You Don’t Need a Perfect Ceiling to Get a Perfect Finish
If you've ever looked up and noticed your ceiling doesn’t quite line up corner to corner, you’re not alone. In fact, most ceilings aren’t perfectly square—especially in older homes, but even newer constructions can have slight irregularities. That’s totally normal. The good news? A not-so-square ceiling doesn’t have to derail your tin ceiling project.
At American Tin Ceilings, we hear from customers all the time who feel overwhelmed or unsure of how to move forward when their ceiling isn’t a perfect rectangle. The truth is, a few simple layout tricks (and the right finishing touches) can make all the difference.
Here’s how to confidently plan your ceiling tile layout—even if your ceiling is a little off.

1. How to Check if Your Ceiling Is Square
Before you begin, it helps to understand what you're working with.
Quick Tip: Measure diagonally from corner to corner in both directions. If the measurements match, your ceiling is square. If they’re off by a bit, that just means you’ll want to be strategic with your layout—no big deal!
2. Center First, Then Work Outward
One of the best ways to handle an uneven space is to center your design. That way, any imperfections are pushed to the edges, where they can be disguised with trim or molding.
- Snap chalk lines from the midpoints of opposite walls to find your room’s true center.
- Begin laying out your tile pattern from this center point and work outward.
- Don’t rely on wall measurements alone—walls may not be straight!
In L-shaped or uniquely shaped rooms, mentally divide the space into simple rectangles. Plan each one separately, then connect them visually with your tile layout.
3. Use a Tile Calculator (and Don’t Forget to Add Extra!)
To determine how many tiles you’ll need, use an online tool like our room planner. It's an easy way to input your room dimensions and get square footage and tile quantity easily.
Pro Tip: Add 10–15% extra to your order to cover cuts, waste, and any small errors. It’s always better to have a few extras on hand than to come up short.
4. Embrace Imperfections at the Edges
Even the most meticulous layout can leave small gaps at the edges of a room—and that’s totally normal. The goal isn’t perfection against the wall, but a polished overall appearance.
That’s where finishing touches come in.
Crown Molding
- Great for traditional or ornate spaces
- Covers uneven gaps where the ceiling meets the wall
- Adds visual height and elegance
Flat Trim
- Ideal for clean, modern designs
- Provides a sleek border and hides small imperfections
Filler Tiles
- Patternless strips used around the perimeter
- Easy to trim to size
- Allow you to keep full, centered tiles in the main visual field
Caulk or Paint
- Caulk can help seal tiny gaps between tiles and trim for a smoother, more professional look
- Matching paint around the edges can visually blend slight imperfections, especially in uneven areas
These finishing pieces not only hide inconsistencies but also elevate the entire look of your ceiling.
Shop Filler Panels
Shop Moldings

5. Reassurance: You’ve Got This
Planning a ceiling project in a not-so-square room might feel intimidating, but it doesn’t have to be. A centered layout, the right tools, and a few strategic finishes can help you create a professional, polished result. You don’t need a perfect ceiling to get a perfect finish.
Have questions? Our team is always here to help with personalized recommendations and layout tips.