EN ISO

9001

NOVING Ltd.
lehlova 108/1
700 30 Ostrava Hrabvka
Czech Republic
TEL., FAX: +420 595 782 426 7
E-MAIL: noving@noving.cz
http://www.noving.cz

FLOOR GRATINGS
DIRECTION 01

Version nr. S01. 007A

Ing. Martina Gallov

Dr. Ing. Tom Novotn

Types of Floor Gratings

Floor gratings consist of bearing rods and connecting rods. Grating types:
welded gratings (connecting rods are welded to bearing rods)
pressed gratings (connecting rods are connected to bearing rods by pressing)
stainless gratings (kind of pressed gratings produced of stainless steel)
All the above-mentioned kinds are custom made, the dimensions and sizes are
determined by the specific need of each customer, and they are also fulfilling the
requirements of DIN 24 537 standard.

Usage
Gratings find numerous applications, namely in the following areas:
access steelworks in industrial facilities and power engineering
passages of overhead cranes and crane tracks
passages along pipelines and tanks
bridge flooring
covering of drains, manholes or channels
stair treads
The main advantages of floor gratings include easy floor cleaning, high load capacity
with low weight, easy assembly and disassembly.

Surface Protection and Supplementary Production

Floor gratings and stair treads are supplied:
raw without surface protection
painted
with surface protection by hot dipped galvanizing according to DIN 50 976
NOVING Ltd. supplies also stair treads according to DIN 24 531, spiral flights, and
connecting material (grating clips).

Contents
Welded Gratings According to DIN 24 537 ___________________________________ 3
Pressed Gratings According to DIN 24 537 ___________________________________ 7
Stainless Gratings According to DIN 24 537 _________________________________ 11
Special Gratings According to DIN 24 537___________________________________ 13
Grating Type Selection___________________________________________________ 13
Construction Details _____________________________________________________ 15
Tolerances of Dimensions According to SN 73 2611 _________________________ 17
Stair Treads According to DIN 24 531 ______________________________________ 19
Spiral Flight____________________________________________________________ 22
Order _________________________________________________________________ 23

PAGE 2

FLOOR GRATINGS DIRECTION

Welded Gratings According to DIN 24 537

Description

Sample description:

SP 30 x 30 A A / 30 x 3 / 900 x 1000

w idth
leng th (sp an)
bearing rod thickness t
b earing rod height h
mesh ty pe
gratin g type

NOVING

S.R.O.

, lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 3

Term explanation
Length / Span

The size of grating in the direction of bearing rods. It

corresponds to the span of supports. It is placed first in the
description of grating size.

Width

The size of grating in the direction perpendicular to bearing

rods.

Recommended width

The width, which does not require longitudinal framing.

(Concerns welded gratings only.)

208, 242, 276, 311, 345, 379, 414, 448, 482, 517, 551, 585,
Recommended widths
619, 654, 688, 722, 757, 791, 825, 860, 894, 928, 962, 997
for supporting rod 2 mm
(nominal width 1 m)
209, 243, 277, 312, 346, 380, 415, 449, 483, 518, 552, 586,
Recommended widths
620, 655, 689, 723, 758, 792, 826, 861, 895, 929, 963, 998
for supporting rod 3 mm
(nominal width 1 m)
For ordering it is recommended to use the nominal width 1000 mm as much as
possible. The real width is then 1000 +0-4 mm.

Mesh types
Mesh type

Real rod distance (AxB)

30 x 30 AA

34,3 x 38, 1

30 x 45 AC

34,3 x 50,8

30 x 70 AE

34,3 x 76,2

30 x 100 AH

30,2 x 101,6

40 x 100 BH

41,5 x 101,6

Bearing rod types

-

25 x 2

30 x 2

40 x 2

20 x 3

25 x 3

30 x 3

40 x 3

30 x 5

40 x 5

50 x 5

60 x 5

70 x 5

80 x 5

PAGE 4

FLOOR GRATINGS DIRECTION

Load table
# * 500

600

700

21,60
2,3
2,15
2,1
31,10
1,9
3,05
1,7
55,20
1,4
5,35
1,3

15,85
3,1
1,80
2,8
22,85
2,6
2,55
2,3
40,60
1,9
4,45
1,7

Length, span of supports [mm]

