FHB Logo Facebook LinkedIn Email Pinterest Twitter X Instagram Tiktok YouTube Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Restoration
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

Schluter system – unmodified thinset?

alhimprov | Posted in General Discussion on September 27, 2007 04:31am

I’m going to be installing a tile shower using the Schluter system.  I have done multiple mud pan tile showers but would like to give this system a try.  I’ve read the install info on Schluter’s website.  My question is why do they specify UNMODIFIED thinset for the install?  I normally use modified thinset.  Any answers would be greatly appreciated.  I think I will post this question on John Bridges site as well.  Thanks in advance.

Reply
  • X
  • facebook
  • linkedin
  • pinterest
  • email
  • add to favorites Log in or Sign up to save your favorite articles

Replies

  1. User avater
    DDay | Sep 27, 2007 05:04am | #1

    Definitely check johnbridge and also do a search here. I believe they want unmodified because the modified takes too long to fully set up. I've used the system and like it a lot. The only learning curve I had was knowing how much area I could cover with the kerdi before thinset started to get too dry. I was doing it in the middle of the summer, so that did not help either. They have a video that is decent and their area sales reps are very good, they call back within a day at the latest.

  2. stevent1 | Sep 27, 2007 05:23am | #2

    allhimprov,

    Schluter recommends the use of the proper thinset for the substrate. I was a guest at CTEF earlier this month at a Schluter seminar.

    Schluter gives a 100% waterproof warranty with proper installation. John Bridge  attended the event.

    The short and sweet:

    Dryset(unmodified) thinset under Kerdi/Ditra on concrete, CBU and sheetrock. Thinset(Modified) under Ditra on plywood. Dryset to adhere tiles to Kerdi and Ditra.

    You want the warranty? Follow Schluters directions.

     

    Here are links to John Bridge and Schluter:

    http://www.johnbridge.com/vbulletin/forumdisplay.php?f=11

    http://www.schluter.com/

    This medallion was set with dryset over Ditra on plywood.

     

    View Image

     

    View Image

    Chuck S

    live, work, build, ...better with wood
    1. mwgaines | Sep 27, 2007 04:38pm | #3

      Chuck,

      Nice work. Did you design and install that medallion yourself? If so, how did you prepare all those challenging angles and cuts. Template?New knowledge is priceless. 

      Used knowledge is even more valuable.

      1. WNYguy | Sep 28, 2007 03:18pm | #10

        Check out Chuck's photo thread.  He did an excellent job of documenting and describing the entire process.  I think the tileword starts about here:

        79773.296

        Scroll forward or backward in the thread as necessary.  Or just go back to post #1.  Well worth it!

        Allen

    2. ClaysWorld | Sep 28, 2007 03:57am | #8

      Nice!

      Are all the blue tapes #s for laying out the pattern after you lay down the mud?

      1. WNYguy | Sep 28, 2007 03:20pm | #11

        Take a look at Chuck's photo thread.  Great photos and explanations of every step.

        The tilework starts about here, the medallion is a few posts later:

        79773.296

        Allen

        1. ClaysWorld | Sep 30, 2007 05:20pm | #13

          Thanks . I had watched that project then kinda let it slip off the radar screen.

          I'm on a project now so I'll have to get back to it later.

          But the ATD is ? impressive.

           

           

  3. User avater
    Mongo | Sep 28, 2007 01:54am | #4

    Unmodified thinet (dry set) cures via a chemical reaction. No air is needed for it to cure.

    The latex modifier in modified thinset need exposure to air to dry.

    If you use modified thinet between ditra or kerdi (both air impermeable) and porcelain tile (also air impermeable), there will be insufficient exposure to free air for the modified part of the mix to dry. The thinset may not fully harden for days...and days.

    Schluter is fairly specific on what thinsets to use for certain applications.

    I think Schluter is direclty responsible for the reintroduction of dry set to a few supply houses, a few years ago dry set was getting somewhat hard to find.

    Mongo

     

  4. Piffin | Sep 28, 2007 02:54am | #5

    They do a very good job of explaining this in their own literture, but the short and sweet is that modxified has to dry whie unmodified will cure whether esposed to air or not

     

     

    Welcome to the
    Taunton University of
    Knowledge FHB Campus at Breaktime.
     where ...
    Excellence is its own reward!

  5. Hackinatit | Sep 28, 2007 03:22am | #6

    After the tile... SpectraLock

    View Image

    This stuff is absolutely amazing! Read the directions, follow them to the letter, and smile for years to come.

    be expensive and worth it.

    "Fortunately, the ideas of individual liberty, private property, freedom of contract and association, personal responsibility and liability, and government power as the primary enemy of liberty and property, will not die out as long as there is a human race, simply because they are true and the truth supports itself."

    Hans-Hermann Hoppe


    Edited 9/27/2007 8:22 pm by Hackinatit



    Edited 9/27/2007 8:23 pm by Hackinatit

    1. jayzog | Sep 28, 2007 03:47am | #7

      You caught my interest, so I googled Spectralock(never had heard of it before).

