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Old 10-06-2020, 10:36 AM
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Just finished a project for a buddy and need some advice. I've already talked with 2 plumbers who said it's no concern at all. Owner said he spoke to folks as well and not a concern. Me on the other hand is concerned!

As you can see, We installed a sink in his laundry room. I wanted to run everything on outside, buddy said No. This is about 6ft long. The house is a two story, obviously block 1st level, wood frame 2nd level.

Concrete blocks are all filled with poured concrete with fiberglass, very, very dense!
What a major pain in the ass this was, but now all complete.

I think it's a structural concern and should be filled in with more poured concrete. Buddy and 2 plumbers say no, not needed. They've done many without problems.

For those of you who are knowledgeable in this arena please let me know your thoughts before I do anything else.

As always....Thank you



Old 10-06-2020, 10:42 AM
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You've got that 1" strapping there, should be good to go, ha ha.

I'm voting for "it's never going be an issue" but if it was mine, I'd also fill it in with something just in case.

Maybe board up that section and pour some high strength mortar and try to vibrate the heck out of it to help flow as much as possible.

Last edited by Esuomm1; 10-06-2020 at 10:56 AM.
Old 10-06-2020, 10:46 AM
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Originally Posted by spraynet 1 View Post
Just finished a project for a buddy and need some advice. I've already talked with 2 plumbers who said it's no concern at all. Owner said he spoke to folks as well and not a concern. Me on the other hand is concerned!

As you can see, We installed a sink in his laundry room. I wanted to run everything on outside, buddy said No. This is about 6ft long. The house is a two story, obviously block 1st level, wood frame 2nd level.

Concrete blocks are all filled with poured concrete with fiberglass, very, very dense!
What a major pain in the ass this was, but now all complete.

I think it's a structural concern and should be filled in with more poured concrete. Buddy and 2 plumbers say no, not needed. They've done many without problems.

For those of you who are knowledgeable in this arena please let me know your thoughts before I do anything else.

As always....Thank you
Plumbers are the world’s worst about hacking up structural elements and thinking no problem. It is only a problem to them if it falls on their head. I think that wall is already compromised and it will take much more than just a little concrete to get it back
Old 10-06-2020, 10:49 AM
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Itll be hard to encase that in concrete.

How far did you have to chip it out?
Old 10-06-2020, 10:52 AM
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I don't think the horizontal cuts need anything bu there's a pretty big hole where it turns up. Strip the drywall to 4' and replace the strapping with PT plywood.
Old 10-06-2020, 10:55 AM
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You could fill it with flowable grout but it is highly unlikely it is ever an issue.
Old 10-06-2020, 11:06 AM
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Ask a structural engineer, or a foundation specialist, not a plumber.
Old 10-06-2020, 11:09 AM
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Old 10-06-2020, 11:19 AM
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Thanks everyone for your thoughts.

IMHO...it's an issue.

Structural engineer, friend of my buddies that is apparently a THT member saw the picture and knows his buddy was having a friend over to help him. He called my buddy and asked who I was and if I was on THT. Very small world indeed.

The S.E. just sent me a "pm" said zero concern because the entire wall is concrete block poured with high strength fiber fill concrete. Told me just to insulate and put drywall back.

He also took the chance to tell me he's not a fan because of my strong opinions. . Honest I guess!
Old 10-06-2020, 05:35 PM
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The whole wall is concrete block EXCEPT WHERE IT ISN'T! outside wall? Well I guess you have three others!?! Hard to think the wall has structural integrity with so much removed from the wall. That's not the worst job I've ever seen but holy crap that's a hack job and no doubt you're not getting it inspected or pulling permits are you? If you saw that and were looking to buy, wouldn't you say "holy crap, what else is F'ed in this house? Adios!" Well once you cover it up I guess it will just be a surprise bonus. Is there any pitch to that drain pipe? Were these your plumbers




Old 10-06-2020, 05:50 PM
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NO WAY a inspector would pass this! Ask the S.E to give you a letter with his stamp on it saying he stands behind it.
Old 10-06-2020, 05:55 PM
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So when the wall collapses, who's your buddy suing ?
Old 10-06-2020, 06:00 PM
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If the block wasn't needed then why was it there before you hacked the sh*t out of it
Old 10-06-2020, 06:48 PM
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LOL...I guess many of you have suddenly become structural engineers. Please post up you credentials. Lord....
It was a blanket ask though, so I got what I got and that it is that! Who in their right mind would get a permit to install a laundry sink. NONE of you...that's who! The hypocritical is strong on this thread for sure.

The certified structural engineer saw 7 photos of the entire area and said not a concern at all.

Now, although I trust him, I've convinced my buddy to seal the entire area with hydraulic concrete. I'm going to make the forms over the weekend, pour and fill because I can't in good conscious leave it looking like that.

For the record...I hacked nothing, The owner and another friend did that over 3 days with hand chisels. I just completed the plumbing end of it.

Now.....before this thread goes really south.....thanks for all your insight.

Spray out!
Old 10-06-2020, 06:54 PM
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Wall is fine, but, you are correct on cleaning things up so it looks professional. You did check for fall correct?
Old 10-06-2020, 06:55 PM
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I dunno about structurally but it looks like shit... fill it and forget it.
Old 10-06-2020, 09:10 PM
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If you do fill it the pipes need to be wraped in that thin sheet foams fro expansion. This is common with any pipes in concrete. Yoju could wrap the pipes and then fill with fast set cement. I like the PT plywood fix better-shoot it in with nail gun and glue-fixed. Cut a little more rock back 1st. Paint it white and forget
Old 10-07-2020, 04:10 AM
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Originally Posted by onokai View Post
If you do fill it the pipes need to be wraped in that thin sheet foams fro expansion. This is common with any pipes in concrete. Yoju could wrap the pipes and then fill with fast set cement. I like the PT plywood fix better-shoot it in with nail gun and glue-fixed. Cut a little more rock back 1st. Paint it white and forget
This guy is correct, leave room for expansion. And for the record I wasn't pretending to be an engineer just asked a question.
Old 10-07-2020, 06:03 AM
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Cement block is 8" thick, how much is scarfed out? say 4" then the block still has 4" of compressive strength to support along it's 6' of block wall above it and the wood framed second floor. Filled concrete block has great compressive strength and the weight it is supporting is minimal, the real danger is if the stress load becomes lateral then the block could crack and the wall collapse as in a earth quake. I am assuming both ends of the wall are tied in to block walls also along with the top plate for the second floor I would think minimizes any lateral stress loads (except in a earth quake ) Not a structural engineer, just as I see it.
Old 10-07-2020, 06:16 AM
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Originally Posted by good stuff View Post
no way a inspector would pass this! Ask the s.e to give you a letter with his stamp on it saying he stands behind it.
this!

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