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#7722 02/19/02 12:08 AM
Joined: Dec 2001
Posts: 270
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Elzappr Offline OP
Member
I recall reading somewhere that "nail-in" or "hammer-set" anchors will come loose during a fire. In other words, you shouldn't use them to support electrical conduit and boxes to a concrete ceiling because they aren't rated for fire. But, everybody does. Anyone have the skoop about them?

Joined: Mar 2001
Posts: 2,056
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I know that some lead anchors have restrictions on their use due to the possibility of melting during a fire. But I believe steel is OK.

Joined: Dec 2001
Posts: 270
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Elzappr Offline OP
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I don't think the anchors that I am referring to are made of steel..more like some sort of lead/zinc/? alloy..its pretty soft stuff.

Joined: Dec 2000
Posts: 218
S
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Elzapper, I have not heard about that but it makes sense. Many moons ago when I was involved with the fire service we had major discussions about the metal plates used in truss rafters, seems in a fire they would char the wood around them and would give away with no warning. Most of the anchors are made of a lead-zinc alloy and do have a low melting point though.

Joined: Jul 2001
Posts: 599
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JBD Offline
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For technical information on fasteners go to Powers website at http://www.powers.com/aepdf/AEnew.htm

Joined: Dec 2001
Posts: 270
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Elzappr Offline OP
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I've got a Powers catalog (couldn't use the link you provided because my Acrobat Reader 5.0 isn't working right..freezes my computer up!) and it says that standard Zamac Nailins AREN'T recommended for overhead use. Additionally they state that their Zamac Hammar-Screw can be used for overhead, but only if it is "designed by an engineer who will take the proper design considerations and safety factors into account." Well, nobody does that! What sort of design considerations? Fires?


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