RezWood™—ReZilient™ wood by design—is factory treated before it reaches the frame with a custom, water-based wood-preservation blend. The documented systems inhibit mold growth and resist fungal decay and subterranean termites—including Formosan termites—before the lumber is covered by sheathing, insulation, and finishes.
Designed around the wood
Water-based. Mineral-centered.
RezWood™ is designed to preserve visible grain, familiar handling, and normal framing practices. Supplied GREENGUARD certificates cover the TechWood treatment systems used for REZWOOD™ TW2200, TW3300 and TW4400, tested with wood under UL 2818. Original certificates retain their issuer’s product names and scope. This is not a claim of chemical-free wood or skin-contact safety.
The same threat can call for a different treatment.
“Treated” is not a universal performance claim. The exact preservative system, exposure rating, and technical documentation determine what the lumber is designed to resist.
Mold growth
RezWood systems document mold-growth inhibition for the treated lumber. Conventional pressure-treated products vary, so mold performance should be confirmed from the exact product rather than assumed from the word “treated.”
Fungal decay
Both categories can resist decay when the treatment and Use Category match the exposure. Pressure-treated products remain available for ground-contact conditions that current RezWood products do not claim.
Wood-boring insects
Both categories can be specified for insect resistance. RezWood product and warranty language identifies the covered system, lumber, exposure, and listed termites; untreated wood remains outside that protection.
Fire performance
Preservative treatment is not automatically fire-retardant treatment. RezWood 3300 adds documented surface-burning performance but is not FRTW; RezWood 4400 is the code-driven fire-retardant system and must follow the documented assembly or application.
Moisture and the frame
Why preventing mold matters
Mold spores are common indoors and outdoors. Growth needs moisture. Federal guidance is to control that moisture, dry wet materials, and keep indoor humidity in check. These figures describe buildings in general. They are not a claim that RezWood™ lumber protects people, reduces asthma, or prevents illness.
About 3%
U.S. households reported signs of mold in the prior year in the 2019 American Housing Survey. That is a self-report of signs of mold, not a laboratory measurement.
About 1 in 6
Households reported a leak, dampness, or mold item when those 2019 survey questions are combined. The combined figure is broader than mold alone.
About 47%
Pooled questionnaire studies estimate this share of homes had any sign of dampness or mold. That is not a count of measured mold, and it is not an EPA or CDC figure.
In the 2019 American Housing Survey, about 3% of households — roughly 3.6 million — reported signs of mold in the prior 12 months. Renters reported it more often than owners (4.4% and 2.1%). Hidden mold can be missed by a survey question, and the figure is still a self-report. HUD No. 20-147
When national survey questions about water leaks and mold are read together, roughly 15.9% of households — about one in six — reported a dampness- or mold-related condition that year. Chu et al., Environmental Health, 2022
Reviews compiled by Lawrence Berkeley National Laboratory put the population-weighted average for “any dampness or mold” at about 47%. The largest study in that set reported 50% for the same broad category. Those studies are mostly occupant questionnaires. “Dampness or mold” is wider than “has mold,” and EPA and CDC do not publish this prevalence. Lawrence Berkeley National Laboratory
The practical control step in EPA’s brief guide is moisture: dry wet materials, and limit indoor humidity. Spores themselves are part of the outdoor and indoor environment. EPA, A Brief Guide to Mold, Moisture, and Your Home
General building health
What health agencies have linked to damp, moldy buildings
The Institute of Medicine (2004) and the World Health Organization (2009) link damp indoor spaces and mold with upper-respiratory symptoms, cough, wheeze, and asthma symptoms in people who already have asthma. CDC and NIOSH describe the same pattern: excess moisture drives indoor mold growth, and damp, moldy buildings are associated with breathing problems. Institute of Medicine, 2004World Health Organization, 2009CDC/NIOSH
Some studies also find an association with mood. A 2007 study of adults in eight European cities found that damp or moldy housing was associated with depressive symptoms after other factors were taken into account. The authors did not establish that mold causes depression. Shenassa et al., American Journal of Public Health, 2007 A 2024 review reported positive associations between dampness or mold and anxiety or psychological distress, drawn mostly from studies that measure people at one point in time, so cause and effect remain unproven. Environmental Health Perspectives, 2024
This is general education about buildings. It is separate from any claim about treated lumber. RezWood™ claims on this site stay limited to protecting the wood itself.
Open framing
RezWood helps inhibit mold, and resist rot and termites, from the start — even while the house is being built
RezWood™ lumber is factory treated before it reaches the frame. The treatment is meant to help inhibit mold growth on the lumber surface and to resist fungal decay and wood-destroying insects, including Formosan termites, while the frame is still open to weather and after finishes cover it. The protection applies to the treated lumber. Whole-house mold still depends on leaks, humidity, drying, and materials that were never treated.