800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
Mesh type 30 x 30 AA (nominal mesh size 30 x 30 mm, real mesh size 34,3 x 38,1 mm)
12,15 9,60 7,75 6,40 5,40
4,1
5,1
6,3
7,7
9,1
1,50 1,35 1,20 1,05 1,00
3,6
4,5
5,5
6,7
7,8
17,50 13,80 11,20 9,25 7,75 6,60 5,70 5,00 3,4
4,3
5,3
6,4
7,6
8,9 10,4 11,9 2,20 1,90 1,70 1,50 1,40 1,30 1,20 1,10 3,0
3,8
4,6
5,5
6,6
7,6
8,8 10,1 31,10 24,55 19,90 16,45 13,80 11,80 10,15 8,85 7,75 6,90 6,15 5,50 5,00 2,5
3,2
4,0
4,8
5,7
6,7
7,8 0,89 10,2 11,5 12,9 14,3 15,9 3,80 3,35 2,95 2,65 2,40 2,25 2,05 1,90 1,80 1,65 1,60 1,50 1,40 2,3
2,8
3,5
4,2
4,9
5,8
6,6 0,76 8,6 9,6 10,8 12,0 13,3 -

q
25
f
x
2 P
f1
q
30
f
x
2 P
f1
q
40
f
x
2 P
f1

31,05
1,6
2,65
1,5
44,75
1,3
3,80
1,2
79,55
1,0
6,70
0,9

q
25
f
x
3 P
f1

46,60 32,40 23,80 18,20 14,40 11,65 9,60

1,6
2,3
3,1
4,1
5,1
6,4
7,7
4,00 3,20 2,65 2,30 2,00 1,80 1,60
2,1
2,8
3,6
4,5
5,5
6,7
1,5

q 67,10 46,6 34,25

30
1,9
2,6
f 1,3
x
3 P 5,70 4,60 3,80
1,7
2,3
f1 1,2
q 119,30 82,85 60,90
40
1,4
1,9
f 1,0
x
3 P 10,00 8,00 6,70
1,3
1,7
f1 0,9
q 111,85 77,65 57,05
30
1,9
2,6
f 1,3
x
5 P 9,55 7,65 6,35
1,7
2,3
f1 1,2
q 198,85138,10 101,45
40
1,4
1,9
f 1,0
x
5 P 16,70 13,35 11,15
1,3
1,7
f1 0,9

26,20
3,4
3,30
3,0
46,60
2,5
5,70
2,3
43,70
3,4
5,45
3,0
77,65
2,5
9,55
2,3

20,70
4,3
2,85
3,8
36,80
3,2
5,00
2,8
34,50
4,3
4,80
3,8
61,40
3,2
8,35
2,8

16,80
5,3
2,55
4,6
29,80
4,0
4,45
3,5
27,95
5,3
4,25
4,6
49,70
4,0
7,40
3,5

13,90
6,4
2,30
5,5
24,65
4,8
4,00
4,2
23,10
6,4
3,80
5,5
41,10
4,8
6,70
4,2

8,10
9,1
1,45
7,9

6,90
10,7
1,35
9,2

5,95
12,4
1,25
10,6

5,20
14,3
1,15
12,1

11,65
7,6
2,10
6,6
20,70
5,7
3,65
4,9
19,40
7,6
3,50
6,6
34,50
5,7
6,10
4,9

9,90
8,9
1,90
7,7
17,65
6,7
3,35
5,8
16,55
8,9
3,20
7,7
29,40
6,7
5,55
5,7

8,55
10,4
1,75
8,9
15,20
7,8
3,10
6,6
14,25
10,4
2,95
8,8
25,35
78
5,15
6,6

7,45 6,55 5,80 5,20 11,9 13,5 15,3 17,1 1,65 1,50 1,45 1,35 10,1 11,5 12,9 14,4 13,25 11,6510,30 9,20 8,25 7,45 6,75 6,15
8,9 10,2 11,5 12,9 14,3 15,9 17,5 19,2
2,90 2,70 2,50 2,35 2,20 2,10 2,00 1,90
7,6 8,6 9,7 10,8 12,0 13,3 14,6 16,0
12,40 10,90 9,70 8,65 7,75 7,00 6,35 5,80
11,9 13,5 15,3 17,1 19,1 21,2 23,3 25,6
2,70 2,55 2,40 2,25 2,10 2,00 1,90 1,80
10,1 11,5 12,9 14,4 16,0 17,7 19,5 21,4
22,10 19,4017,2015,3513,80 12,4011,3010,30
8,9 10,2 11,5 12,9 14,3 15,9 17,5 19,2
4,75 4,45 4,20 3,95 3,70 3,50 3,35 3,20
7,6 8,6 9,7 10,8 12,0 13,3 14,6 16,0

