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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

1286 Fire resistance<br />

STEELWORK IN FIRE<br />

INFORMATION SHEET<br />

This series of information sheets is intended to illustrste methods of achieving fire resistance in steel structures.<br />

It should not be used for design without consulting detailed design guidance referenced below.<br />

THIN FILM INTUMESCENT<br />

COATINGS<br />

METHOD<br />

Most thin film intumescent coatings can be<br />

applied by spray, brush or roller and can achieve<br />

up to 1 hour fire resistance on fully exposed steel<br />

members. Some products can achieve up to 2<br />

hours fire resistance on some section sizes.<br />

PRINCIPLE<br />

Insulation is created by swelling of the coating<br />

at elevated temperatures to generate a foam like<br />

char. This reduces the heating rate so that the<br />

limiting temperature of the steel member is not<br />

exceeded during the required fire resistance<br />

period. The coating thickness necessary<br />

depends on the section factor (Hp/A) and the fire<br />

rating required.<br />

FOR MORE DETAILED INFORMATION SEE:-<br />

"Fire protection of Structural <strong>Steel</strong> in Building"<br />

Publication jointly by:<br />

ASFP - (01252 336318) and<br />

iThe <strong>Steel</strong> Construction Institute - (01344 23345)<br />

UP TO 2 HRS<br />

Thin film of<br />

intumescent coating<br />

ADVANTAGES<br />

a) Decorative finish<br />

b) Rapid application<br />

c) Easy to cover complex details<br />

d) Easy post protection fixings to steelwork<br />

eg service hangers<br />

LIMITATIONS (check with manufacturer)<br />

a) May be suitable for dry internal<br />

environments only<br />

b) May be more expensive than sprayed<br />

insulation<br />

c) May require blast cleaned surface and<br />

compatible primer<br />

Sheet Code<br />

ISF/No.03<br />

January 1997

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