1. Does it meet building codes?
Yes. FRX® wood meets the performance requirements of the
model building codes.
2. Can it be painted or stained?
Yes, though not all paints and stains are compatible with
exterior fire retardant treated wood, due to the nature of
the polymer. For an up-to-date listing of acceptable
coatings, click here. Follow the manufacturers'
recommendations for best results. As with untreated lumber,
the surface should be clean and dry. It is also recommended
to apply coating to a sample piece before overall
application to determine compatibility and desired
appearance. Flammability of the finish should be considered
before any application.
3. What species can be treated?
At the present time, Douglas fir, hem-fir, southern yellow
pine and western red cedar.
4. Can FRX wood be used in ground contact?
FRX® wood can be used outdoors, but is intended only for
above ground uses.
5. Is there a reduction in strength compared to untreated
Yes. The treating and drying processes cause a reduction in
strength that varies with treatment, species of wood,
applications and specific properties. Adjustment factors for
FRX® wood are shown previously in the Strength Properties
section of this site.
6. What types of fasteners should be used with FRX wood?
Galvanized steel hardware is recommended. Although the FRX®
wood treatment does not increase the corrosion of bare
steel, the galvanizing process provides an extra margin of
safety in wet environments.
7. Can I cut FRX wood?
Yes. Cutting lengths, drilling holes, and light sanding are
permissible. It is not necessary to field-treat cut ends to
maintain the flame spread rating. FRX® lumber should not be
ripped or milled. FRX® plywood can be ripped or cross-cut.