5,65
21,0
1,80
17,5
5,30
28,0
1,75
23,3
9,40
21,0
3,05
17,5

5,20
22,9
1,70
19,0
8,65
22,9
2,90
19,0

7,95
24,8
2,80
20,6

q 310,70215,80 158,50121,40 95,90 77,70 64,20 53,95 45,95 39,60 34,50 30,3526,9024,0021,50 19,4017,6016,0514,70 13,5012,40
50
1,1
1,5
2,0
2,6
3,2
3,8
4,6
5,4
6,2 7,1 8,1 9,2 10,3 11,5 12,7 14,0 15,4 16,8 18,3 19,8
f 0,8
x
5 P 25,70 20,55 17,10 14,70 12,85 11,40 10,30 9,35 8,55 7,90 7,35 6,85 6,40 6,05 5,70 5,40 5,15 4,90 4,70 4,45 4,30
1,0
1,4
1,8
2,3
2,8
3,3
3,9
4,6
5,3 6,1 6,9 7,8 8,7 9,6 10,6 11,7 12,8 14,0 15,2 16,5
f1 0,7
q 447,40310,70 228,30174,80 138,10 111,85 92,45 77,70 66,20 57,05 49,70 43,7038,7034,5031,00 27,9525,3523,1021,15 19,4017,90
60
1,0
1,3
1,7
2,1
2,6
3,2
3,8
4,5
5,2 6,0 6,8 7,7 8,6 9,6 10,6 11,7 12,8 14,0 15,2 16,5
f 0,7
x
5 P 36,35 29,10 24,25 20,80 18,20 16,15 14,55 13,20 12,10 11,20 10,40 9,70 9,10 8,55 8,10 7,65 7,30 6,90 6,60 6,30 6,05
0,9
1,2
1,5
1,9
2,3
2,8
3,3
3,8
4,4 5,1 5,7 6,5 7,2 8,0 8,9 9,8 10,7 11,7 12,7 13,7
f1 0,6
q 609,00422,90 310,70237,90 187,95 152,25125,80 105,75 90,10 77,70 67,65 59,4552,7047,0042,15 38,0534,5031,4528,80 26,4524,35
70
0,8
1,1
1,4
1,8
2,3
2,7
3,3
3,8
4,4 5,1 5,8 6,6 7,3 8,2 9,1 10,0 11,0 12,0 13,1 14,2
f 0,6
x
5 P 48,70 38,95 32,50 27,85 24,35 21,65 19,50 17,70 16,25 15,00 13,90 13,0012,2011,4510,80 10,25 9,75 9,30 8,85 8,50 8,10
0,7
1,0
1,3
1,6
2,0
2,4
2,8
3,3
3,8 4,3 4,9 5,5 6,2 6,9 7,6 8,4 9,2 10,0 10,9 11,8
f1 0,5
q 795,40552,40 405,85310,70 245,50 198,85164,35 138,10117,70 101,4588,40 77,7068,8061,4055,10 49,7045,1041,1037,60 34,5031,80
80
0,7
1,0
1,3
1,6
2,0
2,4
2,9
3,4
3,9 4,5 5,1 5,7 6,4 7,2 7,9 8,8 9,6 10,5 11,4 12,4
f 0,5
x
5 P 62,50 50,00 41,70 35,70 31,25 27,80 25,00 22,75 20,85 19,25 17,85 16,6515,6014,7013,90 13,1512,5011,9011,35 10,9010,40
0,7
0,9
1,1
1,4
1,7
2,1
2,5
2,9
3,3 3,8 4,3 4,8 5,4 6,0 6,7 7,3 8,0 8,7 9,5 10,3
f1 0,5

Explanations:
# bearing rod [mm]
* q= uniform load in kN/m2, f= deflection in mm from load q
P= point load in kN in the center of grating 200x200 mm, f1= deflection in mm from P
To determine the load of welded gratings with different mesh size it is possible to use the
coefficient w from the following table.
NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 5

Mesh type
Coefficient w

30x30 AA
1,00

30x45 AC
0,95

30x70 AE
0,92

30x100 AH
0,95

40x100 BH
0,72

Weight table
Framed gratings
Mesh
type

30 x 30

30 x 45

PAGE 6

Bearing
rod [mm]

raw

galvanized

weight
[kg/m2]

weight
[kg/m2]

25 x 2

17,0

19,0

30 x 2

19,5

22,0

40 x 2

24,5

27,5

25 x 3

23,5

30 x 3

Framed gratings
Mesh
type

Bearing
rod [mm]

raw

galvanized

weight
[kg/m2]

weight
[kg/m2]

30 x 5

42,5

45,5

40 x 5

55,0

58,5

50 x 5

67,5

72,0

60 x 5

80,0

85,0

25,5

70 x 5

92,5

98,5

27,5

29,5

80 x 5

105,0

112,0

40 x 3

34,5

37,5

25 x 2

15,0

16,5

30 x 5

44,5

47,0

30 x 2

17,5

19,5

40 x 5

57,0

61,0

40 x 2

22,5

25,0

50 x 5

69,5

75,5

25 x 3

21,0

23,0

60 x 5

81,5

88,0

30 x 3

24,5

26,5

70 x 5

94,5

102,0

40 x 3

32,5

35,0

80 x 5

106,5

114,5

30 x 5

41,0

43,5

25 x 2

16,0

17,5

40 x 5

53,5

56,5

30 x 2

18,5

20,5

50 x 5

66,0

70,0

40 x 2

23,5

26,0

60 x 5

78,0

83,5

25 x 3

22,0

24,0

70 x 5

91,0

96,5

30 x 3

26,0

28,5

80 x 5

102,0

110,0

40 x 3

33,5

36,5

FLOOR GRATINGS DIRECTION

30 x 45

30 x 70

Pressed Gratings According to DIN 24 537

Pressed gratings found their applications in industry a well as architectural elements in
interiors, air-conditioning covers etc.

