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Unread 10-30-2005, 10:01 PM   #1
MomTo2
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SOS!!! Should I rip out CBU and start over?

EEK! My husband decided to be a sweetheart and help me, so that I could finish this granite countertop quicker. To make a long story short, I screwed and nailed down 2 3/4" pieces of plywod. My hubby mixed the Laticrete 2?? (good stuff), put it on top, then applied the backerboard on top. (He used a carpeted board to "pound" it down.... After 3 hours, he screwed down the CBU (HardiBoard).

Now, I look at it, and there are "gaps" along the edges between the plywood and the CBU.... hubby claimed that was good that the thinset didn't run down the edges.....

I'm worried.... I don't want to screw up the first step... Advice is desperately needed!!!

Thanks.
Melody
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Unread 10-30-2005, 10:09 PM   #2
muskymike
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Hi Melody, as long as the cbu was embedded in the mud it should be fine. He should have screwed it right away.
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Unread 10-30-2005, 10:12 PM   #3
stullis
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Any reason he didn't screw it down right away? You may be okay but then again he may have caused bonding problems.
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Unread 10-31-2005, 12:14 AM   #4
MomTo2
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CBU & thinset

Thanks, Scott & MIke...

>>>Any reason he didn't screw it down right away?
Ummmm.... I think it was something having to do with dinner! And then he got distracted with the kids. (I asked him about it, and he said he thought it was OK because of "pounding" on it with the beater board.)

He's arguing with me now about whether to rip it up. (He claims it's "Not going anywhere! It's solid!") I then made put more screws around the perimeter (every 2-3 inches), hoping that would overcome the problem.

I'm also afraid he did not use enough thinset. He used about 1/2 the amount that the bag said to use (per square foot).

Please advise -- thanks again.

Melody
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Unread 10-31-2005, 07:55 AM   #5
Shaughnn
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Hi Melody,
Patch things up with your husband because it's not that bad. The recommended amounts of thinset are for setting tile, which needs 100% coverage and a complete bond. Seating your Hardibacker isn't nearly so critical as your aim is to provide a consistant bed and eliminate possible voids between the CBU and the plywood. Unless you plan to do some table-dancing on this counter top (We don't need to know, actually ), any small voids left from inadequate thin-set coverage still won't be a problem. You want your top to be SOLID, and that's all. If it flexes when you put a load on it (which I doubt will happen with your double-layer of plywood) then you might consider re-installing the CBU after reinforcing the plywood.
In the future though, the CBU doesn't need to be beat on with a carpeted board. Simply comb out the thin-set and screw/nail the CBU in place. The pressure of the screws/nails will be all that you need to seat the CBU unless your thin-set is mixed too stiff.
Now get to work on that granite and send us some photos,
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Unread 10-31-2005, 08:08 AM   #6
davem
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It wouldn't hurt a bit to mix up a small batch of thinset and smoosh it into the gaps you see. Might not be necessary, but it would make me feel better.
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Unread 11-01-2005, 08:40 PM   #7
MomTo2
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Thanks Dave & Shaugnn :smile:

After a good night's sleep and your reassuring words, I feel better. (My hubby thanks you too... he didn't have to sleep in the garage!)

BTW, I told my hubby about all of your replies, and he was SOOOO impressed at, not only the quality of the responses, but the response time.

Kudos!

Melody
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Unread 11-01-2005, 10:06 PM   #8
Shaughnn
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Melody,
Put him on here to ask his won questions. We'd love to meet him too.
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