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4400
Fire-retardant framing for the projects that demand more.
The red RezWood™ system combines mold, decay, and subterranean-termite protection with evaluated fire-retardant treatment for qualifying dimensional-lumber applications within TER 1510-01. Rated assemblies require their own applicable documentation.
4400
Explore 4400
The details that matter.
Applications, protection, certifications and warranty options for 4400.
Purpose + applications
The full fire-retardant system.
4400 is the highest fire-performance tier in the RezWood™ family. It is built for commercial, multifamily, and code-driven construction where the material must do more than carry a Class A label—it must meet the requirements applied to fire-retardant-treated wood.
More than a color or short test
4400 is evaluated for use when fire-retardant-treated lumber is required. Covered lumber products achieve flame-spread index values of 25 or less and smoke-developed index values of 450 or less under the extended testing identified in the current report.
FRTW is a material classification
The current report evaluates qualifying lumber for the documented FRTW role. Any one- or two-hour wall claim requires a separate current assembly report and the exact approved assembly; do not infer an hourly rating from red lumber alone.
Specify the evaluated scope
Species, grade, size, treatment, use condition, installation, fasteners, field treatment, and approved construction documents must match the current report. Separate assembly documentation is required whenever an hourly wall rating is claimed.
Common applications
Qualifying code-required FRT framingMultifamily construction where the current report appliesCommercial framing within the evaluated scopeStuds, plates, joists, and raftersProjects with approved FRTW specificationsExact substrates and uses addressed by TER 1510-01
Product-specific protection
Protection built into 4400.
The protection below applies to the treated lumber—not every material in the building—and only within the selected product's documented scope.
Mold-growth inhibition
Helps inhibit mold growth on the treated lumber. Moisture management, drying, and jobsite housekeeping still matter. The public technical evaluation documents mold-growth-inhibition testing using ASTM D3273 and ASTM D5590 methods.
Explore this protection ↗Fungal-decay resistance
Resists decay fungi within the documented exposure conditions. It does not replace flashing, drainage, ventilation, or maintenance. The public technical evaluation documents fungal-decay resistance for the approved lumber, application, and above-ground exposure scope.
Explore this protection ↗Subterranean-termite resistance, including Formosan termites
Resists subterranean termites, including Formosan termites, within the current product scope. Untreated wood and cellulose remain outside the protection package. The public technical evaluation documents subterranean-termite resistance for eligible treated lumber within the approved application and exposure scope.
Explore this protection ↗Extended fire-retardant performance
FRT lumber with extended ASTM E84 and ASTM E2768 performance within the current evaluated scope The documented fire-retardant system uses extended surface-burning evaluation; any rated wall claim belongs to the complete listed assembly.
Explore this protection ↗Important context
The correct comparison for RezWood 4400 is an approved fire-retardant-treated lumber system—not ordinary pressure-treated lumber. Fire-retardant status and wall ratings belong to the documented product and assembly, not to lumber color alone.
Public technical record
Testing behind the treatment.
Review the standards, certifications and application limits for the selected lumber and project.
GREENGUARD Certified for low emissions
The supplied certification covers the finished 4400 system tested with wood under UL 2818 for low chemical emissions.
Extended fire-retardant performance
The documented lumber system is evaluated using ASTM E2768 criteria, including the extended surface-burning performance required for fire-retardant-treated wood.
FRTW is a material classification
The current report evaluates qualifying lumber for the documented FRTW role. Any one- or two-hour wall claim requires a separate current assembly report and the exact approved assembly; do not infer an hourly rating from red lumber alone.
Third-party evaluated code use
Independent technical documentation supports approved fire-retardant applications, preservative performance, and the exact building-code conditions for use.
Important context
Technical fit: UC1, UC2, and protected UC3A conditions. Texas Wood Tech currently offers RezWood™ 4400 in common dimensional lumber sizes. Large timbers, engineered beams, treated structural panels, and truss packages are not part of the current RezWood™ offering unless separately released in writing.
Eligible project coverage
Coverage matched to the treatment.
