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Steel Hat Fixing -
Fire attack from both sides / Non-loadbearing & loadbearing

Increase from 60 to 120 minutes fire resistance

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Concrete/Brick Wall Upgrading, Steel Hat Fixing Method

For loadbearing upgrading, the concrete cover to the reinforcing at the non-board side must be of minimum 30mm thick for 120 minutes wall or minimum 50mm thick for 240 minutes wall.

The board thickness of the protection material is relevant to the strength of the concrete and the cover to the reinforcement. In some instances, e.g. high strength (Grade B70), PROMATECT®-H 50mm is needed for a 120 minutes performance to RWS. This situation applies to all exposure curves.

Table 5:
PROMATECT®-H (Steel hat fixing)
Areas of
application		 Concrete/brick thickness x
nominal density		 Increase of
fire resistance		 Board
thickness		 Tests and assessments standards/labs
Concrete/
brick walls		 100mm x 2100kg/m³ From 60 minutes to
120 minutes		 1 x 9mm
(each side)
BS476: Part 21,
BS476: Part 22 and
AS1530: Part 4 Report No.
  • BRANZ 96/876 Issue 2
  • BRANZ 99/1355
  • BRANZ FP 2138
Concrete/
brick walls		 255mm brick
or
75mm brick with
13mm gypsum plaster		 * From 60 minutes to
120 minutes		 1 x 9mm
(each side)
* For Hong Kong only 
 
 
 

Steel hat fixing - Fire attack from both sides / Non-loadbearing & loadbearing
Steel hat fixing - Fire attack from both sides
Fixing details


 
 
 
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