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Frequently Asked Questions – Durapine


1.  Can I paint or stain DuraPine Residential Outdoor wood?
Yes, you can stain or paint DuraPine treated wood.  You can also coat this wood with a water repellent; in fact, we highly recommend it. The best way to tackle these jobs depends on the wood you have, its exposure, and the coating you plan to use.  For detailed information, click here.

2.  How long must you wait before the wood is dry internally?
The time it takes for wood to dry out depends on the climate and the wood’s exposure. In summer in the American southwest, deck lumber open to sunshine can dry in a few days. In cool, damp weather or when shaded by an overhanging roof or tree, it will take much longer for wood to dry. As a fairly safe average, we recommend waiting six months before applying paint.

3.  What maintenance is needed for the product?
No maintenance is needed to renew resistance to fungi and termites.  DuraPine treated wood has a lifetime limited warranty against these organisms.  However, protection is required to maintain the wood’s appearance against weather.  Sun and rain cycles cause stresses in lumber and result in swelling, shrinking, warping, and cracking.

• To help protect your project against moisture damage, apply an effective brand of
water repellent as soon as your outdoor wood project is finished or, for large projects,
as sections are completed. Water repellent should be applied every year or two.

• To revitalize a dingy appearance caused by dirt and mildew, use deck brightener to clean
the outdoor wood.

To validate the warranty in some states and for some species, apply an end-cut solution.

4.  Where do I get DuraPine Treated Wood?
To locate a retail dealer near you please select Where to Buy.

5.  Is DuraPine Outdoor wood safe?
A comprehensive study of occupational, residential, and playground uses of wood pressure-treated with copper azole preservative has concluded, “no adverse health effects are expected.”  Believed to be the first independent human health risk assessment of the new generation of treated wood products, the study was commissioned by Bayer Chemicals Corporation (now Lanxess Corporation) and conducted by Gradient Corporation, a noted environmental and toxicological consulting firm. Lanxess manufactures Preventol® A8, which is an azole fungicide used in the copper azole preservative.

A number of different exposures (e.g., inhalation, incidental ingestion, exposure to the skin) were assessed and aggregated in each of these scenarios. The highest potential risk was estimated to be 17 times lower than the level that the EPA uses as a safety benchmark, thus demonstrating the safety of copper azole-treated wood.  View the report summary (PDF).

6.  How is DuraPine Treated Wood produced?
Wolmanized® wood is made in a pressurized cylinder using a closed system that recycles excess preservative for future use and releases no air pollutants nor wastewater. Only licensed producers who follow stringent quality control measures make Wolmanized wood.  The basic treating process is simple and highly controlled.

1 — Lumber, timbers, or plywood is loaded onto small rail or tram cars.  The trams are moved into
a large, horizontal treating cylinder.
2 — The cylinder door is sealed and a vacuum is applied to remove air from the cylinder and the
wood cells.
3 — Preservative solution is then pumped into the cylinder.
4 — The pressure is raised to about 150 pounds per square inch, forcing the preservative into the wood.
Treating time varies depending on species of wood, commodity being treated, and the
amount of preservative to be impregnated.
5 — At the end of the process, excess treating solution is pumped out of the cylinder and back to
a storage tank for later re-use.
6 — A final vacuum removes excess preservative from wood cells.  The cylinder door is opened and the
trams are pulled out.  The wood is wet, so it is kept on a concrete pad until any dripping ceases.

7.  Should I be concerned about the marks on my kiln dried decking?
During the process of Kiln Drying, lumber is separated by slats or “sticks” to ensure proper and consistent movement of air around and between the boards. It should be noted that this process may create what the industry calls “sticker” marks. These marks will fade, depending on the sun exposure this can happen fairly quickly, but could take several weeks. If the appearance of the “sticker” marks is a concern we recommend waiting for them to fade before staining or sealing the boards. Click here to view before and after photos. (Kiln Drying Stick Marks).

8.  Does DuraPine Outdoor wood come with a water repellent?
A compatible water repellent additive to provide built-in moisture protection is available in some areas. (Also, Thompsonized® Wood is high grade material that has factory-applied waterproofer. For more information, click here.)

9.  What are the environmental benefits of DuraPine Outdoor wood?
Unlike plastics, steel, and concrete, DuraPine wood is made from a renewable resource grown on managed timberlands. It requires less energy to produce than plastics and offers greater insulation value; and, because of its lighter weight, preserved wood can often be installed with lighter equipment which has less environmental impact.  Wood products reduce greenhouse gasses, and preservative treatment extends their service life. For more information, click here.

10.  Do you offer building plans for decks and outdoor projects?
Yes.  See the Homeowner section for detailed information on building a deck, as well as building plans for many popular backyard projects.  Also, see deck building tips.

11. What are the strength properties of DuraPine Outdoor wood?
This wood has the same strength properties of untreated wood of the same species, grade, and moisture content.

12. What hardware is recommended for DuraPine Outdoor wood?
For detailed information on recommended hardware for Wolmanized Outdoor wood, please click here.

13. How do I dispose of DuraPine Outdoor wood waste?
Wolmanized wood waste, such as scraps, broken boards, and sawdust, can be disposed of with ordinary trash collection. Neither the wood nor the preservative residues are considered hazardous wastes. If a particular landfill has restrictions against traditional treated wood, it may accept Wolmanized Outdoor wood. Treated sawdust and shavings are not recommended for composting, mulching, or animal bedding, and the wood should not be burned except in approved commercial incinerators.