[TowerTalk] Tack welding rebar, need howto

Jim Lux jimlux at earthlink.net
Sat Jan 4 09:52:39 EST 2014

On 1/4/14 6:02 AM, Patrick Greenlee wrote:
> A very robust cage you have there, David.  Could you site where the 40
> times diameter is written?  I learned by watching and asking questions
> of contractors and was told 25 times diameter by more than one and no
> other value. I will have to look for a reference as I have no alternate
> experience. Thanks for mentioning 40 as that provides incentive to do
> some research. Oh by the way... although I demand code or better
> whenever possible in all endeavors the only inspection I have had
> building two houses and installing a tower has been by the DEQ
> (Department of Environmental Quality) who inspect and permit septic
> systems (my installer was lisc to self inspect.)

googling "rebar overlap" or "rebar lap splice" turns up a wealth of 
conflicting information.

You might look at UBC 1912.1-1912.15

Apparently the 40xdiameter is an older rule of thumb/code and modern 
codes vary the length of splice depending on the kind of steel, strength 
of concrete, application, amount of concrete cover, and spacing of the bars.

There's also differences depending on the year of the code and what the 
application is (e.g. rebar in a masonry wall footing might be different 
than in a flat slab might be different than in a poured concrete wall, etc.)

Here's a chart
they talk a lot about complying with code, but don't say which one.

Here's a whole handbook on splicing:

Page 10 has what you're looking for.

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