Description

Sample description:

33 x 33 / 30 x 3 / 900 x 1 000

w idth
length (span)
bearing rod thick ness t
bearin g rod height h
mesh type
grating type

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 7

Term explanation
Length / Span

The size of grating in the direction of bearing rods. It

corresponds to the span of supports. It is placed first in the
description of grating size.

Width

The size of grating in the direction perpendicular to bearing

rods.

Mesh types
Mesh type A x B
22 x 11 22 x 22 22 x 33 22 x 44

33 x 11 33 x 22 33 x 33 33 x 44

33 x 66

44 x 11 44 x 22 44 x 33 44 x 44 44 x 55

55 x 55

66 x 66

Bearing rod types

20 x 2

25 x 2

30 x 2

20 x 3

25 x 3

30 x 3

PAGE 8

40 x 2

40 x 3

50 x 3

40 x 4

30 x 5

40 x 5

50 x 5

60 x 5

FLOOR GRATINGS DIRECTION

Load table
Mesh type 33 x 33. Length, span of supports [mm]
# * 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
q 18,45 12,80 9,40 7,20 5,70
20
2,0
2,9
3,9
5,1
6,4
f
x
2 P 1,80 1,45 1,20 1,00 0,90
2,6
3,5
4,5
5,7
f1 1,8
q 28,80 20,00 14,70 11,25 8,90 7,20 5,95 5,00
25
1,6
2,3
3,1
4,1
5,1
6,3
7,7
9,1
f
x
2 P 2,75 2,20 1,85 1,60 1,40 1,25 1,10 1,00
2,1
2,8
3,6
4,5
5,5
6,7 7,9
f1 1,5
q 41,50 28,80 21,15 16,20 12,80 10,35 8,55 7,20 6,15 5,30
30
1,3
1,9
2,6
3,4
4,3
5,3
6,4 7,6 8,9 10,4
x f
2 P 3,95 3,20 2,65 2,25 2,00 1,75 1,60 1,45 1,30 1,20
1,7
2,3
3,0
3,8
4,6
5,5 6,6 7,7 8,8
f1 1,2
q 73,75 51,20 37,60 28,80 22,75 18,45 15,25 12,80 10,90 9,40 8,20 7,20 6,40 5,70 5,10
40
1,0
1,4
1,9
2,5
3,2
4,0
4,8
5,7
6,7
7,8
8,9
10,2
11,5
12,9
14,3
f
x
2 P 6,90 5,55 4,60 3,95 3,45 3,10 2,75 2,50 2,30 2,15 1,98 1,84 1,72 1,63 1,54
1,3
1,7
2,3
2,8
3,5
4,2 4,9 5,7 6,6 7,6 8,6 9,7 10,8 12,0
f1 0,9
q 27,65 19,20 14,10 10,80 8,55 6,90 5,70
20
2,9
3,9
5,1
6,4
7,9
9,6
x f 2,0
3 P 2,70 2,15 1,80 1,55 1,35 1,20 1,05
2,6
3,5
4,5
5,7
6,9
8,3
f1 1,8
q 43,20 30,00 22,05 16,90 13,35 10,80 8,90 7,50 6,40 5,50
25
1,6
2,3
3,1
4,1
5,1
6,4
7,7
9,1
10,7
12,4
f
x
3 P 4,15 3,35 2,80 2,40 2,10 1,85 1,65 1,50 1,40 1,30
2,1
2,8
3,6
4,5
5,5
6,7 7,9 9,2 10,6
f1 1,5
q 62,20 43,20 31,75 24,30 19,20 15,55 12,85 10,80 9,20 7,95 6,90 6,10 5,40
30
1,9
2,6
3,4
4,3
5,3
6,4 7,6 8,9 10,4 11,9 13,5 15,3
x f 1,3
3 P 5,95 4,75 3,95 3,40 3,00 2,65 2,40 2,15 2,00 1,85 1,70 1,60 1,50
1,7
2,3
3,0
3,8
4,6
5,5 6,6 7,7 8,8 10,1 11,5 12,9
f1 1,2
q 110,60 76,80 56,45 43,20 34,15 27,65 22,85 19,20 16,35 14,10 12,30 10,80 9,55 8,55 7,65 6,90 6,30 5,70 5,20
40
1,0
1,4
1,9
2,5
3,2
4,0
4,8 5,7 6,7 7,8 8,9 10,2 11,5 12,9 14,3 15,9 17,5 19,2 21,0
