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How to Waterproof Cement Board
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- Опубліковано 2 бер 2018
- How to Waterproof Cement Board around a bathtub.
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Here are all of the Products used and mentioned in the video (affiliate link):
Laticrete Waterproofing Membrane Fabric - 6" x 75' Roll:
amzn.to/2CetVeT
Nova-Fiber 6"X 75' Roll (The one I used in the Video)
amzn.to/2soNFNp
Laticrete Hydro Ban Mini Unit - 1 Gallon Pail:
amzn.to/2H8NRUr
Redgard Waterproofing, 1 gal
amzn.to/2ss3HG2
My Website:
www.sgtdonovan.com
www.GuardianKY.com
Just a tip, but when installing the fabric, it’s best to start at the bottom and do the tub flange first. Then the vertical corners, and then the horizontal seams last. Otherwise you have all negative laps which could potentially serve as a funnel for water to enter the wall cavity. Granted you added so much liquid membrane that it shouldn’t ever be a problem, but it’s just best practice to only do positive laps when waterproofing. Good job on the video though. 👍
Thnx for the tip
That’s why I like this forum so people can share their knowledge
I never used fabric in mine , I just red guarded all the walls with membrane and let it dry. Then tiled, it works great !
@@lastprophet222 I have seen it done this way as well! I have never seen the fabric used like this. I assume it wont hurt anything !
The fabric is in the instructions to use this system…He’s following the instructions….
Cool video! 👍🏼
You can also apply the liquid membrane to both sides of the lower cement boards before mounting them to the wall. Apply a good amount on the bottom edge. Prevents water from wicking up the cement boards.
Water always wins. We can only slow it down. Every bit of prevention helps.
So, fiber mesh and thinset for cement board joints ... THEN Redgard and fabric tape for waterproofing. I've watched 100 videos and yours is the first to clear that up. Thx Man!
Its overkill. 95% of contractors won't apply fabric over joints already taped and covered with thinset and maybe one out of 100 will waterproof all the way to the ceiling (99 will go as high as the plumbing).
I would recommend doing a minimum of three coats. These paintable waterproofing membranes double as crack prevention membranes when there are enough layers painted on. Helps reduce transmission of cracks in the cement board to the tile.
Liked this video, didn’t know you could waterproof up against the tub flange like that, informative video.
Thanks Chuck
Thank you for sharing this process. I'm a getting this done and it's good to know exactly what should be done so I will be paying attention and make sure this step gets done. When you pay people to do work for you it is best to know what is going on. Thanks
This is helpful. I thought the fabric was only needed for larger gaps and not for small seams, but I could be mistaken. Question: Can construction adhesive be applied directly over the aquadefense once it is cured or will it pull it off? I'm putting up a glue-up surround instead of tile. Or should I just put thinset over the aquadefense?
I need to know this also.🤔
If one imagines no water will EVER be at the very top of the shower tile, that's because one is not the shower cleaner. ;-)
Read this for a 100% leak proof with well over 100 pans experience. Just use felt paper behind durock, start from bottom up, extending it at least 2" over the liner and each consecutive border, Put the durock over it (prefer to do the dry mortar floor butted against felt for the 1st slope prep for the liner, and butted against the liner instead of the durock for the 2nd pre-tile layer with proper protection (rounded edge tools to not cut up the liner), and durock over felt and over floor mud. Then, you just tape the durock and you are 100% good to go with tile. Also, I watched your other vid. putting the rocks around the drain. Its always a good idea to make a collar with fiberglass tape and put it around the drain threads loosely, so the rocks will not risk falling inside the drain in an event you need to remove the drain prior to tile install for at least 2 reasons it can happen. This will save lots of unnecessary expenses and time. Another trick is to how to efficiently prevent the bottom wall bulging due to the liner folds, without using strips. One way is to chisel out the corners to allow for the liner to be flat, and there is an easier method too but I have only tried it as an experiment 2 times with 100% success will leave it for another comment
By felt paper, you mean the black roofing paper, right? And how do you put it behind the durock - do you stick it on with Redgard? And it sounds like you're only waterproofing behind the durock, so the shower is leakproof, but won't the durock itself be holding water if you aren't waterproofing between it and the tile?
This is a nice tutorial, thanks!
