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Hilti Dx540 - Nails Not Holding In Concrete


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#1 yettiman

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Posted 10 March 2016 - 04:15 PM

Hi,

I am using a Hilti DX450 to fasten metal studding to a concrete floor, but the nails are not holding.

The gun seems to be working perfectly, the nails, NK27's seem to be full inserted into the concrete by the gun, but they simply do not hold. When I try the same nails into a reinforced concrete wall they hold perfectly.

Any thoughts?

Edited by joiner, 18 March 2016 - 10:09 AM.


#2 mrpunter

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Posted 10 March 2016 - 05:17 PM

Maybe an issue with the concrete. When you say metal studding, do you mean track for drywall partition?

#3 jsharris

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Posted 10 March 2016 - 05:53 PM

Sounds like a weak concrete mix to me. Is it a structural concrete slab floor or just a relatively weak screed? My experience with ordinary masonry nails is that they don't fix at all well into weak concrete or mortar, and some screeds are little more than a weak mortar mix.

#4 ConstructionChannel

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Posted 10 March 2016 - 07:37 PM

+1 to the above, my guess is you are fixing to a dry laid screed which just doesnt consolidate the same as poured concrete so the initial shock of the nail is ruining the fixing, plugs and screws should still work or even concrete screws if you were that way inclined,

if you are fixing to poured concrete.......i just don't know why its not working...:(

#5 Onoff

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Posted 11 March 2016 - 12:57 PM

Or Fischer resin.....

http://www.screwfix....sin-360ml/88507

#6 yettiman

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Posted 11 March 2016 - 06:22 PM

Many many thanks, it was a dry pack floor, so that will be be reason.

I will look into using either resin or screw and plug.

Again,

Many many thanks

#7 mrpunter

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Posted 11 March 2016 - 06:56 PM

What are you fixing? It may be that Gripfill etc would be OK?

#8 yettiman

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Posted 12 March 2016 - 09:13 PM

I am fixing metal studding track to a newly laid (3-4 weeks) concrete floor

The Metal studding / framing is for drywall walls..

I was trying to avoid the extra time/labour of having to drill out, clean, ralw plug and screw the track down.

The gun is a new tool for me and I thought it would be an easier option.

Again, many many thanks for everyone's help and comments, very very grateful

Tony

#9 ConstructionChannel

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Posted 12 March 2016 - 09:20 PM

these will be quicker but dearer
http://www.ebay.co.u...0&ul_noapp=true

edit: this was the top link, probably cheaper versions available

Edited by ConstructionChannel, 12 March 2016 - 09:21 PM.


#10 yettiman

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Posted 18 March 2016 - 07:17 AM

Thank you, I tried to find these self tapping concrete screws but they are hard to source in Sicily and I do not have the time to wait the 3-4 weeks it takes for eBay packages to make their way across Italy.

Many many thanks though for the suggestion p, really appreciated

#11 joiner

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Posted 18 March 2016 - 10:11 AM

Have a quiet word with a few mates and ask them to make suppliers an offer they can't refuse? B)