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-   -   Deck Mud in Fiberglass Shower Pan (https://www.johnbridge.com/vbulletin/showthread.php?t=127527)

Anthocar 05-17-2019 09:46 PM

Deck Mud in Fiberglass Shower Pan
 
Hello,

I got into a situation where a handyman did a shower for me and ended up doing it wrong. I sent him on his way and had someone else take out the mortar and reinstall a preslope + custom fiberglass waterproofing. He told me I needed to find someone to do the mud bed, but after reading this and other forums, I feel relatively confident that I can do that part myself.

Is the process different with fiberglass as compared to other waterproofing method or can I just start building the mud bed?

Do I need to lay down some lath for the deck mud to grab on to?

Lastly, I've seen differing opinions on running cement board down to the mud bed. Some people leave a space to allow moisture to wick and other posts I have seen run cement board down to the slab and build the bud bed into that.

I havent seen much on fiberglass, I was looking around for a few hours. Pardon if this has already been asked.

Davy 05-18-2019 05:22 AM

Hi AC, welcome. You'll need to explain or post a pic of your fiberglass pan. Is this a premade fiberglass pan that sets on the floor inside the shower or did he actually mix his own fiberglass and install it in place of a traditional PVC pan liner?

cx 05-18-2019 06:38 AM

Welcome, AC. :)

And please put a geographic location in your User Profile so we can tell if you're in the People's Republic of Austin, Texas, where fiberglass rules for shower receptors.

Anthocar 05-18-2019 11:32 AM

Thanks! Yep I'm in Austin. It wasn't a prefab, they made the finerglass pan on site. I'm gonna do water tests today. I'll snap a picture in a few.

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cx 05-18-2019 12:07 PM

Quote:

Originally Posted by cx
And please put a geographic location in your User Profile

Or the information will be lost before we leave this page.

What method is being used for waterproofing the walls?

Anthocar 05-18-2019 12:24 PM

Quote:

Originally Posted by cx (Post 1522971)
Or the information will be lost before we leave this page.

What method is being used for waterproofing the walls?

NP, Ill do that as soon as I get back to my comp, I'm on my phone right now. I was gonna run cement board to the floor, tape and thinset the seams, lay the deck mud (above cement board) with proper slope, then redgard over the walls (2 coats)

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Anthocar 05-18-2019 12:43 PM

Here is a pic of the fiberglass they installed. https://uploads.tapatalk-cdn.com/201...9702c9c4c1.jpghttps://uploads.tapatalk-cdn.com/201...7a24fe38b0.jpg

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cx 05-18-2019 01:25 PM

You should already have the proper slope, AC. If not, you want to correct that.

What you want is a final mud bed of consistent thickness of at least 1 1/2 inches following the slope of your floor. You also want to protect the weep holes in your drain before installing the final mud bed, presuming the fiberglass people didn't already clog them, which would also need to be repaired.

Your wall plan is good, so long as you use a true CBU and not a Fiber/Cement board.

My opinion; worth price charged.

Anthocar 05-18-2019 01:56 PM

Great. Thanks for the help. No lath in the fiberglass necessary then? P.S. using hardibacker for the walls

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cx 05-18-2019 02:06 PM

You must not embed Hardiebacker into your final mud bed, AC. That's why I specified a true CBU, something meeting ASTM C-1325 testing requirements. Hardiebacker is a Fiber/Cement board.
Quote:

Originally Posted by AC
No lath in the fiberglass necessary then?

Don't understand the question. Your fiberglass is completed, is it not?

My opinion; worth price charged.

Kman 05-18-2019 03:02 PM

I think he meant above the fiberglass. Is that correct, AC?

If so, then no, you wouldn't use lath there.

Anthocar 05-18-2019 03:08 PM

Yep between fiberglass and deck mud is what I was asking. I've seen countless videos and even more reading and some folks use lath for the deck mud to grab on to. I'll just start packing in the deck mud directly over the fiberglass (after the water test).

Is there a CBU you would recommend? I already have hardibacker up at the top. Can I use CBU at the bottom to salvage the work I've already done?

Thanks again for the guidance.

AC

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Anthocar 05-18-2019 03:09 PM

Here's a pic of the hardibackerhttps://uploads.tapatalk-cdn.com/201...b931b98976.jpg

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cx 05-18-2019 03:22 PM

Problem you'll have there is that most real 1/2" CBUs are 1/2" thick, whereas Hardiebacker 500 (their alleged 1/2" verison) is only about 7/16ths" thick.

Whatever that is smeared on the edges of your existing wallboard is likely gonna be a problem for you, too.

My opinion; worth price charged.

Anthocar 05-18-2019 03:31 PM

Ok so I guess I'll remove everything which is a real pain, but I want it done right... What kind of cbu do you recommend and why is hardibacker not up to par?

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