Rot protection

Help preserve the structure.

Fungal-decay resistance supports the long-term performance of eligible treated wood within its documented exposure conditions.

See matching treatments ↓

Decayed floor in a summer house · documentary photograph

Photo: SeppVei, Wikimedia Commons. Public domain.

Durability begins with good detailing.

Decay fungi and surface mold are different problems. Decay can break down wood over time. Treatment adds resistance to fungal decay, while drainage, flashing and ventilation keep the assembly from holding moisture.

Choose a treatment for the actual above-ground exposure.
Flash vulnerable connections and keep horizontal surfaces drained.
Repair water intrusion and maintain required finishes.

What supports the protection?

The public evaluations document fungal-decay resistance for approved lumber and applications. Exposure limits still apply; resistance to decay does not automatically qualify wood for ground contact or permanent wetting.

What are the limits?

The treatment cannot restore already-decayed wood, fix a leak or replace structural design and maintenance. Exterior-finish requirements must be checked for the selected system.

How do warranties fit in?

Coverage depends on the selected treatment, eligible wood, project records and complete written terms. A warranty is a defined remedy, not a promise that damage can never happen.

Review rot warranty options ↗

Choose your system

Treatments for rot protection.

3-in-1 framing protection

2200

The foundational green RezWood™ treatment for qualifying dimensional framing—factory-applied protection against mold growth, fungal decay, and subterranean termites, including Formosan termites. Installation, field cuts, fasteners, and exposure details must follow TER 1511-09.

See 2200 ↗See its warranty options ↗

3-in-1 outdoor durability

2200EX

Coming soon · not yet available to order

RezWood™ 2200EX extends mold, decay, and subterranean-termite protection into documented above-ground exterior uses, adding water-repellent and color components for wood that will face the weather.

See 2200EX ↗See its warranty options ↗

3-in-1 protection + E84

3300

Coming soon · not yet available to order

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.

See 3300 ↗See its warranty options ↗

4-in-1 FRT protection

4400

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.

See 4400 ↗See its warranty options ↗