f
x
3 P 10,40 8,30 6,90 5,95 5,20 4,60 4,15 3,75 3,45 3,20 2,95 2,75 2,60 2,45 2,30 2,20 2,05 2,00 1,90
1,3
1,7
2,3
2,8
3,5
4,2 4,9 5,7 6,6 7,6 8,6 9,7 10,8 12,0 13,3 14,6 16,0 17,5
f1 0,9
q 147,50 102,40 75,25 57,60 45,50 36,85 30,45 25,60 21,80 18,80 16,40 14,40 12,75 11,40 10,20 9,20 8,35 7,60 6,95 6,40 5,90
40
1,4
1,9
2,5
3,2
4,0
4,8 5,7 6,7 7,8 8,9 10,2 11,5 12,9 14,3 15,9 17,5 19,2 21,0 22,9 24,8
x f 1,0
4 P 13,80 11,05 9,20 7,90 6,90 6,15 5,55 5,05 4,60 4,25 3,95 3,70 3,45 3,25 3,05 2,90 2,75 2,65 2,50 2,40 2,30
1,3
1,7
2,3
2,8
3,5
4,2 4,9 5,7 6,6 7,6 8,6 9,7 10,8 12,0 13,3 14,6 16,0 17,5 19,0 20,6
f1 0,9
q 103,70 72,00 52,90 40,50 32,00 25,90 21,40 18,00 15,35 13,20 11,50 10,10 8,95 8,00 7,20 6,50 5,90 5,35 4,90
30
1,3
1,9
2,6
3,4
4,3
5,3
6,4 7,6 8,9 10,4 11,9 13,5 15,3 17,1 19,1 21,2 23,3 25,6 28,0
x f
9,70
7,80
6,50
5,55
4,85
4,30
3,90
3,55
3,25
3,00
2,80
2,60
2,45
2,30
2,15
2,05
1,95
1,85
1,75
P
5
1,7
2,3
3,0
3,8
4,6
5,5 6,6 7,7 8,8 10,1 11,5 12,9 14,4 16,0 17,7 19,5 21,4 23,3
f1 1,2
q 184,35 128,00 94,05 72,00 56,90 46,10 38,10 32,00 27,25 23,50 20,50 18,00 15,95 14,20 12,75 11,50 10,45 9,50 8,70 8,00 7,40
40
1,4
1,9
2,5
3,2
4,0
4,8 5,7 6,7 7,8 8,9 10,2 11,5 12,9 14,3 15,9 17,5 19,2 21,0 22,9 24,8
x f 1,0
5 P 17,30 13,80 11,50 9,90 8,65 7,70 6,90 6,30 5,75 5,30 4,95 4,60 4,30 4,05 3,85 3,65 3,45 3,30 3,15 3,00 2,90
1,3
1,7
2,3
2,8
3,5
4,2 4,9 5,7 6,6 7,6 8,6 9,7 10,8 12,0 13,3 14,6 16,0 17,5 19,0 20,6
f1 0,9
q 288,00 200,00 146,95 112,50 88,90 72,00 59,50 50,00 42,60 36,75 32,00 28,10 24,90 22,20 19,95 18,00 16,30 14,85 13,60 12,50 11,50
50
0,8
1,1
1,6
2,0
2,6
3,2
3,8 4,6 5,4 6,2 7,1 8,1 9,2 10,3 11,5 12,7 14,0 15,4 16,8 18,3 19,8
x f
26,50
21,20
17,65
15,15
13,25
11,75
10,60 9,65 8,85 8,15 7,60 7,05 6,60 6,25 5,90 5,60 5,30 5,05 4,80 4,60 4,40
P
5
1,0
1,4
1,8
2,3
2,8
3,3 3,9 4,6 5,3 6,1 6,9 7,7 8,7 9,6 10,6 11,7 12,8 14,0 15,2 16,5
f1 0,7
q 414,75 288,00 211,60 162,00 128,00 103,70 85,70 72,00 61,35 52,90 46,10 40,50 35,90 32,00 28,70 25,90 23,50 21,40 19,60 18,00 16,60
60
1,0
1,3
1,7
2,1
2,6
3,2 3,8 4,5 5,2 6,0 6,8 7,6 8,6 9,6 10,6 11,7 12,8 14,0 15,2 16,5
x f 0,7
5 P 37,45 30,00 24,95 21,40 18,75 16,65 15,00 13,60 12,50 11,55 10,70 10,00 9,35 8,80 8,30 7,90 7,50 7,15 6,80 6,50 6,25
0,9
1,2
1,5
1,9
2,3
2,8 3,3 3,8 4,4 5,1 5,7 6,5 7,2 8,0 8,9 9,8 10,7 11,7 12,7 13,7
f1 0,6

Explanations:
# bearing rod [mm]
* q= uniform load in kN/m2, f= deflection in mm from load q
P= point load in kN in the center of grating 200x200 mm, f1= deflection in mm from P

