Booked my CTI exam for 8 weeks out. I've got 9 years of tile work including showers, large-format, and exterior installations. The hands-on portion doesn't worry me. The written exam is what I'm focused on because it covers standards and specifications I know in practice but not always by the book.
The ANSI/TCNA standards are the core of it — A108, A118, A136, the Handbook. I'm working through those systematically but there's a lot of material and not all of it is equally weighted on the exam.
Substrate preparation questions seem to come up a lot based on what I've read from others. Deflection limits, flatness tolerances, crack isolation — that's stuff I deal with daily but the specific numbers and references are what I need to nail down.
Any suggestions on which ANSI standards to prioritize? I don't have unlimited time and I want to study smart.
Deflection limits (L/360 for ceramic, L/720 for large-format) are guaranteed to appear. Know the thresholds and what you do when a substrate doesn't meet them. That's a practical question they ask in written form.
The NTCA training modules pair well with the standards reading. They explain the why behind the specifications in a way that makes memorization easier. Free to access if you're a member.
A108 is the foundation — know it thoroughly. A118 covers mortar and grout specs, which shows up in material selection questions. The Handbook is more of a reference but the sections on substrate prep and waterproofing are worth reading carefully.
9 years of experience means you already know the right answer for most practical questions — you just need to learn how the standards phrase it. The gap between doing it right and being able to cite the standard is the whole prep challenge.
Just passed mine last month so this is fresh. The thing that clicked for me was actually sitting down with the TCNA Handbook and reading the method specs instead of just knowing what to do on the job. I've been setting tile for 11 years and I still found stuff in there I'd been doing right for the wrong reasons. The written portion loves to test you on specific requirements like bond coat coverage percentages, movement joint placement rules, and substrate prep tolerances. Know those numbers cold.
The ANSI standards tripped me up more than I expected. Didn't think I'd need to know the difference between A108.1A and A108.1B by name but it came up. If I had to pick one thing that made the difference it's this: don't just study what you'd do, study what the spec says you have to do. There's overlap but it's not the same thing. Eight weeks is plenty of time if you're consistent about it.
I'm in a similar boat — 11 years in the field and the hands-on stuff felt like second nature, but the written portion caught me off guard at first. I basically carved out 30 minutes every morning before my crew showed up and did a pass through the TCNA Handbook on my phone. What actually helped me nail the standards side was grinding through practice questions focused specifically on compliance stuff. I found cti/questions/industry standards code compliance and it was honestly the closest thing to what showed up on the actual test. Didn't feel like busywork.
Eight weeks is plenty if you're consistent. I wasn't, and I still passed, so you're probably fine. The written isn't trying to trick you — it's mostly testing whether you know the why behind what you already do every day. Once I started thinking about it that way it clicked a lot faster.
Quick update from my end — just finished a practice run last night and pulled a 78. Wasn't where I wanted to be but honestly it's the ANSI and TCNA standards questions that are killing me, not the material science stuff.
I'm sitting mine in about three weeks. If you haven't drilled the tolerances and substrate requirements yet, I'd start there. That's where I've been losing the most points and it's not stuff you just pick up from years on the job.
Nine years in and the written still trips you up — I get it. What helped me most wasn't grinding through flashcards but going back through wrong answers and actually understanding why they were wrong. Like if you pick the wrong mortar for a large-format tile, it's not just "wrong answer," it's because the deflection limits in the substrate matter, and the spec exists for a reason. I'd work through something like cti/questions/industry standards code compliance 3 and treat every missed question as a mini research session into the ANSI standard behind it.
With 8 weeks you've got enough time to do that properly. Don't just chase the right answers — chase the logic. The written isn't trying to trick you, it's checking whether you know the why behind what you've been doing by feel for years.
I'll be honest, I almost bailed around week four. The ANSI A108 stuff felt like reading a legal document and I wasn't retaining any of it. What finally clicked for me was stopping the flashcard grind and just walking through a real installation in my head, step by step, then matching what I was doing to what the standard actually says. Suddenly the language made sense because I had the muscle memory to hang it on.
The written isn't trying to trick you, it's just checking that you know why you do what you do, not just that you do it. Lippage limits, cure times, substrate prep requirements -- you probably already know all of it, you just don't know the spec numbers. Give yourself time with the TCNA handbook specifically, don't just skim it. I passed with room to spare and I'm genuinely not a test person. You've got this.