      About the 3rd hit down was this forum http://www.infotile.com.au/ubb/Forum1/HTML/002450.html

      People on there don't seem to thrilled. I have tried other epoxys before and been less than happy myself, please sell me on why I should try this one.

      Till then I think I'll stick to cement grouts(we have a better understanding).

      1. Hackinatit | Sep 28, 2007 04:33am | #9

        You get:

        View Image

        Pre-measured liquids and solids (from Lowe's) in quantities that allow for the proper cleanup.

        The aggregate has the color, not the cement, and gives you ABSOLUTELY consistent coloration.

        The Laticrete caulks MATCH the grout colors.

        Spreads smoothly.

        Cleans easily (1/2 cup white vinegar to 2 gallons water).

        Won't stain after 7 days' cure time.

        Includes Mildewcide.

        NEVER seal it.... NEVER.

        Downsides:

        Fear

        Cost

         

         

         

         

        "Fortunately, the ideas of individual liberty, private property, freedom of contract and association, personal responsibility and liability, and government power as the primary enemy of liberty and property, will not die out as long as there is a human race, simply because they are true and the truth supports itself."

        Hans-Hermann Hoppe

        Edited 9/27/2007 9:33 pm by Hackinatit

      2. User avater
        BillHartmann | Sep 28, 2007 03:23pm | #12

        Look over at John Bridges. IIRC they generaly like it.
        .
        .
        A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Picture-Perfect Pergola

Built from locally sawn hemlock, this functional outdoor feature uses structural screws and metal connectors for fast, sturdy construction.

Featured Video

Builder’s Advocate: An Interview With Viewrail

Learn more about affordable, modern floating stairs, from design to manufacturing to installation.

Related Stories

  • Design and Build a Pergola
  • Podcast Episode 689: Basement Garages, Compact ERVs, and Safer Paint Stripper
  • FHB Podcast Segment: Are Single-Room ERVs the Answer?
  • Fire-Resistant Landscaping and Home Design Details

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Fine Homebuilding Magazine

  • Issue 332 - July 2025
    • Custom Built-ins With Job-Site Tools
    • Fight House Fires Through Design
    • Making the Move to Multifamily
  • Issue 331 - June 2025
    • A More Resilient Roof
    • Tool Test: You Need a Drywall Sander
    • Ducted vs. Ductless Heat Pumps
  • Issue 330 - April/May 2025
    • Deck Details for Durability
    • FAQs on HPWHs
    • 10 Tips for a Long-Lasting Paint Job
  • Issue 329 - Feb/Mar 2025
    • Smart Foundation for a Small Addition
    • A Kominka Comes West
    • Making Small Kitchens Work
  • Issue 328 - Dec/Jan 2024
    • How a Pro Replaces Columns
    • Passive House 3.0
    • Tool Test: Compact Line Lasers

Fine Home Building

Newsletter Sign-up

  • Fine Homebuilding

    Home building tips, offers, and expert advice in your inbox.

  • Green Building Advisor

    Building science and energy efficiency advice, plus special offers, in your inbox.

  • Old House Journal

    Repair, renovation, and restoration tips, plus special offers, in your inbox.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters

Follow

  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X
  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences
  • About
  • Contact
  • Advertise
  • Careers
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

  • Home Group
  • Antique Trader
  • Arts & Crafts Homes
  • Bank Note Reporter
  • Cabin Life
  • Cuisine at Home
  • Fine Gardening
  • Fine Woodworking
  • Green Building Advisor
  • Garden Gate
  • Horticulture
  • Keep Craft Alive
  • Log Home Living
  • Military Trader/Vehicles
  • Numismatic News
  • Numismaster
  • Old Cars Weekly
  • Old House Journal
  • Period Homes
  • Popular Woodworking
  • Script
  • ShopNotes
  • Sports Collectors Digest
  • Threads
  • Timber Home Living
  • Traditional Building
  • Woodsmith
  • World Coin News
  • Writer's Digest
Active Interest Media logo
X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Project Guides
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Online Learning

  • Courses
  • Project Guides
  • Reader Projects
  • Podcast

More

  • FHB Ambassadors
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • X
  • YouTube
  • instagram
  • facebook
  • pinterest
  • Tiktok

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

Enjoy unlimited access to Fine Homebuilding. Join Now

Already a member? Log in

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in

Privacy Policy Update

We use cookies, pixels, script and other tracking technologies to analyze and improve our service, to improve and personalize content, and for advertising to you. We also share information about your use of our site with third-party social media, advertising and analytics partners. You can view our Privacy Policy here and our Terms of Use here.

Cookies

Analytics

These cookies help us track site metrics to improve our sites and provide a better user experience.

Advertising/Social Media

These cookies are used to serve advertisements aligned with your interests.

Essential

These cookies are required to provide basic functions like page navigation and access to secure areas of the website.

Delete My Data

Delete all cookies and associated data