These instructions are for waterproofing the cement board, but I have a tub installation question. The flange for my tub looks very similar to yours. It's fiberglass, with some sort of acrylic or other smooth hard finish coat. The install pamphlet recommended using roofing nails, directly into the studs, at the top edge of the flange, so that the bottom half of the nail head just catches the flange. Nothing actually through the flange. That's how I did it. However, every tub install video I watched shows the guys screwing through the flange, and it looks like you did too. What are the pros & cons of screw-through vs. nail over the edge? Also, if you end up recommending that I pull the nails and screw instead, do you countersink a bit first? I like that your tutorial not only shows WHAT you do, but you talk a bit about WHY you do things a certain way.
rmcdaniel423 The way you did it is fine. I wouldn’t change it.
I am watching your tutorials prior to replacing the pan only in a 60 + year old shower. Since all these waterproofing products were not available 60 yeas ago, what has kept this shower from failing until now. As it is, the walls look great with no evidence of leaking, and I am hoping they will look good once I remove the pan.
Tar and tar paper have existed forever - I think that's what you'll find behind most old showers.
The music sounds like something from an early final fantasy game. Makes me all nostalgic, lol.
How did you seal the water shower spout and mixing valve area?
Hi I have watched all your videos and they have been super helpful Thanks!
Thanks! I’m happy they helped!
Good video. I used the Mapei product over cement board in a shower 6 years ago. No problems to date.
I will be installing a new acrylic bathtub in an alcove and will be using Hardiebacker cement board and want to apply Mapei Aquadefense over the backer. Will any spillage harm the finish of the acrylic tub?
Thanks.
Thank you for the video, a couple things on here I did not know that needed done. I have an upcoming bathroom project. I did my other bathroom but did not put a complete tile wall as I am in my 2nd bath. Thanks for the knowledge.
People talk about the cement board holding water and mold forming. What about the thinset it self? Why does the membrane have to be on the cement board? Why can't it be on the green board behind the cement board? If the cement board will hold water, won't the thinset hold water? Seems as long as there's water proofing somewhere between the studs and the thinset, why does the membrane have to be right behind the thinset?
I am putting in a tub surround kit. I was planning on using cement board behind the shower wall panels. The shower panels seem pretty waterproof to me. If I do use cement board behind the panels, will I need to seal/waterproof the cement board?
Did you ever get an answer to your question?
how long does the aqua membrane take to dry. Reason why asking.. i work for special or mental or handy cap homes and they need bathing nearly everyday do to thier condition.!.If need be afyer aqua membries fully can they use shower for quick wash up ,, tile i can get in and tile?.Also can you put modified thinsett over aqua membrane..?
So that waterproofing sticks to that silicon? The reason I ask is because I'm a retired sheetmetal worker and my experience is that silicon sticks to everything but not everything sticks to silicon.
Does thinset and modified thinset both stick to the waterproofing membrane? I’m using large porcelain tiles.
We used Red Gard on Hardiebacker cement board and the manufacturer (Custom Building Products) recommend pro-lite modified thinset....you need to prime the cement board with a diluted 4 to 1 red gard...then 2 or 3 coats of normal red gard...our tile is 12 x 24 in porcelain
@@CyndiLH I used red guard on hardibacker. Large format tiles a
Semper Fidelis brother! Thanks for sharing your knowledge.
Great video! Once you are done and the product has thoroughly dried you can tile right on top of this water proofing product, right? Thank you.
Wow thats what I call waterproofing! Nice work getting ready to upgrade my condo, I am finally buying from my parents been renting for 17 years so much to do. Thanks so much!
Thanks, good luck!
What’s the best way to handle the plumbing penetrations in your method?
Caulk, fabric, and liquid membrane? Or buy schluter’s penetration seals and liquid membrane over the seal fabric?
I’d like to do schluter but it would be at least 6x the cost if not more, and time is not a factor for me.
Thanks for the video
Couldn't I put the waterproofing on before it goes up?at least on bottom portions. ?
I've been looking for a video like this; almost exactly like my set up. Thanks so much
Just found your channel - looking forward to videos on restoration/maintenance of your 150 year old house (as my house is 135 years old with likely the same kind of needs!).
Thanks.. the “old house”related videos are coming soon!
What do you use to initially fill the cement board screws and taped seams? Is it thinset or drywall compound? - thanks.
Could you use a roller to apply the aqua or red guard?