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 9

To determine the load of pressed gratings with different mesh type it is possible to use the
coefficient w from the following table.
22x11
22x22
22x33
22x44

Mesh type
Coefficient w

1,48

33x11
33x22
33x33
33x44
33x66
1,00

44x11
44x22
44x33
44x44
44x55
0,74

55x55

66x66

0,58

0,52

Weight table
Weight
[kg/m2]

Bearing rod [mm]

Mesh type

20x2

25x2

30x2

40x2

50x2

20x3

25x3

30x3

40x3

50x3

11 x 11

42,9

50,0

57,2

71,5

85,8

57,2

67,9

78,6

100,0

121,5

22 x 11

28,8

32,3

36,0

43,2

50,4

36,0

41,4

46,8

57,7

68,5

22 x 22

21,7

25,3

28,9

36,1

43,4

28,9

34,3

39,7

50,6

61,4

22 x 33

19,4

22,9

26,5

33,8

41,0

26,5

32,0

37,4

48,2

59,1

22 x 44

18,2

21,7

25,4

32,6

39,8

25,4

30,8

36,2

47,1

57,9

33 x 11

24,0

26,5

28,9

33,8

38,6

28,9

32,6

36,2

43,5

50,8

33 x 22

17,0

19,4

21,9

26,7

31,6

21,9

25,5

29,1

36,5

43,8

33 x 33

14,6

17,1

19,5

24,4

29,2

19,5

23,2

26,8

34,1

41,4

33 x 44

13,5

16,9

18,3

23,2

28,1

18,3

22,0

25,6

32,9

40,2

33 x 77

11,9

14,4

16,8

21,7

26,6

16,8

20,5

24,1

31,4

38,8

44 x 11

21,7

23,5

25,4

29,1

32,8

25,4

28,2

30,9

36,5

42,0

44 x 22

14,6

16,5

18,3

22,0

25,7

18,3

21,1

23,9

29,4

34,9

44 x 33

12,3

14,1

16,0

19,7

23,3

16,0

18,7

21,5

27,0

32,6

44 x 44

11,1

12,9

14,8

18,5

22,2

14,8

17,6

20,3

25,9

31,4

44 x 55

10,4

12,2

14,1

17,8

21,5

14,1

16,9

19,6

25,1

30,7

55 x 55

8,9

10,5

11,9

14,9

17,9

11,9

14,2

16,4

20,9

25,4

66 x 66

7,5

8,8

10,1

12,6

15,1

10,1

11,9

13,8

17,6

21,4

99 x 99

5,2

6,0

6,9

8,6

10,4

6,9

8,2

9,5

12,1

14,7

PAGE 10

FLOOR GRATINGS DIRECTION

Stainless Gratings According to DIN 24 537

The construction of stainless gratings is identical to the one of pressed gratings.
Therefore, their properties, such as weight or loading capability are the same as these
of pressed gratings. The only difference between them is used material - stainless steel
according to DIN 1.4301.

Description

Sample description:

P N 33 x 33 / 30 x 3 / 900 x 1 000

w idth
length (span)
bearing rod thick ness t
bearin g rod height h
mesh type
grating type
NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 11

Term explanation
Length / Span

The size of grating in the direction of bearing rods. It

corresponds to the span of supports. It is placed first in the
description of grating size.

Width

The size of grating in the direction perpendicular to bearing

rods.

Mesh types
Mesh type A x B

25 x 25

33 x 11 33 x 16

33 x 33 33 x 66

Bearing rod types

Bearing rods 30 x 2 are produced for all mesh types, rods 30 x 3, 40 x 2, and 40 x 3 are
produced for selected mesh types only.

Load table
To determine the approximate values of load and deflection for stainless gratings, it is
possible to use relevant tables for pressed gratings with the following reduction coefficients:
Load coefficient

0,9

Deflection coefficient

0,9

Weight table
To determine the weight of stainless gratings, relevant tables for pressed gratings may be
employed.

PAGE 12

FLOOR GRATINGS DIRECTION

Special Gratings According to DIN 24 537

Special gratings to be used for slanted areas and bridges or in places with higher danger
of slipping (snow, ice, wetness, oil...). These gratings are produced in order to maximally
increase the friction to ensure safety under the above-mentioned conditions. Employed
kinds of gratings are welded, pressed or stainless gratings.
Special gratings are usually supplied with following bearing rods: 30x3, 40x3. Upon
request it is possible to supply also rods 20x3, 25x3.
Loading capacity of special gratings is 9-24% lower than equivalent normal grating.
Deflections are increased by approximately 4-17%.

