Why use ProWood pressure-treated lumber?
Lumber's greatest enemy is biological attack — destruction by termites, fungi and marine borers — as well as damage from rain, sun and wind. Thanks to over 50 years of research, ProWood® can stand up to every threat for decades of use.
What preservatives are used for pressure treating ProWood and how long are they effective?
For a long time, CCA (Chromated Copper Arsenate) was the primary wood preservative. CCA-treated wood protects against all major forms of destructive attack and is effective for many years. More recently, preservative manufacturers switched to ACQ (Alkaline Copper Quaternary). ACQ is also effective for decades, reducing demands on forest resources. Another common preservative is a solution containing natural, environmentally safe mineral salts called borates. Borate lumber has a powerful barrier against termites — even the extremely destructive Formosan termite. The new generation of pressure-treated wood uses micronized copper as a preservative. This method enables ProWood to stand up against termite damage and fungal decay.
How do you treat ProWood with micronized Copper?
Universal Forest Products utilizes a treatment method developed by Koppers (formerly Osmose), which uses micronized copper preservatives to help protect ProWood against termite damage and fungal decay. This preservative system features an innovative technique in which copper is milled into sub-micron-sized particles. These copper particles are then suspended, instead of dissolved, in the wood preservative solution used during the pressure treatment process.
Micronized copper eliminates the need for a solvent, which is required in other treatment methods. As a result, ProWood delivers better performance, better corrosion properties, and has a fresh, more natural appearance.
When is special handling required?
Our warranties outline specific handling tips.
The most important precaution is DO NOT BURN TREATED WOOD. When pressure-treated wood is burned, the preservative chemicals concentrate in the ash and may be inadvertently inhaled. Wear gloves when handling treated lumber, and always wear safety goggles and a dust mask when sawing or cutting treated lumber, just as you would with untreated lumber.
When should I apply wood sealer to pressure-treated lumber decking?
Climate change will affect when and how often wood sealer needs to be applied. To maximize surface protection and to keep your deck looking good, apply a quality wood sealant that contains an ultraviolet stabilizer.
Know when to apply a wood sealer by dripping water onto the deck surface. If the water quickly absorbs into the wood it's time to apply a wood sealer — If the water droplets bead up, your deck is protected. Be sure to test annually.
How safe is ProWood?
ProWood treated wood is very safe when used as directed in the appropriate applications. The preservative injected reacts with the wood to form an insoluble complex that won't evaporate or vaporize. ProWood is clean, odorless, non-staining, and safe to work with and handle. Its built-in protection is non-irritating for dermal contact with children, adults, animals and plants. We have carefully and exhaustively studied the minute amounts of preservative released during a ProWood structure's serviceable lifetime. The conclusion is clear: ProWood is also safe, long-term, for the environment and for contact with people and pets. In our opinion, ProWood MCA treated wood — as with any wood product — should not be used where household pets would be likely to chew or ingest the wood. The process used to treat ProWood is the first to gain Environmentally Preferable Product (EPP) as certified by Scientific Certification Systems (SCS). Scientific Certification Systems is a third-party certification services and standards development company. According to the EPA, to be EPP certified means that the product has a reduced impact on human health and the environment when compared to other products that serve the same purpose.
Do you recommend painting ProWood treated wood?
Although ProWood provides a surface that is easier for paints to cover, we do not recommend painting it. ProWood does not need protection from the elements. But if your decorative decisions call for paint, make sure the wood is dry before application. (Pour some water over the surface. If it beads, wait; if it seeps into the wood, it's ready to paint.)
Is ProWood pressure-treated wood Building Code approved?
You should always consult your local building codes before application. When working with ProWood pressure-treated decking, lumber and timbers, you'll want to locate the double box symbol on the end tag. The double-box symbol is required for building code compliance; indicating the standard authority and the third party inspection agencies. Generally, ProWood decking, lumber and timber products will carry the double box symbol demonstrating that they are code compliant when used in the right application.
Can ProWood be used for gardening?
Yes. Treated timbers used to construct raised vegetable gardens and flowerbeds are increasingly popular and practical. Recent scientific tests prove there is no significant uptake of preservatives into plants. And treated wood used for tomato stakes, flowerbed edging, planters, retaining walls, trellises and compost bins have the added advantage of lifetime durability.
Is it okay to install an under-deck ceiling system to my elevated wood deck?
If you intend to install an under-deck ceiling system, UFP’s general guidance is that the homeowner/builder must ensure that the ceiling system is well ventilated, drainage systems have proper slope and the system prevents debris from accumulating. The homeowner must use building code compliant ground-contact treated materials (UC4A) for all parts of the structure, including the decking. Systems with poor ventilation (or no ventilation) should not be used, as even ground-contact pressure-treated lumber may not provide adequate service life.
How do I remove the ink stamp from my ProWood pressure-treated lumber?
