™← All treatments3-in-1 protection + E84
3300
A practical step up when surface-burning performance matters.
Blue-identifiable dimensional framing that combines mold, decay, and subterranean-termite protection with ASTM E84-tested surface-burning performance for projects that do not require code-defined FRT lumber.
3300
Explore 3300
Start with what it does.
Then verify the details.
Select the protection, certifications, technical fit, and warranty information for this treatment. Public-facing standards are included; controlled report identifiers and proprietary formulation details are not.
Purpose + applications
Added fire performance—without confusing it with FRTW.
3300 occupies a very specific place in the RezWood™ family: it adds tested surface-burning performance to preservative-treated lumber when a project wants a stronger fire story, but the applicable code does not require fire-retardant-treated wood.
Read the rating by substrate
In the current third-party evaluation, treated dimensional SPF, Douglas fir, and Southern pine achieve Class A surface-burning classifications. Several evaluated engineered substrates are Class B, so the classification must follow the exact substrate specified. Request the Report through TechWood’s controlled technical-document process.
Use 3300 for the right reason
3300 is intended for conditions where FRT lumber is not required by code but Class A or Class B ASTM E84 surface-burning performance is desired. Where FRTW is required, specify 4400 instead.
Protect it from direct wetting
3300 is suitable for above-ground applications not exposed to liquid water. Protected exterior applications require the coating, flashing, and finish details described in the current report.
Common applications
Whole-home dimensional framing packagesInterior wall framingJoists and raftersStuds, plates, and sill platesCommercial and multifamily framingProjects requesting added E84 surface-burning performance
Product-specific protection
Protection built into 3300.
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.
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.
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.
ASTM E84 surface-burning performance
ASTM E84 classification is substrate-specific; dimensional SPF, DF, and SYP achieve Class A values in the current report The documented surface-burning classification follows the exact treated substrate and is not a substitute for fire-retardant-treated wood where FRTW is required.
Important context
Ordinary preservative-treated lumber is not automatically fire-retardant-treated wood. RezWood 3300 combines its preservative package with documented ASTM E84 surface-burning performance for projects that want that added performance but do not require code-defined FRTW.
Public technical record
The proof that can be shared.
This summary identifies the public standards, certifications, and application limits that help a project team evaluate the treatment. Evaluation-report identifiers, formulation details, concentrations, and proprietary process information are intentionally excluded.
GREENGUARD Certified for low emissions
The supplied certification covers the finished 3300 system tested with wood under UL 2818 for low chemical emissions.
ASTM E84 surface-burning performance
Documented dimensional SPF, Douglas fir, and Southern pine achieve a Class A surface-burning classification. The classification must follow the exact substrate.
Third-party evaluated applications
Independent technical evaluation supports approved preservative and surface-burning applications under the documented building-code conditions.
Not a substitute for required FRTW
3300 adds documented surface-burning performance, but it is not represented as fire-retardant-treated wood. Where the code requires FRTW, specify an approved FRT system such as 4400.
Important context
Technical fit: UC1, UC2, and protected UC3A conditions. Texas Wood Tech currently offers RezWood™ 3300 in common dimensional lumber sizes. Engineered panels, large beams, and truss programs shown within the broader TechWood evaluation are not part of the current RezWood™ offering.
Eligible project coverage
Coverage matched to the treatment.
Eligible RezWood™ 3300 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.
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.
01What it does
Added fire performance—without confusing it with FRTW.
3300 occupies a very specific place in the RezWood™ family: it adds tested surface-burning performance to preservative-treated lumber when a project wants a stronger fire story, but the applicable code does not require fire-retardant-treated wood.
Read the rating by substrate
In the current third-party evaluation, treated dimensional SPF, Douglas fir, and Southern pine achieve Class A surface-burning classifications. Several evaluated engineered substrates are Class B, so the classification must follow the exact substrate specified. Request the Report through TechWood’s controlled technical-document process.
Use 3300 for the right reason
3300 is intended for conditions where FRT lumber is not required by code but Class A or Class B ASTM E84 surface-burning performance is desired. Where FRTW is required, specify 4400 instead.
Protect it from direct wetting
3300 is suitable for above-ground applications not exposed to liquid water. Protected exterior applications require the coating, flashing, and finish details described in the current report.
Whole-home dimensional framing packagesInterior wall framingJoists and raftersStuds, plates, and sill platesCommercial and multifamily framingProjects requesting added E84 surface-burning performance
02What we protect against
Protection built into 3300.
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.
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.
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.
ASTM E84 surface-burning performance
ASTM E84 classification is substrate-specific; dimensional SPF, DF, and SYP achieve Class A values in the current report The documented surface-burning classification follows the exact treated substrate and is not a substitute for fire-retardant-treated wood where FRTW is required.
Important context
Ordinary preservative-treated lumber is not automatically fire-retardant-treated wood. RezWood 3300 combines its preservative package with documented ASTM E84 surface-burning performance for projects that want that added performance but do not require code-defined FRTW.
03Certifications + fit
The proof that can be shared.
This summary identifies the public standards, certifications, and application limits that help a project team evaluate the treatment. Evaluation-report identifiers, formulation details, concentrations, and proprietary process information are intentionally excluded.
GREENGUARD Certified for low emissions
The supplied certification covers the finished 3300 system tested with wood under UL 2818 for low chemical emissions.
ASTM E84 surface-burning performance
Documented dimensional SPF, Douglas fir, and Southern pine achieve a Class A surface-burning classification. The classification must follow the exact substrate.
Third-party evaluated applications
Independent technical evaluation supports approved preservative and surface-burning applications under the documented building-code conditions.
Not a substitute for required FRTW
3300 adds documented surface-burning performance, but it is not represented as fire-retardant-treated wood. Where the code requires FRTW, specify an approved FRT system such as 4400.
Important context
Technical fit: UC1, UC2, and protected UC3A conditions. Texas Wood Tech currently offers RezWood™ 3300 in common dimensional lumber sizes. Engineered panels, large beams, and truss programs shown within the broader TechWood evaluation are not part of the current RezWood™ offering.
04Warranties
Coverage matched to the treatment.
Eligible RezWood™ 3300 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.
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.
Technical clarity
Know exactly what
you are specifying.
Current RezWood™ availability
Texas Wood Tech currently offers RezWood™ 3300 in common dimensional lumber sizes. Engineered panels, large beams, and truss programs shown within the broader TechWood evaluation are not part of the current RezWood™ offering.
Water-based, mineral-centered protection
RezWood™ uses a custom water-based, mineral-centered wood-treatment blend; formulation details, ingredient concentrations, and process controls remain proprietary. The technical evaluations include AWPA E12 reaction-with-metals testing, while fastener selection still follows the exact treatment, exposure, building code, and connector manufacturer’s guidance. RezWood™ 3300 is represented by supplied certification for a system tested with wood under UL 2818 for low chemical emissions. After treatment migration and full drying, company-approved language describes the finished treated wood as non-hazardous for normal construction handling. Cutting any lumber creates wood dust, so use appropriate dust control, eye protection, hygiene, and job-specific PPE. Never burn treated wood; reuse and disposal depend on local rules and facility acceptance.
Third-party evaluationControlled technical documentRequest the Report ↗