Eligible RezWood™ 4400 projects may include the coverage below, subject to the complete current written terms.
Before framing · 4 months · Covered, elevated jobsite storage
Eligible projects may include coverage while the lumber is stored before framing begins, provided the package is properly covered, elevated, and handled under the written requirements.
During construction · Up to 6 months · Vertical framing exposure
Eligible projects may include coverage while installed vertical framing remains exposed during construction. Drainage, drying, housekeeping, and the documented exposure conditions still matter.
After construction · 5 years · Mold
Eligible projects may include limited protection against mold growth on the treated lumber. Coverage does not replace moisture control, ventilation, leak repair, or normal building maintenance.
Long-term protection · 10 years · Subterranean termite damage
Eligible projects may include limited protection for damage from the termite species named in the written warranty, including subterranean and Formosan termites. Untreated wood, cellulose, and conditions outside the documented application remain outside the coverage.
Long-term protection · 10 years · Fungal decay
Eligible projects may include limited protection against fungal decay of the treated lumber within the approved exposure and application. Good flashing, drainage, ventilation, and maintenance remain required.
RezWood™ 4400 only · Up to 20 years · Specified Class A surface-burning performance
Eligible RezWood™ 4400 projects may include coverage for the specified Class A surface-burning performance. This is performance coverage—not fire-damage coverage.
Important context
See complete warranty options ↗Coverage depends on the selected product, documented application, registration, treatment record, installation, maintenance, exclusions, and complete current written warranty. The additional 4400 coverage concerns specified Class A surface-burning performance—not loss or damage from fire.
01What it does
The full fire-retardant system.
4400 is the highest fire-performance tier in the RezWood™ family. It is built for commercial, multifamily, and code-driven construction where the material must do more than carry a Class A label—it must meet the requirements applied to fire-retardant-treated wood.
More than a color or short test
4400 is evaluated for use when fire-retardant-treated lumber is required. Covered lumber products achieve flame-spread index values of 25 or less and smoke-developed index values of 450 or less under the extended testing identified in the current report.
FRTW is a material classification
The current report evaluates qualifying lumber for the documented FRTW role. Any one- or two-hour wall claim requires a separate current assembly report and the exact approved assembly; do not infer an hourly rating from red lumber alone.
Specify the evaluated scope
Species, grade, size, treatment, use condition, installation, fasteners, field treatment, and approved construction documents must match the current report. Separate assembly documentation is required whenever an hourly wall rating is claimed.
Qualifying code-required FRT framingMultifamily construction where the current report appliesCommercial framing within the evaluated scopeStuds, plates, joists, and raftersProjects with approved FRTW specificationsExact substrates and uses addressed by TER 1510-01
02What we protect against
Protection built into 4400.
The protection below applies to the treated lumber—not every material in the building—and only within the selected product's documented scope.
Mold-growth inhibition
Helps inhibit mold growth on the treated lumber. Moisture management, drying, and jobsite housekeeping still matter. The public technical evaluation documents mold-growth-inhibition testing using ASTM D3273 and ASTM D5590 methods.
Explore this protection ↗Fungal-decay resistance
Resists decay fungi within the documented exposure conditions. It does not replace flashing, drainage, ventilation, or maintenance. The public technical evaluation documents fungal-decay resistance for the approved lumber, application, and above-ground exposure scope.
Explore this protection ↗Subterranean-termite resistance, including Formosan termites
Resists subterranean termites, including Formosan termites, within the current product scope. Untreated wood and cellulose remain outside the protection package. The public technical evaluation documents subterranean-termite resistance for eligible treated lumber within the approved application and exposure scope.
Explore this protection ↗Extended fire-retardant performance
FRT lumber with extended ASTM E84 and ASTM E2768 performance within the current evaluated scope The documented fire-retardant system uses extended surface-burning evaluation; any rated wall claim belongs to the complete listed assembly.
