Help! Hardie Plank Stuck To Concrete Wall - Concrete & Paving - Contractor Talk

Help! Hardie Plank Stuck To Concrete Wall

 
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Old 11-23-2010, 06:45 PM   #1
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Help! Hardie Plank Stuck To Concrete Wall


(or, the trouble in going with the low bidder)

So, I'm a GC building a modern style addition, the feature of which is a 18' high by 30' wide board formed concrete wall. The concrete subcontractor told me that for a wall that large, it would be better to use Hardie boards attached to plywood to get the look of board formed concrete, but with a flatter surface. The wall has a steel beam installed across the top, so it's very important that it is flat and plumb. This sounded like a good idea so we went ahead with it.

You see this coming, right? He neglected to use form oil, and the Hardie, being made of fiber *cement* has now bonded to the wall and does not want to come off. I talked to a sandblaster who said he could blast it if we could get it down to the last 1/32" of siding.

To that end, we've tried a roto hammer with a waffle end, which chewed into the wall too much, and grinders, which work, albeit verrrrry slowly.

Have you seen anything like this before? Any ideas? This is such a disaster now.
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Old 11-23-2010, 07:05 PM   #2
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Re: Help! Hardie Plank Stuck To Concrete Wall


You would actually need to use bond breaker instead of form oil, but it's a little late anyway. Can you get an excavator in there with a smooth bucket and just scrape it off. I'm guessing it's going to need to be sack and patched anyway. either that or some kind of tile scrapping attachment for a roto hammer.

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Old 11-23-2010, 07:13 PM   #3
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Re: Help! Hardie Plank Stuck To Concrete Wall


Have you already paid the concrete sub?
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Old 11-23-2010, 07:38 PM   #4
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Re: Help! Hardie Plank Stuck To Concrete Wall


I've paid for everything up to this point (excavation, faoundation, etc.), but I'm holding onto the final payment, about $40k, until I figure this out.
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Old 11-23-2010, 10:14 PM   #5
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Re: Help! Hardie Plank Stuck To Concrete Wall


Well then, find out how he intends to compensate for his failure to form release on the hardi-board before the pour. What about a power washer?
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Old 11-24-2010, 09:46 AM   #6
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Re: Help! Hardie Plank Stuck To Concrete Wall


Thanks for the tips so far. Tried the power washer and got nowhere. Sub has no ideas on how to fix it and now doesn't want to come back. I'm not sure I'd want him back even if he would come.
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Old 11-24-2010, 12:24 PM   #7
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Re: Help! Hardie Plank Stuck To Concrete Wall


You probably will never get them to publicly admit as to how, buy maybe a Hardie (Rep, engineer etc) may provide some insight as to what will break down their material. What about a mad scientist at U.C. Bezerkley or the Rad Lab? Where is this project, Oakland Hills, Piedmont etc? I saw on your blog you are a crane guy, is Morrow Crane still around (Hayward if I recall). Good Luck.
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Old 11-28-2010, 11:40 PM   #8
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Re: Help! Hardie Plank Stuck To Concrete Wall


Not to sure if this will work for you, but if it were me....I would try hitting it with muratic acid. Starting at the top, attempting to spray the acid on the top seam. I would let it soak for about 2 or 3 minutes then tap the hardie with a hammer or mini sledge to try and push the acid in further. (may even try drilling the hardie and acid the holes) It should eat away at the bond enough to allow you to mechanically break the bond. I would start with a light mixtrue and increase from there. Pay special attention to being careful on above grade concrete, get it washed off and neutralized before continuing with the rest of the wall. Like I said I would try it if it were mine but not sure if it will work.
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Old 11-28-2010, 11:42 PM   #9
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Re: Help! Hardie Plank Stuck To Concrete Wall


Make sure you cover that steel beam if you try the acid.
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Old 11-29-2010, 02:04 AM   #10
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Re: Help! Hardie Plank Stuck To Concrete Wall


Wow, what an incredible pain! From my expereince with a unit of Hardie that wasn't covered properly, water+tiime may be a solution, at least it made that HardiPlank crumble. Can you keep it wet for a day or two, maybe by tarping it and keeping soaker hoses running along the top? Obviously, you should try a sample area, but I'd try that, then hit it with a power washer, or maybe even a scraper.
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Old 10-26-2017, 08:58 PM   #11
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Re: Help! Hardie Plank Stuck To Concrete Wall


Even if you get the boards off... the finish....
Hopefully, one board will come loose to see the damage.
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Old 10-26-2017, 09:09 PM   #12
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by cedarboarder View Post
Even if you get the boards off... the finish....
Hopefully, one board will come loose to see the damage.
Ha ha ha, still there after 7 years.

Andy.
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Old 10-26-2017, 09:11 PM   #13
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by ScipioAfricanus View Post
Ha ha ha, still there after 7 years.

Andy.
my bad I didn't look at the date on this thread...

wonder how this mess turned out...
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Old 10-26-2017, 10:45 PM   #14
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Re: Help! Hardie Plank Stuck To Concrete Wall


How did you come across this thread? I always wonder when someone answers a long dead post.
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Old 10-26-2017, 10:57 PM   #15
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by cedarboarder View Post
Even if you get the boards off... the finish....
Hopefully, one board will come loose to see the damage.
You do realize this post is 7 years old. Think we have all done it ,respond to an old posting. It would of been nice to hear back how the problem got fixed though.
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Old 10-26-2017, 11:37 PM   #16
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by Randy Bush View Post
You do realize this post is 7 years old. Think we have all done it ,respond to an old posting. It would of been nice to hear back how the problem got fixed though.
It cost him EVERYTHING to fix it. Now he's out of business.
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Old 10-26-2017, 11:47 PM   #17
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Re: Help! Hardie Plank Stuck To Concrete Wall


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It cost him EVERYTHING to fix it. Now he's out of business.
maybe he just left them on the wall....
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Old 10-26-2017, 11:59 PM   #18
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by cedarboarder View Post
maybe he just left them on the wall....
Maybe?.
Be nice if the OP came back and told us what happened.
Seriously, I'm curious of this out come.
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Old 11-22-2017, 08:11 PM   #19
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Re: Help! Hardie Plank Stuck To Concrete Wall


Quote:
Originally Posted by VinylHanger View Post
How did you come across this thread? I always wonder when someone answers a long dead post.
Took me a while to find out, was in the recommended threads after posting.

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