Commercial projects face a tight set of demands. The envelope needs to stop fire spread, manage moisture, deliver thermal performance, and still look like real masonry from the street. Meeting all four with separate products and separate trades adds cost, schedule risk, and coordination headaches.
NFPA 285 compliant continuous insulation wall systems solve that problem by combining fire-tested assemblies, energy performance, and moisture control in a single coordinated build-up. Old Mill Building Products manufactures one such system, Panel+, that pairs continuous insulation with field-installed thin brick veneer for commercial facades.
This article explains what NFPA 285 requires, how continuous insulation supports thin brick facades, and what architects and builders should evaluate when specifying these assemblies.
NFPA 285 is a fire test method published by the National Fire Protection Association. It evaluates how exterior wall assemblies containing combustible components perform when exposed to fire. Any wall assembly that includes foam insulation, weather barriers, or other combustible materials on buildings above a certain height must pass this test under the International Building Code (IBC).
For thin brick facades on commercial projects, NFPA 285 compliance is not optional. Expanded polystyrene (EPS), extruded polystyrene (XPS), and polyisocyanurate insulation boards are all combustible. When you add continuous insulation behind thin brick veneer, the entire assembly needs to be tested and documented as NFPA 285 compliant.
Compliance means the assembly was tested as a complete system, not component by component. The insulation, adhesive, weather barrier, and veneer must be tested together. This is a critical distinction for specifiers, because substituting one component can void the tested assembly.
Thermal bridging occurs wherever framing members, fasteners, or structural elements interrupt the insulation layer. In steel-framed commercial buildings, thermal bridges can reduce effective wall R-value by 30 percent or more. According to a report from the Smart Energy Design Assistance Center, continuous insulation is one of the most effective strategies for addressing this loss.
Continuous insulation (CI) wraps the exterior of the structure without breaks at studs, sills, or headers. This uninterrupted layer maintains consistent thermal performance across the entire wall area. The result is a predictable, code-compliant R-value you can count on from wall details through whole-building energy modeling.
For thin brick facades, CI also shifts the dew point outward. That keeps condensation risk away from sheathing and structural components, which reduces long-term moisture damage and extends the service life of the assembly.
A compliant assembly is a coordinated system, not a collection of individual products. Each component from the sheathing outward plays a defined role in fire performance, thermal control, and moisture management.
The typical assembly includes a structural substrate (steel or wood framing with exterior sheathing), an air and water barrier, continuous insulation panels, an adhesive or mechanical attachment system, and field-installed thin brick veneer. Every layer must be part of the tested assembly to maintain NFPA 285 compliance.
Panel+ from Old Mill Systems is one example of a single-source wall system engineered for this purpose. Panel+ uses EPS foam panels with built-in drainage and ventilation channels, paired with Old Mill Air & Water Barrier, Old Mill Adhesive, and real thin brick veneer. The full assembly supports NFPA 285 compliance and delivers R-4.2 per inch at 75°F.
Moisture behind a veneer facade is not a question of if, but when. Wind-driven rain, construction moisture, and vapor diffusion all introduce water into the wall assembly. The system needs a reliable path to drain that water and dry the cavity.
In NFPA 285 compliant CI systems, the air and water barrier is the primary line of defense. It stops bulk water and air infiltration at the sheathing plane. Behind the insulation, drainage channels routed into the foam panels give water a clear exit path. Ventilation channels allow air movement that accelerates drying.
Old Mill Building Products' Panel+ integrates cross-drainage channels directly into the EPS panels. This means you don't need a separate drainage mat or rainscreen cavity. The panel itself manages water evacuation and drying, which simplifies the install and reduces the number of components crews need to coordinate.
Specifying insulation from one manufacturer, adhesive from another, and a weather barrier from a third creates gaps. If a moisture issue or fire performance question arises, responsibility is fragmented across multiple suppliers. No single entity owns the assembly performance.
A single-source wall system changes that dynamic. When one manufacturer provides the insulation, adhesive, weather barrier, fasteners, and veneer alignment, the entire assembly is tested and warranted as a unit. Old Mill Building Products backs the Panel+ Wall System with a 15-year system warranty that covers the coordinated components from sheathing out.
For contractors, this means fewer suppliers to manage, one technical support team to call, and a documented code path that doesn't require custom engineering for each project. For architects, it simplifies the specification process and reduces the risk of untested component substitutions.
Traditional thin brick on commercial walls often requires a multi-step process: install a separate weather barrier, add a drainage plane, attach insulation, apply lath, apply scratch coat, then set the brick. Each step involves a different material, a different trade, and added schedule time.
Panel+ consolidates several of those steps. The EPS panels provide insulation, drainage, ventilation, and veneer alignment in one component. Crews attach the panels to the substrate, then install thin brick directly onto the panel face using Old Mill Adhesive. No lath. No scratch coat. No mason required for the wall system install.
Panel+ reduces labor time by up to 60 percent compared to traditional multi-step veneer methods. That shows up in shorter project timelines, reduced labor coordination, and fewer trades on the wall at the same time. On commercial projects where the facade scope covers thousands of square feet, that efficiency compounds fast.
Energy codes for commercial buildings continue to tighten. The 2024 IECC and ASHRAE 90.1 both require continuous insulation in most climate zones for steel-framed walls. Meeting those requirements with a veneer facade means the CI layer needs to deliver measurable thermal performance.
Panel+ delivers R-4.2 per inch at 75°F, with panel thicknesses available from 1 inch to 4 inches and custom options. A 4-inch Panel+ assembly achieves R-values up to 20, with energy cost reductions up to 40 percent compared to assemblies with thermal bridging through the insulation layer.
Because the insulation is continuous and unbroken by framing, the installed R-value closely matches the rated R-value. That's a meaningful difference from cavity insulation, where steel studs can cut effective R-value significantly.
Specifying an NFPA 285 compliant CI wall system for thin brick requires checking three things: the assembly has been fire-tested as a complete unit, the system manages moisture with documented drainage and drying mechanisms, and the insulation delivers the R-value your energy model needs.
Old Mill Building Products' Panel+ Wall System addresses all three in a single coordinated package. It combines continuous insulation, NFPA 285 compliant assemblies, built-in drainage, and field-installed real thin brick in one system from one manufacturer, backed by a 15-year warranty.
Samples, technical data sheets, and a responsive technical team are available to help you evaluate Panel+ for your next commercial thin brick project.
NFPA 285 tests fire propagation characteristics of exterior wall assemblies that include combustible components. The test evaluates how fire spreads within the wall cavity and across the exterior surface when exposed to a controlled flame source. Passing this test is required by the IBC for commercial buildings.
No. NFPA 285 compliance applies to the complete, tested assembly. Replacing the insulation, adhesive, or weather barrier with an alternative product voids the tested configuration. Always verify with the system manufacturer before making substitutions.
Old Mill Building Products tests the Panel+ Wall System as a complete assembly, including the EPS foam panels, Old Mill Adhesive, Old Mill Air & Water Barrier, and thin brick veneer. This coordinated testing confirms that the full system meets NFPA 285 fire propagation requirements.
Panel+ provides R-4.2 per inch at 75°F. With panel thicknesses up to 4 inches, you can achieve R-values up to 20. Old Mill Building Products also offers custom thicknesses to match project-specific energy code requirements.
CI reduces reliance on cavity insulation by wrapping the structure in an unbroken thermal layer. In many commercial wall assemblies, CI alone meets or exceeds code-required R-values. Your energy consultant and the project specifications will determine whether additional cavity insulation is needed.