Great tutorial bit but does the membrane affect the tiling process or will the tiling be done in the usual manner.
Why wouldn't a masonry sealer work just as well?It would be a lot faster and can be applied with a garden sprayer.
Great videos!!! This is how I build my showers to.
Thanks!
Hi I'm a carpenter and tiling my bathroom and your videos have very helpful I trust what you say you are very knowledgeable I'm planning my own bathroom remodel and my wife picked out a tile for the strip that is a little thicker than the glazed subway tiles was hoping you could tell me a way to still use them I did my other shower but thickness was the other way around was able to scim coat with mastic any suggestions
I love your explanations. You make it look easy. Hope it comes together as well for me.
Thank you
Very helpful video but do you need to waterproof cement board for FLOOR tiles?
Sgt........................Why do you have to do both, thinset/tape and also hydro ban and fabric?
Hi and Thank you for your good videos! Quick question I used the waterproofing but the the mortar and the tape created bumps a little everywhere along the seems....is this going to be a problem with tiling?
one major suggestion, ensure the backer board is even with or extends past the tub lip even if only a tiny bit.
Nope
@@79TEOG why not? Even the shower pan and tub instructions say to do this. CBU past the flange. Explain if you can.
The durock system was great and easy to work with
i see lots of people doing this in the UK now . my question is what the hell is water doing behind your finished product. and if you should get a broken silicone seal and get a little engress where does this go as it is now trapped between 2 waterproof membranes
Sgt Donovan, I have a question. I am remodeling a bathroom with a marble tile floor. The tile is 1/2 inch thick and has to matchup with existing floor thickness of 1 inch. The USG web site says use 1/4 cement board on floors and 1/2 on walls. Should I use 1/4 exterior grade plywood glued to the subfloor then 1/4 cement board or just use 1/2 cement board under the tile? Thank ou for your advice.
Thank you! Just the video I was looking for.
We have a small part of our shower wall that collapsed. We removed all the tiles and the wet board. Everything around it is dry and solid. We want to use cement board to fix this small area and then apply the new tiles. Is cement board the best to use, what is the best way to waterproof the board? After we waterproof it can we lay the new tiles? Cement board seems a lot cheaper than buying green board which you have to buy in bulk. Love your videos! Thank you
Now I see why many don’t like hardy backer. Way more work than the paper wire mud float. And you can make a flatter surface.
I dont know if it's still true, but years ago, you'd take some "red guard", put it in a small bucket, mix with water to a make a thin first coat. without this thinned down first coat, the product would dry and crack. You'd wait hours between coats, and go for three coats, including the watery first coat. Or....back in the day, I'm not sure, it might have been hot tar (not availiable today), and that stuff was one coat and done. The solution no longer availiable, is the one that lasted the longest.
Really great content Bro! Super helpful, & thanks!
what brand fabric did you use? I cant seem to find it if its the Mapei brand....
How does the water drain out from behind the tile, through the grout?
Hi, i am planning to use the same cement board and membrane that you used, what type of mortar do you recommend I use for my ceramic tiles (small tiles, like 3x6)?
Great instructional video.
Thanks
Hai. I want make a tile. How to on the water roof.
Great Video, now I know the right way to do things! One question:can the blue aqua defense be applied with a roller? I was just thinking that a roller would work faster than a brush.
Yes, you can use a roller.
Does Tile and Thinset adhere to this as well as to the cement board?
Can you use a roller. To apply waterproofing.
I am also planning to do my shower but that's next year. I was actually looking for what product to use to waterproof exterior cement board for stone installation when I came across your video. You seem to know alot about the different brand products and I heard you mention the Laticrete. It is so expensive. Do you happen to know an alternative I could use for the exterior application over exterior cement board or what is also called permaboard? Any help would be greatly appreciated.
You shouldn’t use silicone sealant where you will be placing thinset to adhere tile to. It will not stick. You need to use the sealant recommended for the backer you are using. The rest of the application is fine. Just a note. Nice videos.
The aqua defence is covering the silicone, the thinset will adhere to that, no?
Is there any point to filling in the gap behind the anti-fracture fabric covered with liquid waterproof membrane? If there is a point, what product would you recommend for durock?
