Shower curb height

Discussion in 'Shower & bathtub Forum & Blog' started by Carlosa, Mar 15, 2014.

  1. Carlosa

    Carlosa New Member

    Messages:
    14
    Location:
    Texas
    Ok I am doing my curb with 3 2x4 already installed and with thinset and floor tile it will be about 1 3/4 high from drain.

    -is that enough height or should i add another 2x4

    Also when i do curb with the metal lath is 1/2 inch concrete on top ok or is it too much.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    What are you using to waterproof the shower? Some places want a minimum 2" drop to the drain from the top of the curb, some don't. You need to know what your local inspector wants to avoid hassles. Smaller, even no-curb can work, if the rest of the room is designed properly, but you may have to educate the inspector and this can be risky. The actual total height is up to you and whatever you can get your inspector to approve.

    The actual mortar mix you use on the curb is critical to have it be strong enough - it's not concrete.
  3. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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    3,939
    Location:
    North Vancouver, BC
    Last edited: Mar 17, 2014
  4. Carlosa

    Carlosa New Member

    Messages:
    14
    Location:
    Texas
    well don't know what to use to waterproof yet, so what type of mortar to use for the curb. can I do shower floor first and then do the curb another time?
  5. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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    Location:
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    Shower Curb Height: Bonded or Un-Bonded Shower Curbs

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    What came first? The Chicken or the Egg?
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    You need to first find out what mortar you have access too - then what type of waterproofing you are going to use - and then we can help you answer the first question.

    Do you understand the difference between a bonded membrane and an un-bonded membrane? The low curb showers you might have seen here are all build with a bonded membrane approach.
    Last edited: Mar 17, 2014
  6. Carlosa

    Carlosa New Member

    Messages:
    14
    Location:
    Texas
    Well I have access to Hd n Lowes for mortar and was looking intomRedguard for waterproofing shower.
  7. Justadrip

    Justadrip New Member

    Messages:
    66
    Location:
    New York
    Carlosa....head over to www.johnbridge.com for the best answers for your shower pan, curb and waterproofing questions. More pros to give you the correct answers. This is a great site for plumbing questions. Not so great for tile questions. ;)
  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    The TCNA doesn't say anything about the height of the curb, BUT local building codes generally cover it. For example, this one in California http://santaclaraca.gov/modules/ShowDocument.aspx?documentid=2111 specifically calls out that it must be a MINIMUM or 2" and a MAXIMUM of 11" above the top of the drain.

    While the preslope and setting bed of a conventional shower are usually done with what is called deck mud (a 4-5:1 ratio of sand:portland cement), you need something stronger and stickier to make your curb - pick up a bag of brick mortar for your curb. That can be packed and shaped - remember to put a little slope towards the inside of your shower on the top of the curb.
  9. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

    Messages:
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    Location:
    North Vancouver, BC
    11" shower Curb Height ???

    Carlosa Aren't you asking how much mortar you need over the curb and liner. Not sue what Jim is answering here.

    Maybe I'm wrong but I'm pretty sure the TCNA requires 1 1/4" of mortar over a slip joint. The showers linear considered a slip joint.

    11" would be an insane curb height. No curb should eve be higher than the largest stair riser in a home. I prefer low curbs with bonded membranes. Did you read the idea book I wrote on Houzz,com?

    How to Build a Better Shower Curb

    Here is my last eWarning. eWarning: Hot Dipped Galvanized Wire Mesh


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    Really High Shower Curb Options

    I think this curb is about 14".... lol
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    [​IMG]
    Last edited: Mar 17, 2014
  10. Carlosa

    Carlosa New Member

    Messages:
    14
    Location:
    Texas
    Tnx guys, 1 1/4 inch it will be. Do I need to apply the Redgard on curb even when pan liner is going over the 3 2x4's before the mortar?
  11. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

    Messages:
    3,939
    Location:
    North Vancouver, BC
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    Do you have dam corners installed?

    [​IMG]

    These are about $6.00 each via Noble Company Online Store. If you don't I might hit that area with some of the REDGARD and some kind of reinforcing mesh. Once the mortar that is applied over the curb cures you can coat out the curb top as well.

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    S H O W E R C U R B S

    [​IMG]

    "I didn't want a curb Honey"​
    "Great"
    Last edited: Mar 17, 2014
  12. Carlosa

    Carlosa New Member

    Messages:
    14
    Location:
    Texas
    I will be installing the dam corners, already have them.
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    Per ANSI standards (A108.1A.5.1.4) a one-coat wall mud application should be between 3/8ths" and 3/4ths" in thickness. That is effectively the method you are using when covering the curb with mortar and lath. I wouldn't want to make it out of deckmud, but if you did, it would need to be thicker to hold together, and you'd want the lath in the middle, whereas typically, you put it on the bottom when doing a curb.
  14. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

    Messages:
    3,939
    Location:
    North Vancouver, BC
    Per ANSI standards (A108.1A.5.1.4) a one-coat wall mud application should be between


    This is a floor

    [​IMG]

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    This is a wall

    [​IMG]

    The child is sitting on the floor and drawing on the wall.

  15. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    There's a big difference in the workability and strength of brick mortar and deckmud, and you'll find that brick mortar over a curb can be installed much easier and does not need to be anywhere near as thick as deckmud. If you use deckmud, you'll end up with those huge curbs John hates. If you're going to use that technique, and you've got your studs laying horizontally, you'd have a curb (without tile) 6.5" wide if you use the thickness John states you need using deckmud. That's thicker than the Kerdi foam curb John has stated he hates (because of its size). Brick mortar would be unsuitable for the setting bed...it is a bit sticky and does not have the porosity required to allow moisture to migrate to the weep holes...that's not a big concern on your curb.

    If you want professional, unbiased, help with your shower, I really suggest you try out www.johnbridge.com. They have hundreds of pros there they can tap into to answer questions like this, and they have a significant library (they call it a Liberry) of industry references, how-to's and guidance that will answer most of your questions.

    Or, you can put up with the distractions John Whipple throws in to try to discredit anyone else's suggestions.
  16. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

    Messages:
    3,939
    Location:
    North Vancouver, BC
    Food Testing A Shower - Wrong !!!

    I have learned this weekend that the State of California requires Termite Inspections to include on many occasions the flood testing of a homes shower. This is required by local State Code to be within 1" of the top of the curb. As you can see from this photo (http://www.keytermite.com/images/shower2.gif) that this can cause a miss read of information. A shower's curb built this way would fail a post inspection down the road from a Termite Inspector.


    [​IMG]
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