Kiln-dried framing can still support mold if it stays wet. USDA Forest Products Laboratory research found heavy surface mold on untreated kiln-dried southern pine after 7 days when the wood was kept wet under favorable laboratory conditions. The test rated surface coverage. It did not measure rot through the piece, and a brief rain that then dries is a different situation from lumber held wet. Clausen and West, Forest Products Journal, 2005
Closed or tightly wrapped bunks that take on rain hold water against the lumber and slow drying. That raises the chance of surface mold. Store packages so they can dry, off the ground, and under a cover that does not trap water. Southern Forest Products Association
Repeated rain before dry-in, especially in warm humid weather, can keep wood above a moisture content that supports surface mold between storms.
Surface mold is a moisture signal on the face of the wood. Decay fungi need the wood to stay wetter for longer, often around 25–30% moisture content or more, before they threaten the structure.
Factory treatment adds protection for the lumber during construction. It does not lower moisture content, and framing still needs to be dried before it is insulated or enclosed. The written limits are on the mold topic and in the limited warranty.
Moisture content
What happens when wood gets wet
Rain or water trapped in storage raises the moisture content of kiln-dried lumber. Prior kiln drying does not leave that lumber unable to grow mold once it is wet again. If the wood stays warm, damp, and short on airflow, surface mold can appear over days to a few weeks. In the Forest Products Lab test above, untreated southern pine showed heavy surface mold in 7 days when the pieces stayed wet.
EPA and NIOSH recommend drying wetted building materials within 24–48 hours when that is practical. That is a prevention window. It is not a measurement that mold always begins 24 hours after rain. EPA mold guidanceNIOSH remediation guidance
Before walls are closed, check the wood with a moisture meter. Dry framing to roughly 19% moisture content or below before insulating or enclosing it. ENERGY STAR and the Building America Solution Center recommend not enclosing materials that are still too wet, often using 18% as the close-in target. Building America Solution Center Forest Products Lab drying guidance treats lumber below about 20% moisture content as outside the usual range for ongoing fungal activity. Surface mold can still be a concern nearer 16% moisture content when the surrounding air stays very humid. APA moisture guidance
Surface mold and rot are different fungi. Mold uses moisture on the face of the wood and, by itself, is not a loss of structural capacity. Rot breaks down cell walls and needs higher moisture for longer. Seeing surface mold on studs is a reason to dry the wood and confirm the meter reading. It is not, by itself, a finding that the lumber has rotted.
A borate-based factory treatment can help inhibit mold on the treated lumber surface and resist fungal decay and wood-destroying insects. It does not pull water out of the wood. It does not replace covered storage, ventilation, or a moisture-meter check before close-in, including before spray foam. Foam makers still require a dry substrate.
From the framethrough the finish
From start to finish protection
The frame disappears. The protection stays.
A finished home can hide thousands of feet of structural lumber. RezWood™ puts protection into that material before it is covered—then good drainage, flashing, ventilation, drying, inspection, and maintenance help the whole building perform.
Scope of protection
RezWood™ protects the bones of your building.
When RezWood™ is used throughout the framing package, the treated studs, plates, joists, and other structural members carry the documented protection—helping protect the parts that matter long after the finishes go on. Cabinets, trim, furniture, sheathing, and other untreated wood or cellulose materials remain outside that protection. Routine inspection is still a good idea because it can identify activity affecting materials that were not treated with RezWood™.
RezWood™ treatment is available for common dimensional framing lumber in familiar sizes and stock lengths—so builders can specify protection without reinventing the frame.
Commonly treated
Southern Yellow Pine
A familiar structural species available across RezWood™ treatment programs.
SYPCommonly treated
Spruce–Pine–Fir
Common SPF framing lumber treated for the selected RezWood™ protection system.
SPFUpon request
Douglas Fir + others
Douglas Fir and other suitable softwood species can be evaluated for availability and treatment upon request.
DFCommon dimensions
Sizes + stock lengths
Available in common dimensional-lumber lengths. Confirm species, grade, size, and quantity when ordering.
2×42×62×82×102×12Common lengths
The company behind the treatment
Texas Wood Tech makes the wood better.
Texas Wood Tech is the treating company. RezWood™ is the protected-lumber brand delivered to builders, dealers, component plants, architects, and owners.
01
Treated in the USA
A Texas wood-treatment platform built around controlled production and identifiable products.
02
Built for real framing
Common dimensional lumber, familiar tools, and recognizable jobsite methods.
03
Documentation matters
Product selection, applications, warranties, and fire claims depend on current approved documents.
Supplier + applicator network
Find the wood. Join the network.
Approved RezWood™ sellers will appear here as the network grows. Contractors, dealers, component manufacturers, and potential suppliers can contact the RezWood™ team directly.
RezWood™ dealer networkLocations coming soon
Only approved sellers added by Texas Wood Tech are displayed.
Controlled directory
Built for a growing national network.
No public sellers listed
The directory is being built.
New locations will appear only after approval by Texas Wood Tech.
3-in-1 framing protection
3-in-1 outdoor durability
3-in-1 protection + E84
4-in-1 FRT protection
