FIRE PROTECTION PLASTERING




Structural Steel-Fire Protection

The fire resistance and other properties of Pyrok make it an ideal material for the protection of structural steelwork. There are two basic methods of use.

Its strong direct adhesion to steel means that Pyrok can be sprayed directly onto structural members, unprimed or primed to the company’s recommendations; alternatively the sections can be boxed with expanded metal lath and rendered with sand / cement before coating, Both methods eliminated the need for the normal of 50mm of reinforced concrete, and application time is cut from weeks to hours. Pyrok is not affected by adverse weather conditions once the initial set has taken place, so it can be used on steelwork before cladding of buildings.

The thickness of Pyrok is determined by the duration of fire protection required (fire rating), the ratio of perimeter of section exposed to the cross-sectional area of the steel member (Hp / A)
           
 PYROK THICKNESS TABLE FOR STRUCTURAL STEELWORK
Hp / A UP to
Pyrok CV25
Dry thickness in mm to provide Fire Resistance of
1/2 HR 1 HR 1 1/2 HR 2 HR 3 HR 4HR
30
10
10
10
10
15
24
50
10
10
10
14
21
29
70
10
10
12
17
27
36
90
10
10
14
20
31
42
110
10
10
16
22
34
47
130
10
10
17
24
37
51
150
10
11
18
25
40
54
170
10
12
19
27
42
57
190
10
12
20
28
44
59
210
10
13
21
29
45
--
230
10
13
21
30
47
--
250
10
14
22
31
48
--
270
10
14
23
31
49
--
290
10
14
23
32
50
--
310
10
14
23
33
51
--

Minimum thickness is 10mm.
Linear interpolation is permissible between values of Hp / A.
     
 
 CONCRETE STRUCTURES AND SOFFITS-FIRE PROTECTION

Pyrok can be used to increase the fire protection properties of concrete structures such as multi-storey car parks, bride decks and soffits, particularly in tunnels. The company will supply information on the preparation of concrete surfaces to receive Pyrok.

Pyrok has been specified by leading transport and transit authorities around the world for its suitability in the onerous conditions found in rail, metro, vehicular and subway tunnels and underpasses.
   
 
TABLE 1
Required thickness of
Pyrok CV27 (mm)
Existing
Cover (mm)
Required fire resistance period (Hour)
1/2 1 1 1/2 2

3

 4
10
7
7
8
13
18
23
15
--
7
7
10
15
20
20
--
--
7
8
13
18
25
--
--
--
7
10
15
30
--
--
--
7
8
13
40
--
--
--
--
7
8
50
--
--
--
--
--
7
60
--
--
--
--
--
--
70
--
--
--
--
--
--
REINFORCED CONCRETE
REQUIRED COVER TO STEEL
(Based on comparison with BS8110)


 

 

 

 

 

TABLE 2
Required thickness of
Pyrok CV27 (mm)
Existing
Cover (mm)
Required fire resistance period (Hour)
1/2 1 1 1/2 2

3

 4
10
7
8
10
15
23
28
15
7
7
8
13
20
25
20
--
7
7
10
18
23
25
--
--
7
8
15
20
30
--
--
--
7
13
18
40
--
--
--
--
8
13
50
--
--
--
--
7
8
60
--
--
--
--
--
7
70
--
--
--
--
--
--
PRESTRESSED CONCRETE
REQUIRED COVER TO STEEL
(Based on comparison with BS8110)
TABLE 3
Required thickness of
Pyrok CV27 (mm)
Existing
Slab
Thickness
(mm)
Fire resistance period (Hour)
1/2 1 1 1/2 2

3

 4
75
--
10
18
25
 
 
80
--
8
15
23
35
 
90
--
7
10
18
30
 
100
--
--
7
13
25
35
110
--
--
--
8
20
30
120
--
--
--
7
15
25
130
--
--
--
--
10
20
140
--
--
--
--
7
15
150
--
--
--
--
--
10
160
--
--
--
--
--
7
170
--
--
--
--
--
--
180
--
--
--
--
--
--
SOLID SLABS
SLAB THICKNESS REQUIREMENTS
(Based on comparison with BS8110)
 

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