Ask the Expert Question-and-Answer Archive
by Ron Joseph
December, 2004
Intumescent Paint
Q. Using intumescent paint, can I get a 1 hour rating on a steel bar joist/metal
deck roof assembly?
I presume that you can get a 1 hour fire rating by using a qualified intumescent
paint. I suggest that you visit the websites of several manufacturers of intumescent
paint and select only those that have actually performed tests to demonstrate
a 1-hour or longer fire rating.
I cannot vouch for or recommend any particular products, but I am impressed
with information provided at the following websites:
http://www.firefree.com/testassemble.htm
http://www.leighspaints.co.uk/Brochures/NewBrochures/FiretexPassiveFire.pdf
Be aware that once you have applied the paint it must not come into contact
with water, rain, etc., as the active ingredients might leach out of the coating
rendering it less effective.
I strongly suggest that you insure that the product you select has been tested
by the manufacturer for its fire rating. After all, if a fire should occur and
the coating fails to provide the required performance, you will want to be able
to present your insurance company with documentation to demonstrate that you
used a certified product.
Best wishes,
Ron Joseph
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