U explained in a perfect way! 💖💖💖💖👍👍👍👍
I’m renovating bathroom. Walls down to studs. Just installed bath tub. Now I’m going to put up cement board but I’m stuck. What size do I put up1/2 inch or 1/4 inch on walls? Every UA-cam contractor shows standard is 1/2 inch on walls and1/4 inch on floors. My guy friend who is a diy is telling me that I can put the 1/2 inch but my tile won’t be flush to drywall wall. What do you say?
1/2 inch for sure. The tile should not be flush with the drywall but the cement board will be.
will the tile grout stick if the backerboard is above the tub lip and space behind tile.
Thanks for sharing! This stuff stinks so bad especially when you are working in a closed area. I should be using a fan next time circulate the air.
What’s up Sarge this is good information
Thanks!
Do you need to waterproof cement board? After all you will covering it with thin set and ceramic tiles. Tks. Good video.
Cement board isn't waterproof.
Either is tile
@@dlove118 Tile IS waterproof, but the lines of grout aren't reliably waterproof over time.
Does the liquid membrane inhibit mortar adhesion?
Can Red Guard or the other stuff be used to prevent leaks on a shed made out of Hardie backer board ? I have a couple of small leaks and I was going to try Flex Seal but I figured there must be something stronger.
OK! Gotcha. Now. With this project is tiling going all the way to the top? We are doing partial tile and the rest painted, do we do cement board all the way up?
Jennifer James this one is tile to the top. Only install the cement board where the tile is going. I actually keep it an inch or two below the tile line so the last tile ends on the drywall. It makes it much easier to finish.
SgtDonovan thanks!
Jenny James @
SGT Donovan.. what is the correct protection behind the cement or backer board? I see you used roofing paper, some people use plastic sheeting. The argument is the wall breathing to prevent mold. Everyone has their own ideas but everyone cannot be right. (Between the backer/cement boards and the studs.) Isn't the waterproof membrane enough by itself? (or the Kerdie board?
Keeganzpapa you are 100% correct on basically everything you said. I personally only use roofing paper as a moisture barrier for hardwood flooring. So if you saw it on my wall it was for a different purpose. The plastic on my exterior wall is only required between the actual tub and the wall. I ran it further just because it was there and keeping the insulation protected from drywall dust. I made sure I cut slits all over before I hung the cement board. You are right that they can trap moisture and cause mold. I’ve never seen it applied and used for the purpose of waterproofing, just a building code some places have requiring exterior walls to have a vapor barrier. (No where I live) If any water passes your waterproofing membrane, you have problems. Thanks for the question!
Is it ok to use joint compound to seal the cement board in a shower surround, then put waterproof membrane over that?
No, joint compound should never be used in a shower. It literally will wash away if it gets wet.
Can u paint over cbp 232 waterproof membrane?
great video especially about the fabric. One question I have is, do I need to use a special mortar and grout to stick to the membrane?
This is straight from the manufacturer:
Installing Tile or Stone
• Mapelastic AquaDefense is ready to receive thin-set tile or stone when
dry to touch (after about 30 to 50 minutes). When installing mediumbed mortars (for large tile or stone), screeds (for leveling floors), or
epoxy adhesives, let Mapelastic AquaDefense cure for at least 8 hours.
• For tile and stone intallations, use MAPEI polymer-modified or epoxy
mortars.
As for grout, that is more dependant on the spacing of your tiles and the material they're made of. Such as glass tiles require unsanded grout so you don't scratch the tiles :)
Yes you will need a polymer based mortor to stick your tiles with on top of the rubber membrane (aqua defense)
Great video, thanks! So you use fiber mesh tape for the thinset between the cement board joints, AND you use membrane fabric for the aquadefense? So the seams have both fiber tape and membrane fabric--is that correct?
Yes that is what he did. I think the fabric is overkill. If you do a decent job taping and applying thinset to the joints you will be just fine. In fact that is all that is required in my area. Applying redguard or aqua defense is something extra I do for $50 for piece of mind. I have never not applied some type of waterproofing sealant, but I know people who start tiling after taping joints and thinset and haven't had a problem... YET.
The mesh is to tape the sheet rock like drywall it's been tape it, the membrane is part of the waterproof system, like schluter ditra.
Other UA-cams recommend the fabric at plane changes only.
