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hollycrj 06-12-2011 11:01 AM

major cracks in compound-Hollys tile job
We are building up our bathroom wall to install a shower. The plumbing is done and the frame is up. We just completed the install of the concrete boards and drywall. Now we have started the mudding process.

There is a section on the side that bowed in about a 1/2 inch. I filled that with the compound and smoothed it out. now that it's starting to dry there are major cracks starting to form.

Should i remove all that compound and start over with small applications or can i just wait until it completely drys then put another thinner layer over the top?

Any help you can give is much appreciated. :icon_cheesygrin:

oh'mike 06-12-2011 11:16 AM

There are three or four different types of compound---what type did you use?

hollycrj 06-12-2011 11:22 AM

the tub says All Purpose Joint Compound

hollycrj 06-12-2011 11:22 AM

it's made by Sheet Rock

hollycrj 06-12-2011 11:34 AM

2 Attachment(s)
here are some pics of the cracks. the second pic is sideways

oh'mike 06-12-2011 11:45 AM

Wrong stuff----for filling major areas like that use the bag mix--easy sand 20--45--or 90 minute set.

It shrinks very little and is extremely strong and hard--then top it with a topping compound (light weight-blue lid)

The All purpose that you are using is a setting compound--it contains glue--and is used primarily to set the paper after all cracks and voids have been filled with 20 minute powdered mix.


Bud Cline 06-12-2011 11:48 AM

The wall shown in the above photo ?

Where is that wall in relation to the overall scheme of things?:)

hollycrj 06-12-2011 11:56 AM

@ Mike - so should I try to take it all out and start over with what you suggested or is there a way I can fix it from where I'm at now?

@ Bud - I guess it's really not a wall...just a side piece where the 2x4 frame was.

Sorry for my ignorance guys...I've never done any sort of project before so I'm very naive when it comes to this stuff :)

oh'mike 06-12-2011 12:12 PM

Has it hardened up completely?---You put that on way to thick---

If it's completely hard then you may have success going over it--I'd remove that area---fix the bad stud--re rock it and have it right.

But that's me--I'm fast with drywall.----Mike---

Bud Cline 06-12-2011 12:21 PM


@ Bud - I guess it's really not a wall...just a side piece where the 2x4 frame was.
Makes no sense! You are on site and can see the overall and are intimate with it. We have only a close up of a cracked wall to see.

Where is that wall in the overall scheme of the project?:)

oh'mike 06-12-2011 12:26 PM

Drywall mud should not be used in a wet area like the tub/shower walls---there are other water resistant products used in wet areas.---Mike---

Bud Cline 06-12-2011 12:35 PM

It looks like a knee-wall at a tub surround and that's why I'm asking where this wall is. If it is inside a tub/shower area...all of that fill is worse than regular drywall. Even regular drywall is forbidden in such locations.:)

How about you back up a few feet and take another picture.
We aren't studying micro-organisms here.:)

hollycrj 06-12-2011 02:18 PM

2 Attachment(s)
Ok...this first pic is what it looks like in the tub area. We used cement board with the All purpose compound for the joints.

The second pic is on the side and back where we used drywall in conjuction with the all purpose compound.

We originally had just a knee wall since it was just a tub.

What do you think?

hollycrj 06-12-2011 02:23 PM

take a look at this post...this is what the tub area looked like before we started any work

dberladyn 06-12-2011 02:32 PM


The cracks are fine, it's from the shrinkage that happened as the water evaporated from the compound. Just keep coating it. For the future, 1/2" is really too deep for normal compound, you need a chemically setting compound as a "prefill" but I wouldn't worry about it now. As far as mudding in the shower, well that was a mistake. You shouldn't be putting any drywall based product under the tile. If it ever gets wet it will soften and turn back into wet mud. It's done now I wouldn't worry too much about it. But you can get a waterproof sealer to apply over the top of the mud before you tile to remedy the problem. Should be available at a tile store.


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