
Take advantage of volume discounts on our Aluminum Trim Products:
For large orders, contact Tread-Ware for additional details and to place your bulk order.
At Tread-Ware, we understand that every project has unique requirements. Our Aluminum Diamond Plate Trims are available in custom sizes and colors, so you can choose a piece of trim that complements your specific aesthetic and functional needs. Contact us for more information.
8" Total Corner Span
An 8 inch total length delivers comprehensive perimeter coverage, easily masking minor out-of-square wall variances.
Tailored Height Profiles
Available in 3" or 4" tall options to match your primary linear ceiling trims and molding tracks seamlessly.
Style-Specific Color Choices
Smooth options include Black, Gray, Red, Blue, and Yellow. Diamond Plate options add a striking Polished face.
Industrial Texture Selections
Choose a bold diamond plate style pattern or a clean smooth plate style face to balance your space's architectural aesthetic.
Durable 3003 Aluminum
Crafted from heavy-duty 3003 aluminum alloy sheet metal to provide excellent long-term impact and corrosion resistance.
Pre Cut Overlapping Edges
Features factory pre cut edge configurations that slide together perfectly, ensuring a tight fit up with no corner blocks needed.
Proudly American Made
Manufactured domestically inside top-tier facilities, guaranteeing highly accurate straight lines and true internal 90-degree angles.
Comprehensive Utility Scale
The ultimate inside corner crown molding solution for contractors, commercial facility managers, and home workshop renovations.
Make installation easy with these fast holding adhesives. These construction grade adhesives, wor...
Secure your Tread-Ware with these stainless steel pan head screws. An easy way to secure your par...
Secure your Tread-Ware with these stainless steel screws. An easy way to secure your parts and ke...
See how our aluminum inside corner molding simplifies installations by completely eliminating miter cutting. This short video highlights our 3" and 4" size options, demonstrates how the innovative two piece design slides into position, and offers quick tips to achieve clean overlapping joints along your wall and ceiling corners.

Do I need to execute complex miter cuts to install these crown molding inside corners?
No. You can officially put the saws away. Our specialized crown molding inside corners come precision-engineered with factory pre cut edges designed to fit directly into any standard 90-degree internal corner. This eliminates the need for frustrating compound miter calculations and dangerous saw cuts, making it the ultimate setup for a fast, stress-free diy crown layout.
How does this two piece design work compared to traditional crown molding corner blocks?
Traditional crown molding inside corner blocks are solid, blocky chunks that interrupt the continuous lines of your ceiling corner molding. Our product utilizes an advanced two piece design consisting of an uncut profile segment and a notched profile segment. This allows the pieces to slide into position smoothly over one another, forming elegant overlapping joints that preserve a low-profile, clean industrial look.
What is the proper step-by-step method to install these ceiling corner trim pieces?
To install these ceiling corner trim segments, first perform a dry mockup fit up in your desired corner. Take the flat, uncut section of the corner piece and press it tightly into the 90-degree corner intersection where your wall meets the ceiling, then fasten it using construction adhesive or screws. Next, take the second piece—the one with the factory cut notch—and slide it into position directly over the first piece so it nests cleanly against both the wall and ceiling, then secure it in place to complete the overlapping joint.
Can this aluminum inside corner molding handle moisture-heavy environments?
Absolutely. Traditional wood or MDF crown molding corner pieces easily swell, warp, rot, and grow mold when exposed to water vapor or temperature fluctuations. Because our crown molding inside corner blocks alternative is fabricated entirely from premium heavy-duty 3003 aluminum alloy, it is 100% rust-proof, non-porous, and corrosion resistant. This makes it perfect for demanding commercial kitchens, public wash bays, residential bathrooms, and active auto shops.
What width sizes and architectural finishes are available for these corner sets?
To ensure comprehensive compatibility with your primary ceiling trims, we offer these crown mold corner blocks in two distinct vertical heights: 3" and 4". Additionally, you can choose between our diamond plate style or smooth plate style. For smooth options, finishes include Black, Gray, Red, Blue, and Yellow. Our diamond plate options include Polished aluminum along with powder-coated Black, Gray, Red, Blue, and Yellow.

Utilizes two mating segments that slide together to form a clean overlapping joint instead of a single bulky block.
An ample 8 inch total length provides significant footprint coverage along both walls to guarantee seamless corner transitions.
Available in 3" or 4" heights to match your existing ceiling profile setups perfectly.
$20.55