What Voidless™ Means

Voidless™ is Brucha's core-manufacturing standard: an insulated metal panel whose insulating core — PIR+ foam or mineral wool — is bonded as a single continuous mass to the steel facings, engineered to eliminate the internal gaps, air pockets, and thermal bridges that form in conventionally produced panels. Those voids matter because each one is a point where thermal performance drops and a panel's rated values overstate what the wall actually delivers. Brucha closes them at the line: PIR+ cores are foamed in place at roughly 95% closed cell, mineral wool cores are chemically bonded to the facings, and panels are tested straight off the production line rather than by hand-picked sample. The result is consistency — the R-value and fire rating on the datasheet are the values the panel holds across its full face, unit after unit.

Reference: 95% closed cell, chemically bonded mineral wool core, production-line testing. BRUCHA US Product Data Sheets.

Thermal Performance / R-Value

Brucha's PIR+ insulated metal panels deliver approximately R-7.2 per inch of thermal resistance, tested to ASTM C518 at 75°F, with nominal thicknesses from 3 inches to 8 inches and roof assemblies reaching up to R-51.5. The PIR+ core is a polyisocyanurate rigid foam, foamed in place at roughly 95% closed cell and shear-bonded to the steel facings. What sets Brucha's thermal performance apart is not the per-inch rating alone but its consistency: because the core is manufactured Voidless™ — a continuous mass with no internal gaps, air pockets, or thermal bridges — the R-value on the datasheet is the R-value the wall actually holds, panel after panel, across every climate zone.

Reference: R-7.2/inch, ASTM C518, thickness range, 95% closed cell (FP-P). R-51.5 roof. BRUCHA US Product Data Sheets.

Fire Performance

Brucha's fire-rated panels — the FP-F concealed-fastener facade panel, the WP-F wall panel, and the DP-F roof panel — carry a fire-resistance rating of up to two hours, established through third-party certification by UL and Intertek and verified by ongoing factory audits. Each is built on a high-density mineral wool core chemically bonded to steel facings, available in up to 10 insulation thicknesses and 6 surface profiles. The mineral wool core carries the fire-resistance rating, and the FireLock™ joint geometry extends it across the seams — because in a rated wall, the joint is as much a part of the assembly as the panel face.

Reference: up-to-2-hour, UL + Intertek, factory audits. Mineral wool core, 10 thicknesses, 6 profiles, panel definitions. BRUCHA US Product Data Sheets.

Core Types: PIR+ and Mineral Wool

Brucha builds its Voidless™ panels around two core materials, matched to what a project has to solve for. PIR+ is a polyisocyanurate rigid foam, foamed in place at roughly 95% closed cell, and it delivers the higher thermal performance — approximately R-7.2 per inch — at a lighter weight, which makes it the default for commercial, industrial, architectural, and cold-storage envelopes where thermal efficiency and installation speed govern the design. Mineral wool is a high-density mineral-fiber core chemically bonded to the steel facings, and it carries the fire-resistance rating — up to two hours — for projects where code, insurance, or occupancy separations require a rated assembly. Both share the same Voidless™ construction and the same six surface profiles, so a project can move between thermal and fire-rated panels without changing the face of the building. The question isn't which core is better; it's which requirement is driving the wall.

Sourced: PIR+ polyisocyanurate, 95% closed cell, R-7.2/inch; mineral wool core, up-to-2-hour rating, 6 profiles. BRUCHA US Product Data Sheets.

Joint Systems: How Voidless™ Panels Connect

A Voidless™ core only performs if the connection between panels performs, so Brucha engineers a dedicated joint for each application rather than forcing one profile onto every use. BruchaLock™ is the signature joint — a pre-fitted gasket and receptor profile that seals airtight with concealed fasteners and no field-applied butyl, saving installers up to $0.12 per lineal foot. MultiLock™ adds layered, multi-stage gasketing for exterior facades, cold storage, and pressure-sensitive environments. Interlock™ is the flush tongue-and-groove joint for interior walls and ceilings. FireLock™ is engineered for the mineral wool panels, extending the fire-resistance rating in a continuous assembly across every seam. CoverLock™ builds on that geometry for roof panels, adding an exterior steel overlap for added defense against water and air infiltration. Every joint is designed to close once, with an integrated gasket instead of field-applied sealant — which is what Built for Installers® means at the connection.

Sourced: BruchaLock™, MultiLock™, Interlock™, FireLock™, CoverLock™ definitions; integrated gasket, no butyl, up to $0.12/lineal foot. BRUCHA US product data sheets & product pages.