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RE: Cost Effective Mechanical Lap Splice?

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Hi Harold,
The Erico Lenton threaded couplers are the very best, and we use them as well as the Formsavers and Terminators regularly in new construction.  The tapered thread system on the Erico couplers is superb and will fully develop the bars.  I believe Dayton Superior went to a system where they provide the lap dowel with an upset end for their threaded coupler because of what you are saying, but we never specify the threaded Dayton Superior couplers and no-one asks for a substitution.
The Dayton Bar-Lock is actually a non-threaded coupler with a series of interior deformations and then special fasteners that when tightened mold the coupler onto the bar.  The Erico Lenton Lock is similarly a non-threaded alternative coupler.  Since the dowels are existing but insufficient length, a non-threaded solution will be better than trying to thread the bars in the field.  For non-threaded applications we see the Dayton product regularly.  We do not specify non-threaded couplers for typical new construction because they are much bigger and bulkier than the threaded couplers, but for a wall fix they would work quite nicely.
Paul Feather PE, SE

From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Wednesday, December 03, 2008 3:14 PM
To: seaint(--nospam--at)
Subject: RE: Cost Effective Mechanical Lap Splice?

I like the Erico's, but you have to be careful with the Dayton's.  The last I knew, if you required a #5, you had to splice with a #6 because the Dayton threading reduced the cross sectional area of the bar.  The Lenton's use a tapered thread that would develop the full strength of the bar. 
Correct me if this is not accurate today.  It has been a while since I used a Dayton splice.

Regards, Harold Sprague

Subject: RE: Cost Effective Mechanical Lap Splice?
Date: Wed, 3 Dec 2008 11:54:19 -0800
From: PFeather(--nospam--at)
To: seaint(--nospam--at)

Dayton Superior Bar-Lock or Erico Lenton Lock couplers
Paul Feather PE, SE

From: Paul Blomberg [mailto:paul.blomberg(--nospam--at)]
Sent: Wednesday, December 03, 2008 11:36 AM
To: seaint(--nospam--at)
Subject: Re: Cost Effective Mechanical Lap Splice?

If the lap splice length isn't there, perhaps you could go with a mechanical rebar coupler.  If the splice length is close to what is needed, try a higher strength concrete mix and see if the shorter splice length works.

On 12/3/08, Bill Allen <t.w.allen(--nospam--at)> wrote:
I'm working on a project where the contractor has installed too short of a dowel coming out of a footing for a retaining wall. I've considered excess reinforcement, but the required lap is still more than what I have.
What is the most cost effective lap splice?
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509

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