Fire Retardant Treated Wood Interior


Wood treated with Dricon® FS reduces flamespread and smoke development and its ability to maintain its structural strength in a fire is enhanced. Although other fire retardant wood products and laminates are available, some suffer from heat degradation problems. Furthermore, laminates treated on only one side of the sheet do not offer thorough protection from heat spread and combustion.


Unlike similar products, Dricon® does not pick up excessive moisture, even at a relative humidity of 95%. Tests show that Dricon® is no more corrosive than untreated wood, even when the relative humidity reaches 100%.

How It Works — Passive Protection

An important feature of Dricon® FS FRTW is that it responds to exposure to fire. Dricon® chemicals react with combustible gases and tars normally generated by untreated wood and convert them to carbon char and harmless carbon dioxide and water. Wood loses strength in a fire only as its cross section is reduced. The surface char acts to insulate underlying wood and slows the rate at which the cross sectional area is reduced in size. The carbon dioxide and water vapor dilute the combustible gases to help reduce flame spread.

Dricon® FS

Dricon® FS FRTW is intended for interior and weather protected applications. Dricon® FS FRTW has proven itself in countless structures of many different types. Plus, it is backed by a 40-year limited warranty.

Fire retardant treated wood has been used for decades in multi-family housing and institutional buildings. As more homes are built near forests and wildlands, the threat of fire is increasing to residential property and inhabitants. Dricon® FS FRTW provides an extra measure of safety for these homeowners.

Dricon® FS FRTW also provides greater design latitude for the architect, engineer, and contractor, and removes many barriers associated with conventional noncombustible materials such as masonry and steel. The use of Dricon® FS FRT wood can result in greater safety, reduced insurance rates, and easing of building code limitations. It offers all of the environmental and other advantages of wood, plus fire retardance.


Stains, sealers, varnishes, and paints can be used with Dricon® FS FRTW. Paint systems may be water- or oil-based. Stains, especially dark colored semi-transparent types, should be solvent-based to avoid possible surface crystallization of the fire retardant chemical. Flammability of finish should be considered prior to application. A light sanding and thorough wiping should be performed prior to the application of any finish to provide a clean surface and to smooth any raised grain. In the case of rough sawn lumber or textured plywood, brush the surface prior to staining. Take precautions at the job site to protect the treated product from exposure to rain or extreme dampness if finishes are to be applied. As with untreated wood, excessive surface moisture can cause finishing problems. It is recommended that finishes be tested in an unobtrusive area to ensure satisfaction. Normal marking from treatment will show unless surface preparation prior to finishing is conducted. When clear or semi-transparent finishes are to be used, take careful note of the appearance characteristics of Dricon® FS FRTW.


Dricon® FS has an ICC-ES Evaluation Report 4584. For design professionals that are responsible for ensuring that both safety and structural elements have been addressed, reference ESR 4584.

Approved application to building codes from 2006 to 2021 for both the IBC and IRC codes.

Dricon® FS treated wood has been evaluated in accordance with AC66 requirements.

Dricon® FS treated wood qualifies as an Interior Type A (HT) fire retardant wood in accordance with the American Wood Protection Association (AWPA) Standard U1, Commodity Specification H, Use Category UCFA.

Dricon FS fire retardant is a proven successful formulation based on the American Wood Protection Association P50 Standard for Fire Retardants.


Per Unit
1X4 416 8-10-12-14-16-18-20
1X6 256 8-10-12-14-16-18-20
2X3 256 8-10-12
2X4 208 8-10-12-14-16-18-20
2X6 128 8-10-12-14-16-18-20
2X8 96 8-10-12-14-16-18-20
2X10 80 8-10-12-14-16-18-20
2X12 64 8-10-12-14-16-18-20
GRADE: Lumber STD #2/BTR
Plywood 4 to 5 ply
Timbers #1, #2/BTR
CABO R 802.1.1 R 803.2.1.2
  Download the Dricon® Fire Retardant
Treated Wood Warranty Agreement
1/4 - 120 sheets 3/4 - 44 sheets 1/2 - 66 sheets
1/2 - 66 sheets 1 1/8 - 30 sheets  
4/8 - 53 sheets   STRUC 1
3/4 - 44 sheets    
3/4 4x10 - 44 sheets   3/8 - 88 sheets
    1/2 -66 sheets


  Download the SDS for Dricon® Fire
Retardant Treated Wood