Grating Type Selection

Simplified type selection
Under an assumption of support distance 1000 to 1500 mm and permitted
deflection f = 1 / 200, maximum 4 mm, it is possible to choose the dimensions
of bearing rods according to the following table:

Load

Load kind

Presumed load
[kN/m2]

Recommended minimal
dimensions if bearing rods
[mm]

Light

single
person

3,40

30 x 2

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 13

Load

Load kind

Presumed load
[kN/m2]

Recommended minimal
dimensions if bearing rods
[mm]

Middle

pedestrians

3,40 to 4,90

30 x 2
30 x 3

Middle
heavy

transport and storing

of lighter loads

4,90 to 9,80

30 x 3
40 x 2

Heavy

transport and storing

of heavy loads

from 9,80

40 x 3

Max. wheel
heavy trucks and
Transport
pressure as a point
other heavy vehicles
load

40 x 4 and higher

General procedure of type selection

In other cases it is necessary to proceed in a following way:
1. Determine the load to be supported by grating (e.g. using the project
specification, relevant standards or using the table "Simplified Type Selection")
2. Decide the distance of supports, deflection limits or other limiting factors.
3. Select desired grating using the grating load tables.
Example Nr. 1)
Given:
o Sizes:
distance of supports = 800 mm, width = 1000 mm.
o Load:
1200 kg/m2 = 12 kN/m2.
o Requirement:
pressed grating without special requirements.
Solution:
o Using load table for pressed gratings we can find the closest higher
grating: 30 x 2 with loading capability 16,3 kN/m2.
o Order:
Pressed grating P 33 x 33 / 30 x 2 / 860 x 1000
Note: Length is increased as grating should be fixed to supports for distance
equal to the height of bearing rods, at least 30 mm, see construction details.
Example Nr. 2)
Given:
o Load:
not specified, grating is used for pedestrians.
o Sizes:
distance of supports = 1500 mm, width = 1000 mm.
o Requirement: welded grating without special requirements.
Solution:
o Using the table "Simplified Type Selection" we can determine load
approximately 4,9 kN/m2.
o Using load table for welded gratings we can find the closest higher
grating: 30 x 3 with loading capacity 6,72 kN/m2.
o Order:
Welded grating SP 30 x 30 / 30 x 3 / 1560 x 1000
Note: Length is increased as grating should be fixed to supports for distance
equal to the height of bearing rods, at least 30 mm, see construction details.
PAGE 14

FLOOR GRATINGS DIRECTION

Construction Details
Floor gratings are custom made. Thus their size, layout, fixing points etc. are made
according to customers' wishes.

If removing is not presumed, it is possible to use gratings without kerb-type

framing.
For gratings, which should be removable, the usage of gratings with kerb-type
framing is common.
Gratings may contain holes and their shapes may be complex, but these must be
fitted with framing in order to ensure loading capability of grating.
Framing may be of the same thickness as the grating or it may be higher to ensure
safe passage of pedestrians.

Attachment of gratings

In the case of bigger area, it is necessary to prepare grating layout sketch in

advance. The sketch should consider geometrical tolerances of gratings from
+0 mm to -4 mm and construction of supports. The sketch must also show the
direction of bearing rods.
It is possible to use so-called grating stripes, see figure.

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 15

LENGTH (SPAN)

support

support

support
If possible, gratings should be in the direction of bearing rods supported in the length of
at least equal to the height of bearing rods, minimally 30 mm.
Gratings should be attached to supports by means of clips to prevent accidental lifting
or shifting of the grating. The minimal amount of clips is 4 pieces per grating. Surface
protection of all the connecting materials by hot dipped galvanizing corresponds
to DIN 50 976.

Alternatively it is possible to weld the gratings to supports.

Surface protection
Floor gratings and stair treads are supplied:
raw without surface protection
painted
with surface protection by hot dipped galvanizing according to DIN 50 976.
PAGE 16

FLOOR GRATINGS DIRECTION

Tolerances of Dimensions According to SN 73 2611

The following geometrical tolerances are valid for all kinds of welded, pressed as well as
stainless gratings under the following assumptions:
bearing rod up to 60 x 5 mm
mesh size from 11 mm to 68 mm
2
grating area does not exceed 2 m and no grating dimension is greater than 2000 mm

Deflection of bearing rod from vertical plane

gmax = 0,1 x H

Vertical position of connecting rod

connecting rod 6 mm: imax = 1,5 mm
connecting rod 8 mm: imax = 2 mm

Horizontal position of connecting rod

kmax = 0,5 mm

High framing
pmax = 1 mm

Low framing
mmax = 1 mm

Slanted cut of bearing rod

nmax = 0,1 x H

Deflection
length to
600 mm: qmax = 3 mm
length over 600 mm: qmax = 1 / 200 of length

NOVING

S.R.O.

, lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 17

Difference of diagonals
a - b = max. 0,012 x L

Tolerances of holes and shapes

c, e, f = max. +0 mm, -4 mm
g
= max. +/- 1,5 mm
d
= max. +/- 4 mm (measured through 10 cells)
h
= max. +8 mm, -0 mm
i
= max. +8 mm, -0 mm

PAGE 18

FLOOR GRATINGS DIRECTION

Stair Treads According to DIN 24 531

Description

Description of stair treads follows that of gratings.