This video was good. I will say it was definitely on the over kill side though. I've installed showers for 20 yrs. Mesh in the joints with tile mud and Redgaurd is good. If your joints are tight you could just red gaurd with the mesh tape. To apply red gaurd you need to Dilute your first coat with water. It helps with absorption to the HardieBacker, Durock, or green board. Following up with 2 coats just Redgaurd. Once water gets between tile and the wall waterproofing or not. Cleaning the area for repair is calling for cutting out the damaged wall anyways. Repairs are costly and open the wall to have moisture come in or out to the 2x4,s. No need fore the over kill. Big companies push "This is the best way to do it." Ideas to the homeowners to drain the pocket. I mean why not Redgaurd the 2x4,s and back of the sheetrock 2 feet up before doing the shower walls. Mmmm. I'd pay for that.
@@davidmoore8505 how much would you dilute REDGUARD first application on HardieBacker?
How do you seal up wall niches?
Most of the top membrane products say that using fabric is optional.
Nice video. What was the brand of membrane fabric that you used?
Schlueter is by far the best product out there!
Seems so, but a lot more expensive than other methods.
Very helpful. Thanks
Se puede utilizar rodillo....con.brocha es muy.....lento???
Great video.. perfect for exactly what I needed to see. Thanks
same procedure for Hardie backer ? thanks .
What did you use for filling the joints in the backer board. Great video
He had another video for that. It was thin-set mortar with fiberglass tape embedded.
does this liquid membrane bleed? I plan to tile white subway. Why this feels like over kill? may im wrong.
Great video !Very helpful , best one I’ve found thanks
hi how thick is the cement sheets great video will help me reno the laundry into 2nd bathroom do i need to do water proofing around toilet area .
the cement board is 1/2" thick and is called Dura Rock. It should mate up perfectly with any existing drywall or cement board you have. You can find it at Home Depot or Lowes, and it comes in 3'x5' sheets.
you are using a white mesh in fiber or something, please inform the name of this product as we are unable to find similar item here
Excellent video. Thank you.
Question. I'm getting ready to do a shower. I was looking at your shower valve and how far it comes out from the wall or Durock.
Does that black plastic square frame around the valve stick out about the thickness of the tile plus the thinset? Thank you.
Yes. The front face of the plastic frame should sit flush with what you expect will be the finished tile surface.
watched your video on failed shower installs and you stated the water proofing material was best to use and not tape or fibe tape. Which wau isn it.
Thank you Sir.
What about water proofing a nook for soap and shampoo?
Fabric on all seams and a few thick coats of waterproofing. Hope to add a video on that soon.
Great job Amigo👍👍👍👍
Have you used the usg durock liquid membrane and if you have, is it any good? Hooah!
Hey I have an idea! Why don't they make it waterproof at the factory and save us a ton of extra work.
Hi Sgt. Donovan, our builder just put in Fiberock Gypsum Board around the tub that has a flange....but he left a gap between the flange and the gypsum board big enough I can put my fingers in it....should I have him redo it? And what is the difference between Cement board and gypsum board? What is the proper way to waterproof gypsum board? I'm very allergic to mold...so it needs to be done right!!!
If you email me via the contact link on my website with some pictures I’ll be happy to take a look at it. Keep in mind there are different ways to do it so just because it doesn’t look like the video doesn’t mean it’s wrong... I’d also ask him his process for making it waterproof and how it works with the gap he left... and not in a way that implies he is doing it wrong, but give him a chance to explain it to you..
Great job dude. I don't know if you know now or if it is recommended for durock, but you should try diluting the membrane to 1 part membrane and 4 parts water. The cement boards suck up the moisture and leave the membrane to easily peel off the boards.
My tub instructions say to build the walls out 1/4 inch so the the cement board overlaps the flange.
Thanks
Nice work 👍
Thanks!
Thank You Very Helpful information
Can I tile on it after applying the aqua paint
Would you mud and waterproof the seams if you were gonna use frp?
But how did you build the grey cement board seams BEFORE you did the waterproofing and cloth?
With Thin set make sure you use mesh tape as you apply the thinset onto the seams
He has another video showing this
Awesome video! Will construction adhesive applied to Flexstone panels adhere to the waterproofing?
Two questions. Why install the cement board top pieces first instead of the bottom? And, can you apply that blue sealer with a roller first and then brush it out if needed?
Daniel Clark I’ve heard it said that’s it’s so thick that if you do use a roller use a mini one a regular sized one would soak up all the product
I can attest that the stuff is very thick. In a shower it won't take long to brush it on.