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Re: Rebar Radar [Re: renosteinke] #215755 07/15/15 08:00 PM
Joined: Apr 2002
Posts: 7,237
HotLine1 Offline
Member
Now there are three votes to call a pro!!

Those expensive diamond core drills go thru anything in any wall I ever encountered.

Sawcutting slabs is a 'ditto'.


John
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Re: Rebar Radar [Re: Potseal] #215756 07/15/15 08:21 PM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
Originally Posted by Potseal


(1) depending on the location we first called in a guy to X-ray the wall or floor



Who does that?

Re: Rebar Radar [Re: renosteinke] #215758 07/15/15 09:27 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline OP
Cat Servant
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Let's not over-think this.

I mean ... X-ray? Really? We're not talking a pre-stressed concrete floor- we're talking about the typical block wall, where we make countless holes for 3/4" EMT daily.

Nor are we likely to contract THOSE holes out. Yet, just 'brushing' against rebar is enough to ruin a good hole.

I haven't put a ruler on the rebar used in block walls, especially for the "bond beam." Heck, it might be 1/2" some of the time .... but it sure isn't 5/8"! That's a pretty hefty rebar, something I only rarely see, and then in substantial foundation pours. That discussion, misses the point: rebar is sure to be a fraction the size of the hole you're trying to make.

This thread was inspired by a series of holes I needed to make for 3" pipe. Invariably, I'd catch the rebar along the edge of the hole. It's a real puzzler when the holes for pipes #1, #2, and #4 sail clear through ... yet hole #3 manages to catch steel along one edge. You can't move that hole, and even a small 'adjustment' is difficult with the bulk of the hole already made.

So far, I don't think anyone has tried that Bosch 'rebar cutter' bit, in any size. Pity. I suppose I'll have to front the $55 and find out firsthand. If I do, I'll be sure to make a report.

Re: Rebar Radar [Re: renosteinke] #215759 07/15/15 10:47 PM
Joined: Jul 2008
Posts: 98
B
brsele Offline
Member
Originally Posted by renosteinke
we're talking about the typical block wall,

Actually, I've never seen a block wall with rebar.
However, around here, the flavor of the day is ICF, which has a lot of 1/2" rebar. And the building inspectors have no problem with making a hole through where there's rebar.

Re: Rebar Radar [Re: renosteinke] #215760 07/15/15 11:22 PM
Joined: Apr 2002
Posts: 7,237
HotLine1 Offline
Member
reno:

OK, time for me to clarify what I said above.....

3" and up holes in concrete (poured) walls (all w/rebar), are what I called the pros for. Also, any saw cutting slabs was left to the pros. (Think a critical hole or cut)

I favored Bosch 'Bulldog' hammer drills, w/SDS bits for holes up to 1". Black & Decker Macho hammer drills for core up to 2". Yes, when the occasional rebar was found, the hole was adjusted as needed, These were not critical holes, so no big deal.

BTW, as Greg said, rebar is common in block walls here; mostly #4 or #5. (1/2"-5/8") Some poured walls have #7, and many spec slabs have #8.



John
Re: Rebar Radar [Re: renosteinke] #215762 07/16/15 04:10 AM
Joined: Jul 2004
Posts: 9,575
G
gfretwell Offline
Member
In Florida the tie beam need 4 #5s, there is one in each doweled cell (corners, both sides of any window or door and every 4' on a running wall) and 2 in the footer. These are all wire tied together to make a matrix.
If the beam is load bearing, you may have four #7s and two #5s. Every one of them is part of the engineered assembly and cutting one is about like cutting truss chords.


[Linked Image from gfretwell.com]


Greg Fretwell
Re: Rebar Radar [Re: renosteinke] #215763 07/16/15 09:34 PM
Joined: Apr 2002
Posts: 7,237
HotLine1 Offline
Member
Greg:
Is this a residential, or commercial??

Looks real heavy duty.


John
Re: Rebar Radar [Re: renosteinke] #215765 07/17/15 01:57 PM
Joined: Jul 2004
Posts: 9,575
G
gfretwell Offline
Member
My house. Florida has a tough building code ... hurricanes.
I imagine the steel in that beam is probably what the engineer would spec anywhere tho. This is carrying the corner of the roof from a column 5' away. I have a 9x9 corner slider there.
A regular tie beam that is only there for uplift will have four #5s.


Greg Fretwell
Re: Rebar Radar [Re: renosteinke] #215775 07/18/15 03:21 AM
Joined: Feb 2013
Posts: 264
Potseal Offline
Member
Like someone already mentioned "rebar in block wall?".

That's new to me, too. I really thought that the OP meant poured concrete with rebar.

Any block wall that I've drilled into there was only one concern and that was hitting conduit or other. Otherwise, draw a circle and use the longest 1/4" bit you can find and drill as many holes as possible. Then knock it out with a hammer.

But if rebar is involved then I can't offer anything since I have yet to encounter block walls with rebar.


A malfunction at the junction
--------------------------------------
Dwayne
Re: Rebar Radar [Re: renosteinke] #215778 07/18/15 04:51 AM
Joined: Jul 2004
Posts: 9,575
G
gfretwell Offline
Member
This is a typical block wall in Florida. The pictures were taken to show the UFER connection but you can see all the "hooks" that will form the rebar matrix when the the hooks are dropped in from above and tied to the bottom hooks.
They paint the Ufer green so that cell doesn't get poured solid like the rest

[Linked Image from gfretwell.com]


Greg Fretwell
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