Sample description - welded stair tread:
Tread SP 30 x 30 AA / 30 x 3 / 800 x 270
Sample description - pressed stair tread:
Tread P 33 x 33 / 30 x 3 / 600 x 240
Sample description - stainless stair tread:
Tread PN 33 x 33 / 30 x 3 / 600 x 240
Mesh types
Mesh sizes and dimensions of bearing rods of stair tread are identical with mesh sizes
and bearing rods dimensions of welded, pressed or stainless gratings.
Recommended mesh type is 30 x 30 AA for welded and 33 x 33 for pressed stair
treads.
NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 19

Bearing rod types

25 x 2

30 x 2

40 x 2

25 x 3

30 x 3

40 x 3

Typical stair tread sizes

L [mm]
600

800

1000

1200

W [mm]

n [mm]

e [mm]

240

120

85

270

150

85

305

180

90

240

120

85

270

150

85

305

180

90

240

120

85

270

150

85

305

180

90

240

120

85

270

150

85

305

180

90

Loading capacity
Single force acting on area 100 x 100 mm in the middle of the tread span is 1500 N.
The choice of grating type for stair threads is subject to the same rules as
grating type selection.

Construction details
Any modifications like holes or cuts within stepping edge rod are not permitted.

Stair tread attachment

Side boards of stair treads are supplied with circular and longitudinal holes for M 12
screws. Each tread should be attached by 4 screws.

The distance of attaching screws may be modified according to customer's needs.

PAGE 20

FLOOR GRATINGS DIRECTION

Surface protection
Stair treads are supplied:
raw without surface protection
painted
with surface protection by hot dipped galvanizing according to DIN 50 976

Tolerances

L = max. +0, -3 mm
W = max. +5, -5 mm
for other see general grating tolerances

Weight table
Tread
length
L [mm]

600

800

1000

1200

Weight of welded hot-dip galvanized tread with bearing rod [mm]

Tread
width
W [mm]

25x2

240

3,90

4,25

4,95

260

4,19

4,58

270

4,34

295

30x2

40x2

25x3

30x3

40x3

4,74

5,26

6,29

5,34

5,12

5,69

6,82

4,74

5,54

5,31

5,91

7,08

4,71

5,15

6,04

5,78

6,44

7,74

305

4,86

5,32

6,23

5,97

6,65

8,00

240

4,90

5,37

6,31

6,04

6,73

8,11

260

5,27

5,79

6,81

6,52

7,28

8,78

270

5,46

5,99

7,06

6,76

7,55

9,12

295

5,92

6,51

7,69

7,36

8,24

9,97

305

6,10

6,72

7,94

7,60

8,51

10,31

240

5,91

6,50

7,67

7,34

8,21

9,92

260

6,36

7,00

8,28

7,92

8,87

10,75

270

6,58

7,25

8,58

8,21

9,20

11,16

295

7,13

7,87

9,34

8,94

10,03

12,20

305

7,35

8,12

9,65

9,23

10,36

12,61

240

6,92

7,62

9,03

8,63

9,68

11,73

260

7,44

8,21

9,74

9,32

10,46

12,71

270

7,70

8,50

10,10

9,66

10,85

13,20

295

8,34

9,23

11,00

10,51

11,83

14,43

305

8,60

9,52

11,36

10,85

12,22

14,92

[kg/piece]

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 21

Spiral Flight
Spiral flights are supplied as modular system. Stair treads and railing elements are designed in such a
way to enable different geometry of flights. Stair treads are attached to the central pipe by screws.

Typ Special plus - Klasic

Railing

Typ Special plus- segment

2 x 14 / M12

Gratings 30x2(3) or
Expanded Sheet
Pipe

PAGE 22

FLOOR GRATINGS DIRECTION

Or

Order
Please, copy and fill this form in. You can submit it by mail, fax or e-mail. Similar form may
be also found on our homepage www.noving.cz for easier sending by e-mail.
Address of customer

Address of supplier
Noving Ltd., U Ndra 27
703 00 Ostrava Vtkovice
Czech Republic
tel., fax: +420 595 782 426 -7
595 783 891
e-mail: noving@noving.cz

account number:

Order Nr. ___________________________ from (date) ______________________

We order the following gratings/stair treads:
Nr.

mesh type

rod type span

Example: 1 welded 30x30 30x2 1000

width
1000

pieces

style/surface protection

32 pieces

framing, galvanized

Clips:

____________________ pieces

Transport by:

_________________________________________________________

Delivery address:

_________________________________________________________
_________________________________________________________
_________________________________________________________

Delivery date:

_________________________________________________________

Way of payment:

_________________________________________________________

Responsible person: _________________________________________________________

NOVING S.R.O. , lehlova 108/1, 700 30 OSTRAVA, CZECH REP.

PAGE 23