Today’s wall assembly has to do more than hold a finish. It has to manage heat, air, water, drainage, fire performance, installation speed, and long-term durability. At the same time, owners and design teams still want a finished building that looks strong, permanent, and well built.

That is why more commercial teams are looking for wall systems that bring multiple layers together in one coordinated assembly.

The Panel+ Wall System by Old Mill Systems was built for that need. It combines continuous insulation, air and water protection, integrated drainage, and precision veneer alignment for thin brick, stone, or tile. Instead of forcing architects, contractors, and installers to coordinate separate products from separate manufacturers, Panel+ gives the project team a tested, practical path to a high-performance masonry veneer wall.

What Is a Commercial Wall System?

A commercial wall system is a coordinated exterior wall assembly designed to manage performance, code needs, installation, and finished appearance.

A complete system may include:

• Air and water protection
• Continuous insulation
• Drainage and ventilation
• Attachment components
• Adhesives or fasteners
• Exterior cladding
• Flashing and joint detailing
• Fire and weather performance testing

For many commercial projects, the challenge is not finding each product. The challenge is getting the products to work together.

That is where system design matters.

Panel+ was created as an integrated wall system for commercial and professional projects. It brings together Old Mill Weather Barrier, EPS foam insulation panels, adhesives or fasteners, and a finished veneer surface using thin brick, stone, or tile. The result is a coordinated wall assembly that helps simplify design, installation, and support from sheathing out.

Why Continuous Insulation Matters in Commercial Construction

Continuous insulation helps reduce thermal bridging.

Thermal bridging happens when heat moves through framing, fasteners, or other conductive parts of the wall assembly. Even when cavity insulation performs well, framing can reduce the whole-wall R-value. Continuous insulation adds a more consistent layer across the outside of the wall.

For commercial buildings, that matters because the exterior wall affects:

• Heating and cooling loads
• Occupant comfort
• Energy code compliance
• Condensation control
• Long-term operating costs

The 2024 International Energy Conservation Code is part of the broader code framework used to support energy-efficient building design, and continuous insulation remains a key strategy in modern exterior wall assemblies.

Panel+ uses EPS foam insulation panels with a thermal value listed at R-4.2 per inch in Old Mill source materials, with common panel thicknesses available in 1 inch, 2 inches, 3 inches, 4 inches, and custom options. The system can provide up to R-20 insulation depending on panel configuration.

What Makes Panel+ Different From a Standard Exterior Wall Assembly?

Traditional adhered masonry veneer assemblies can require several separate steps and trades. Teams may need to coordinate the WRB, insulation, drainage, lath or substrate, layout, adhesives, veneer placement, and detailing.

Panel+ simplifies that process.

The system includes:

EPS Foam Panels

Panel+ EPS panels provide the continuous insulation layer and act as a stable backing for thin brick, stone, or tile veneer. The panels include guide channels that help align veneer courses and improve installation consistency.

Old Mill Weather Barrier

Old Mill Weather Barrier is a fluid-applied air and water barrier that protects approved substrates from water damage and air infiltration. It can be applied by roller, brush, trowel, or spray, depending on project needs.

Drainage and Ventilation Channels

Panel+ is designed with drainage and ventilation channels to help move incidental moisture and support drying behind the veneer. This matters because moisture management is one of the biggest long-term performance concerns in exterior wall construction.

Veneer Alignment Tracks

The integrated alignment tracks help installers place thin brick, stone, or tile more consistently. This reduces the need for constant layout corrections and helps crews produce a cleaner finished wall.

Adhesive or Mechanical Attachment Options

Panel+ can use fluid-applied adhesive or mechanical fastening methods. The installation method depends on the project conditions, substrate, and design requirements. Old Mill installation guidance includes both approaches.

Panel+ vs. EIFS: What Is the Difference?

EIFS, or Exterior Insulation and Finish System, typically uses insulation board, a reinforced base coat, and a synthetic finish coat. It is often chosen for a smooth stucco-like exterior.

Panel+ also provides insulation and exterior wall performance, but it is designed around real veneer finishes like thin brick, stone, or tile. It also includes built-in guide channels for veneer alignment and moisture drainage.

Here is the simple comparison:

Panel+ is a better fit when the project calls for the look and durability of masonry veneer with modern wall performance.

Why Panel+ Works for Commercial Projects

Commercial jobs need products that perform on paper and on the wall.

Panel+ supports several high-value project goals:

Faster Installation

Panel+ can reduce labor time and project costs by up to 60%. That matters for general contractors and builders who need reliable schedules, simpler coordination, and fewer trade bottlenecks.

Better Energy Performance

Panel+ can reduce energy use by up to 40% by adding continuous insulation and supporting a tighter exterior wall assembly.

Design Flexibility

Panel+ accepts thin brick, stone, and tile finishes. Architects can use it for flat façades, accents, columns, archways, and architectural relief. Old Mill source materials note that Panel+ supports customizable thicknesses and can help create relief without heavy traditional masonry detailing.

Moisture Protection

The system includes Old Mill Weather Barrier and integrated panel channels that help manage incidental moisture. This gives project teams a practical approach to air, water, and drainage control in one coordinated system.

Fire-Tested Assembly Support

NFPA 285 is a fire test method used to evaluate fire propagation characteristics of exterior non-load-bearing wall assemblies that contain combustible components. NFPA provides guidance to help determine when exterior wall requirements and testing to NFPA 285 apply.

Old Mill source materials state that Panel+ has passed NFPA 285 testing and is designed for commercial wall assemblies where fire performance and code alignment matter.

Where Panel+ Fits Best

Panel+ is a strong fit for commercial and professional projects where teams want real masonry character without the full weight, schedule, and labor demands of traditional masonry.

Common applications include:

• Multifamily buildings
• Hospitality projects
• Medical buildings
• Education facilities
• Office buildings
• Retail centers
• Modular and offsite construction
• Residential developments with commercial-grade wall needs

It also works for retrofit projects where the team wants to improve exterior performance and update the building’s finish at the same time.

A Better Way to Build With Thin Brick, Stone, or Tile

Commercial wall assemblies should not force a tradeoff between performance and appearance.

Panel+ gives architects and builders a practical path to both. It supports continuous insulation, air and water protection, moisture drainage, and real veneer finishes in one coordinated system. It also gives installers built-in alignment support, which can reduce layout errors and help speed up the job.

For owners, that means a finished wall that looks substantial and supports long-term building performance.

For contractors, it means fewer layers to coordinate and a system designed to move efficiently.

For architects, it means more freedom to design with thin brick, stone, or tile while meeting modern performance expectations.

Build Smarter With Old Mill Systems

Old Mill Systems helps commercial teams build faster, cleaner, and with more confidence. Panel+ brings together the core pieces of a high-performance exterior wall assembly: continuous insulation, air and water protection, drainage, tested performance, and real masonry veneer appeal.

For commercial projects that need energy performance, code alignment, and a durable finish, Panel+ gives you a wall system built for the way projects actually get built.

Explore the Panel+ Wall System, review Old Mill Systems specifications, or contact the commercial team to discuss your next project.