Does construction grout or stucco have strength to hold Tapcon screws?

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Old 03-11-13, 07:58 PM
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Does construction grout or stucco have strength to hold Tapcon screws?

I have a few sections of 8" concrete block wall that were damaged by previous remodeling, sections removed on one side of the hollow wall for 2" or 3" PVC pipes then later on design changes render those unnecessary.

In order to fix those spots in most cases I tried to patch with wood form and regular concrete. However some places are more tricky and depending on the situation I used either:

Flowable construction grout
[ATTACH=CONFIG]10138[/ATTACH]

or Stucco mix

[ATTACH=CONFIG]10139[/ATTACH]

My question is do these patched surfaces with these products have the strength to accept Tapcon screws?

Yes, I know I can skip over them and look for spots on the concrete walls, my question is IF I CAN'T skip them will they be able to hold Tapcon screws that's supposed to fasten wood furring strips on the wall to accept sheet rock or cement boards?
 
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Old 03-11-13, 09:55 PM
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If you're a gambler, go for it. I know I wouldn't, because I don't like doing things more than one time. Especially if it means tearing out a wall system because the Tapcons failed. Bite the bullet, and buy some real concrete mix.
 
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Old 03-11-13, 11:15 PM
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I have real concrete mix. As I indicated in the original post, I used real concrete mix where I could. There are situations I could not because of obstructions and other reasons I needed something flowable and/or the hole is shallow (less than 1" deep) I end up using construction grout or stucco mix.

So if I need to attach a 1x2 furring strip to a block wall, the strip being 8' tall, and I want to put a Tapcon screw every 12" or so, if say 6 of them are in real block, 2 in grout or stucco patches, is that a potential problem?

It's impossible to use regular concrete in those situations, if it is a problem I probably need to split the strip into two sections, with one section offset to a location away from the patches.
 
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Old 03-11-13, 11:44 PM
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Your mistake was not using concrete. After more than 40 years of pouring (or supervising the placement of) many thousands of yards of concrete, I have NEVER come across a situation where concrete isn't flowable (or wouldn't work), provided proper consolidation methods are used. Quikrete 5000, among others, is perfectly happy in shallow placement situations, and will develop enough compressive strength to hold (lots of) Tapcons.

Care to elaborate on your "special situations?"
 
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Old 03-12-13, 06:55 AM
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Can you post a few pics of the damage? I used to live/work in fla and I'm familiar with how the block houses are constructed. If the strength of the wall hasn't been compromised, patching the holes should be fairly straightforward.
 
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Old 03-12-13, 07:04 AM
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Concrete is structural, grout and stucco are not; I also do not believe this will work.
 
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Old 03-19-13, 03:28 PM
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think about using lead anchors for mortar and grout and some construction adhesive if you have no choice glue your studs down and anchor with tapcon i see no problem for you as long you have 75% your screws in solid cement
 
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