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nail in anchors during fire #7722 02/19/02 12:08 AM
Joined: Dec 2001
Posts: 270
Elzappr Offline OP
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?

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Re: nail in anchors during fire #7723 02/19/02 08:15 AM
Joined: Mar 2001
Posts: 2,056
Redsy Offline
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.

Re: nail in anchors during fire #7724 02/19/02 07:19 PM
Joined: Dec 2001
Posts: 270
Elzappr Offline OP
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.

Re: nail in anchors during fire #7725 02/19/02 11:22 PM
Joined: Dec 2000
Posts: 218
spkjpr Offline
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.

Re: nail in anchors during fire #7726 02/20/02 10:11 AM
Joined: Jul 2001
Posts: 599
JBD Offline
For technical information on fasteners go to Powers website at

Re: nail in anchors during fire #7727 02/20/02 06:06 PM
Joined: Dec 2001
Posts: 270
Elzappr Offline OP
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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