Explore this protection ↗Important context
The correct comparison for RezWood 4400 is an approved fire-retardant-treated lumber system—not ordinary pressure-treated lumber. Fire-retardant status and wall ratings belong to the documented product and assembly, not to lumber color alone.
03Certifications + fit
Testing behind the treatment.
Review the standards, certifications and application limits for the selected lumber and project.
GREENGUARD Certified for low emissions
The supplied certification covers the finished 4400 system tested with wood under UL 2818 for low chemical emissions.
Extended fire-retardant performance
The documented lumber system is evaluated using ASTM E2768 criteria, including the extended surface-burning performance required for fire-retardant-treated wood.
FRTW is a material classification
The current report evaluates qualifying lumber for the documented FRTW role. Any one- or two-hour wall claim requires a separate current assembly report and the exact approved assembly; do not infer an hourly rating from red lumber alone.
Third-party evaluated code use
Independent technical documentation supports approved fire-retardant applications, preservative performance, and the exact building-code conditions for use.
Important context
Technical fit: UC1, UC2, and protected UC3A conditions. Texas Wood Tech currently offers RezWood™ 4400 in common dimensional lumber sizes. Large timbers, engineered beams, treated structural panels, and truss packages are not part of the current RezWood™ offering unless separately released in writing.
04Warranties
Coverage matched to the treatment.
Eligible RezWood™ 4400 projects may include the coverage below, subject to the complete current written terms.
Before framing · 4 months · Covered, elevated jobsite storage
Eligible projects may include coverage while the lumber is stored before framing begins, provided the package is properly covered, elevated, and handled under the written requirements.
During construction · Up to 6 months · Vertical framing exposure
Eligible projects may include coverage while installed vertical framing remains exposed during construction. Drainage, drying, housekeeping, and the documented exposure conditions still matter.
After construction · 5 years · Mold
Eligible projects may include limited protection against mold growth on the treated lumber. Coverage does not replace moisture control, ventilation, leak repair, or normal building maintenance.
Long-term protection · 10 years · Subterranean termite damage
Eligible projects may include limited protection for damage from the termite species named in the written warranty, including subterranean and Formosan termites. Untreated wood, cellulose, and conditions outside the documented application remain outside the coverage.
Long-term protection · 10 years · Fungal decay
Eligible projects may include limited protection against fungal decay of the treated lumber within the approved exposure and application. Good flashing, drainage, ventilation, and maintenance remain required.
RezWood™ 4400 only · Up to 20 years · Specified Class A surface-burning performance
Eligible RezWood™ 4400 projects may include coverage for the specified Class A surface-burning performance. This is performance coverage—not fire-damage coverage.
Important context
See complete warranty options ↗Coverage depends on the selected product, documented application, registration, treatment record, installation, maintenance, exclusions, and complete current written warranty. The additional 4400 coverage concerns specified Class A surface-burning performance—not loss or damage from fire.
Technical clarity
Know exactly what
you are specifying.
Current RezWood™ availability
Texas Wood Tech currently offers RezWood™ 4400 in common dimensional lumber sizes. Large timbers, engineered beams, treated structural panels, and truss packages are not part of the current RezWood™ offering unless separately released in writing.
Water-based, mineral-centered protection
Choose fasteners for the treatment, exposure, building code and connector manufacturer’s guidance. RezWood™ 4400 has supplied certification for a system tested with wood under UL 2818 for low chemical emissions.
Cutting any lumber creates wood dust. Use dust control, eye protection and job-specific PPE. Never burn treated wood; confirm local reuse and disposal requirements.
Third-party evaluationProject-specific technical support
TechWood 4400 · Report 1510-01
Revision: June 24, 2026. Reference checked September 12, 2026.
Qualifying fire-retardant-treated wood applications; an hourly wall rating requires separate complete-assembly documentation.
Manufacturer reports do not by themselves confirm a REZWOOD order, treatment facility, private-label authorization or warranty. Ask us to confirm the applicable documents before purchase.
Manufacturer’s public document index ↗Call REZWOOD for project documents: 903-573-0333Email the manufacturer for technical support ↗