinforcement_voided elements |
hollow elements to reduce weight for rather thick slabs |
two way slab |
5 |
15 |
formwork_propping up |
no |
yes |
yes |
120 |
no |
no |
3 |
2 |
4.5 |
5 |
4 |
3 |
3 |
3 |
33 |
31 |
18 |
4200 |
Laminated Timber Slab |
laminated timber |
laminated timber combined with shear keys |
one way slab |
2 |
10 |
cranage |
yes |
yes |
no |
60 |
yes |
yes |
5 |
5 |
3 |
3 |
3 |
4.5 |
4 |
5 |
36 |
35 |
3.8 |
1300 |