This Arches and Keystones Case Study documents the restoration of the historic façade at 4050 Broadway Blvd in Kansas City, Missouri. After a vehicle collision destroyed several decorative corbels, arches, and keystones, Watt Enterprises required an exact architectural replica that would preserve the building's historic character while improving installation efficiency.
Historic Facade Restoration Project
Project Type: Historic Facade Restoration
Location: 4050 Broadway Blvd, Kansas City, Missouri
Client: Watt Enterprises
Industry: Historic Preservation / Commercial Building Restoration
Product System: EPS Core + Polyurea Hard Coat + Sherwin Williams Exterior Paint
Timeline: 35 days (design to installation)
Budget Range: $$
Result: Exact replicas of decorative corbels, arches, and keystones were installed four times faster than traditional masonry while reducing weight by 85%. As a result, the building retained its historic appearance without adding structural risk.
Project Overview
This Arches and Keystones Case Study documents the restoration of a historic commercial building at 4050 Broadway Blvd in Kansas City, Missouri. After a vehicle collision destroyed several decorative corbels and arches, Watt Enterprises needed replacement elements that matched the original architecture in both appearance and dimensions.
However, traditional masonry would have added significant weight, increased installation time, and required heavy lifting equipment. Therefore, Royal Foam developed lightweight architectural replicas that preserved the building's historic character while simplifying fabrication and installation.
As a result, the restored façade achieved full historic preservation approval while reducing structural loads, shortening the project schedule, and minimizing disruption to the property.
Arches and Keystones Case Study Challenges
Context
- Historic commercial building damaged by vehicle impact.
- Decorative corbels and arches completely destroyed.
- Historic appearance had to be preserved.
Constraints
- Exact visual replication required for preservation approval.
- Limited site access in a busy urban location.
- No crane or heavy lifting equipment allowed.
- Existing façade could not support excessive additional weight.
Risks
- Heavy masonry replicas could overload the structure.
- Decorative details required extremely accurate reproduction.
- Extended construction could affect building occupancy.
- Exterior work remained exposed to changing weather conditions.
Engineering Solution
Royal Foam developed a lightweight architectural restoration system that accurately replicated the original corbels, arches, and keystones while meeting the project's structural and historic preservation requirements. Instead of reproducing the damaged elements with traditional masonry, the engineering team selected modern composite materials that preserved the original appearance while significantly reducing weight. As a result, the restored façade maintained its historic character without placing additional stress on the existing structure.
Material System
- EPS Core Density: 2.0 lb/ft³
- Coating: 60 mil polyurea hard coat
- Finish: Sherwin Williams custom-matched exterior paint
Structural Design
- Modular sectional design for corbels and arches
- Adhesive attachment system
- Lightweight components requiring no structural reinforcement
Fabrication
- 3D laser scanning of surviving architectural elements
- Digital 3D modeling for precise replication
- 3D-printed master patterns and silicone molds for corbels
- CNC hot-wire cutting of EPS cores for arches
- Polyurea coating applied in a controlled production environment
Custom Details
- Exact replication of ornamental corbel profiles
- Precise arch geometry and curvature
- Integrated keystones and decorative detailing
- Custom color and texture matched to the existing historic façade
System Architecture
Each component was engineered to replicate the appearance of traditional masonry while providing the advantages of modern lightweight construction. Furthermore, every layer was selected to improve durability, weather resistance, and installation efficiency.
Layer Structure
- EPS structural core for lightweight load distribution
- 30 mil polyurea hard coat for impact and weather resistance
- Textured finish layer for an authentic historic appearance
- Sherwin Williams UV-resistant paint system for long-term color stability
Result
The completed system delivered an exact visual match to the original architectural elements while providing lower structural load, greater durability, and improved long-term performance.
Before and After Restoration
Before
- Decorative corbels and arches were destroyed after a vehicle impact.
- Large sections of the upper façade were missing.
- The building's historic appearance was significantly compromised.
After
- Decorative elements were restored with an exact visual match.
- Historic symmetry and architectural character were fully recovered.
- Lightweight components eliminated additional structural loading.
- The restored façade blended seamlessly with the original masonry.
Installation Process
Step 1 — Design (4 Days)
First, the remaining architectural elements were scanned and converted into detailed 3D models. Afterward, the client and historic preservation authorities approved the final design.
Step 2 — Engineering (3 Days)
Next, engineers completed structural calculations, finalized the attachment method, and verified that every material matched the project's restoration requirements.
Step 3 — Fabrication (20 Days)
Then, master patterns were produced using 3D printing, silicone molds were created for the corbels, EPS cores were CNC-cut for the arches, and every component received a durable polyurea coating followed by a custom exterior finish.
Step 4 — Delivery (3 Days)
After fabrication, the lightweight architectural components were shipped without special transportation equipment, simplifying project logistics.
Step 5 — Installation (5 Days)
Finally, a small installation crew mounted the modular system without cranes or heavy lifting equipment. As a result, the restoration was completed quickly while minimizing disruption to the property.
Project Results
The restoration project demonstrated how modern lightweight architectural systems can simplify historic preservation without compromising authenticity. As a result, the client received an exact replica of the original façade elements while reducing installation time, structural load, and overall project costs.
Key Project Results
- 85% lighter than traditional concrete or masonry replicas
- Installation completed 4× faster than conventional restoration methods
- Total project completed in 35 days
- Installation costs reduced by approximately 45%
- No structural reinforcement or heavy equipment required
- Maintenance-free exterior surface with a 10+ year durability guarantee
- 100% approval from historic preservation authorities
Cost and Performance Comparison
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Engineering Compliance
Royal Foam designed the restoration system to satisfy both engineering requirements and historic preservation standards. Furthermore, every material and installation method was selected to provide long-term durability while protecting the original structure.
The completed restoration included:
- Compliance with Kansas City historic preservation guidelines
- Wind load engineering for Missouri climate conditions
- Impact-resistant polyurea protective coating
- Closed-cell EPS with non-corrosive anchoring system
- Complete material specifications and structural load calculations
Conclusion
This Arches and Keystones Case Study demonstrates how historic architectural elements can be restored with modern engineering solutions that preserve original design while improving construction efficiency. Ultimately, the project delivered an exact visual match, reduced installation time, minimized structural loads, and extended the long-term performance of the restored façade.