The ink used for marking pressure-treated lumber grades (applied at the lumber mill, not a UFP pressure treating plant) is a water-based ink that will naturally disappear over time from weather and foot traffic. Some builders and DIYers speed up the process by scrubbing it with soap and a scouring pad or soft bristle brush. This process will help reduce the contrast, but will not totally eliminate the mark. Always test in an inconspicuous spot or on a scrap piece of lumber. Consider the same treatment for pencil marks.
What is the significance of the tags stapled to my lumber?
Universal Forest Products attaches end tags to all of its ProWood lumber to ensure that our customers know key information about the product. The tags can include information about available warranties, whether or not the product is for direct ground contact or strictly above-ground applications and, where applicable, details for acceptance by local building codes. Many of the tags on ProWood products also have detailed information on the safe handling of ProWood, the same information contained in the warranties.
Are there different types of ProWood for different applications?
Yes. Our tags will always state "above ground only" or "ground contact" so you can be sure you are using the right material for the job. ProWood products containing higher levels of preservatives are available for special purposes such as projects requiring extensive moisture/earthen contact –– including foundations, pole barns, docks and culverts. For more details, refer to the Understanding the End Tag page.
Should I space my pressure-treated deck boards during installation?
Ultimately, your deck boards should have an edge gap between ¼ inch and ⅜ inch to allow for proper ventilation and for debris to pass through.
Brush-on Preservatives for Field Cuts
However, most pressure-treated lumber decking that is sold through lumberyards and box retailers has high moisture content (meaning it’s wet) — so the boards are swollen. Always butt wet boards tight against each other or leave a minimal gap. Your wet deck boards will contract and create a wider gap as they dry. This could happen in a relatively short period of time (days to weeks) or may take longer depending on your climate and exposure to the sun.
If the wood is dry or has been kiln dried, such as ProWood Kiln Dried, install deck boards with approximately ¼ inch
gap to allow for proper ventilation and for debris to pass through.
Wet or dry, boards should be installed tight end-to-end.
Note: Each piece of lumber is different and the change in width can vary as each board dries.
According to AWPA's Standard M4-06, lumber and timber that are used in above-ground applications and are of sapwood species such as Southern, red or ponderosa pine, generally do not require treatment to provide a good service life. This category includes most ProWood lumber and products. Other heartwood species typically found in the western U.S. should be field treated when cut or drilled. If you are concerned about wood exposed after cutting or drilling, you can use a brush-applied preservative. Home centers and lumberyards often carry brush-applied preservative systems based on two different active chemicals: either copper naphthenate or IPBC (3-iodo 2-propynyl butyl carbamate). These systems should be applied in accordance with their labels to any surface exposed by damage or field fabrication. Users should carefully read and follow the instructions and precautions listed on the preservative system label when using them.
After my project is built, is any special maintenance necessary?
ProWood is designed to give professional-grade results that last. Left unfinished, it ages gracefully, eventually softening to an attractive driftwood gray. On flat surfaces such as decks, however, leaves and other debris may collect and create unsightly stains. Even if your lumber has the locked-in protection of factory-applied water repellent, you'll want to follow an annual maintenance program that includes a semitransparent stain or a sealant which contains an ultraviolet stabilizer. If you stain your project, a quality penetrating latex or oil base stain is recommended.
Does ProWood qualify for continuing education learning credits?
Yes, through Koppers Performance Chemicals, our preservative supplier. The Osmose program is unique within the treated wood industry because it offers AIA professionals the opportunity to receive credits under the Sustainable Design (SD) CE requirement as well as GBCI CE requirements for all LEED Professionals.
ProWood FR (Fire Retardant)
In what applications can ProWood FR fire-retardant treated wood be used?
ProWood FR fire-retardant treated lumber is typically specified for use in areas not exposed to the weather or wetting and where the adopted building code permits the use of wood or fire-retardant treated wood. ProWood FR fire-retardant treated wood is typically permitted for interior, above ground applications such as: roof systems, studs, flooring, joists, sill plates (when not in direct contact with the ground), blocking and furring, and other interior applications.
Can I apply a paint or stain to my ProWood FR treated wood?
Yes. Under normal temperature and humidity conditions, latex and oil-based paints, as well as water- and solvent-based stains, can be used with ProWood FR treated wood. If prolonged exposure to high humidity conditions is expected, special surface preparation procedures including the use of an appropriate primer are recommended. Before applying any finish, the wood surface should be lightly sanded, cleaned and dry. For best results, always follow the coating manufacturer’s label instructions.
What if ProWood FR is exposed to rain on the jobsite?
ProWood FR must be stored off the ground and protected from weather to prevent loss of the protective chemical treatment. Likewise, exposure during construction should be minimized. If some exposure occurs, the material must be allowed to dry to its original specification before being covered.
What nails or bolts should I use with ProWood FR?
Galvanized steel hardware is recommended for use with ProWood FR wood. Even though the ProWood FR treatment does not increase corrosion of bare or galvanized steel, galvanizing provides an added level of protection with any treated wood product. The following metal fasteners are compatible with ProWood FR wood and are outlined in ESR-4373: 2024-T3 aluminum, SAE 1010 steel, hot-dip zinc galvanized steel, copper or red brass.