MCQ Treated Wood

Your home center may have several options when it comes to pressure treated lumber for landscaping. You should know a few basic facts about each before you buy.

3”x5”x8’ landscape ties (nominal measurement)
Most 3”x5”x8’ pressure treated landscape timbers (LST’s) originate as the center cants from plywood veneer peeling mills. Logs are kept wet to make peeling easier and the peeled cants arrive at the pressure treatment plant without benefit of kiln or air drying. Lumber that is not dried before pressure treatment cannot be fully penetrated by the treatment solution during the treatment process. This will be reflected with a shorter term warranty—in the case of ProWood Micro CA treated lumber, one year—than would have been otherwised offered by lumber that had the advantage of full preservative penetration. These ties are not recommended for applications that call for in-ground, structural performance over several years, such as fence posts.
 
4x4 and 6x6 timbers (nominal measurements)
ProWood Micro CA timbers carry either a lifetime limited warranty or a one year warranty, depending on their intended end use. The surest way to know the difference between a timber made for landscaping and a timber made for a structural application is by the warranty. If the timber carries a lifetime limited warranty it means it was dried before pressure treatment and can be warranted for structural use. Generally, these timbers are building code approved and carry an Evaluation Service Report from ICC-ES, a third party testing agency. You can use timbers for fence posts, raised garden beds, retaining walls and any other projects that call for high performance over a long period of time.

End tags
Every piece of treated lumber in the store has an end tag, on which you should find the following:

• Third party testing agency
• Standard to which it is treated (ESR-2240 in ProWood Micro’s case)
• End use (ground contact or above ground, for instance)
• Wood preservatives used (ProWood Micro uses micronized copper azole)
• Treating company’s name
• Warranty
• Handling information

Eco Friendly Products
ProWood Micro treated wood products use the MicroPro treatment process which is certified under SCS's Environmentally Preferable Product (EPP) program. In addition to EPP status, the technology has earned Green Approved Product certification from the National Association of Home Builders (NAHB) Research Center.

Knowing the above information will help you make the informed choice when specifying your next outdoor landscape project.

The easiest way to renew your pressure treated wood deck is to thoroughly clean it of dirt and debris. Also, make sure all the lumber fasteners are countersunk into the surface. Scrub rust marks and stains from the surface, then sand down any visible imperfections in the wood deck surface with a portable walk behind sander. These deck sanders make quick work when sanding wood decks and can be rented from your local equipment rental outlet.

If a board's appearance can’t be revived, consider flipping the board and using the other face. If rot has set in or a plank is split, then you should replace the treated lumber deck board to ensure safety. Stain and seal the entire wood deck surface to protect it from the elements. By staining and sealing the wood surface you'll help restore your deck's appearance. And hopefully, for a few bucks and a little elbow grease, you'll be able to squeeze a few more summers out of your pressure treated wood deck.

ProSales Magazine’s editors have awarded MicroPro, the formulation used to treat ProWood Micro CA pressure treated lumber, their 2010 annual Editors' Choice Award. According to the editors, “Manufacturers introduce hundreds of new products every year. These few are the ones most worth your attention.” Selections were based on research from ProSales, plus expert reviews by other Hanley Wood publications.

We get this question a lot. The simple answer is pressure-treated lumber can be used in any interior application except cutting boards and countertops. Some have also asked, after they’ve found pressure treated lumber installed inside their homes, if there is any danger in having it indoors. The answer is no. There is no danger of either leaching or off-gassing. But these answers beg another question: Why would you use treated lumber indoors? The reason lumber is treated is to protect it from exterior elements that might cause rot, decay or termite infestation. In a protected environment there is no danger of rot or decay, unless the wood is exposed regularly to moisture, such as near a leaking pipe or window.

Some bathroom sub floor panel products are pressure treated as they may be exposed to moisture on a regular basis and some builders use borate-treated lumber, such as ProWood Borate, for sill plates in areas where termite infestation is common. In extreme areas of termite infestation, such as the US Gulf Coast and Hawaii, the whole structural shell may be constructed using ProWood Borate or other borate-treated lumber products. Other than those examples there would not be a need to use pressure treated lumber indoors.

Universal’s ProWood Micro CA pressure treated lumber uses the MicroPro technology developed by Osmose, Inc. On March 9, 2010 the US Patent and Trademark Office issued a patent for the MicroPro technology. Wood products treated with MicroPro, including ProWood Micro CA, are sold in over 5,000 lumber yards and home centers across the US.

The MicroPro pressure treated wood process is Environmentally Preferred Product certified by the testing organization SCS and has earned Green Product Award certification from the National Association of Home Builders Research Center.

The Southern Pine Council recently published its 2010 guide to specifying pressure treated wood: Pressure Treated Southern Pine – standards, specifications and applications. If you've ever had questions regarding this time-honored product line this document will answer them.

• Attributes of the Southern Pine species
• The pressure treating process
• Types of wood preservatives
• The Use Category system (a specifying guide)
• Code standards and building code requirements
• Design values
• Guide to grade and quality marks
• Fastener and connector recommendations
• Use and handling
• Green aspects of wood in general and pressure treated lumber in particular

Here’s the answer to the question of which brand of pressure treated lumber is best:
Universal’s ProWood^® Micro pressure treated lumber products use a wood preservative process that has received environmentally preferable product status. ProWood Micro pressure treated wood products have gained enthusiastic acceptance in the marketplace and are in thousands of retail locations. Its many features and benefits, including sustainability attributes, fastener advantages and performance, make it the choice of professionals and home owners everywhere.

Mold and mildew can be a nuisance on any exterior building surface, regardless of the material. If the conditions are right, they will spawn on wood, plastic, concrete, metal and other surfaces. Mold formation is most prevalent in consistently wet, shaded areas. Spores from the natural environment are carried by the wind and commonly land on decks surfaces. It is important to note that the appearance of mold and mildew is a function of nature, not necessarily a deficiency with any of the material on which it grows.

Deck Cleaning
Periodic washing with soap/detergent and water will help remove surface dirt. This will also help prevent the buildup of pollen, debris and spores that can cause and accelerate mold/mildew growth (it also helps to remove deck mold). Caution: A pressure washer should not be used to “blast” mold/mildew or soils from a deck surface. The abrasive nature of the water stream can potentially damage the material by driving the spores into the material, which may create a morechallenging problem to remediate. A pressure washer with a fan-tipped nozzle should be used only to lightly wet or rinse wood or composite deck surfaces. 

There are many deck wash and exterior cleaning products available at retail. It is important to make sure you use a cleaner specifically intended for your application. After selecting a product, be certain to read, understand and follow all instructions supplied by the manufacturer. Some cleaning products and inhibitors may be more effective than others, depending on the environmental conditions your deck is subjected to. Additionally, it is always a good idea to test the cleaner in a small, inconspicuous area prior to applying it to the entire deck.

Mold Inhibitors
As with deck washes, there are several mold-inhibitor products available from paint stores, hardware stores, online outlets and home centers to help prevent long-term mold/mildew growth. For any product selected, be certain to read, understand and follow all instructions provided by the manufacturer. Depending upon the environmental factors affecting your composite lumber or treated wood deck, some preventive cleaning products may be more effective than others. It may be necessary to try more than one product. For ongoing preventive maintenance, follow the manufacturer’s recommendation.

The process used to make the micronized copper formulation found in ProWood Micro CA was awarded Environmentally Preferred Product (EPP) status by Scientific Certification Services in December 2007. This was the first pressure treated lumber formulation to earn such status.

We are now pleased to announce that this same formulation has recently earned Green Approved Product Certification from the National Association of Home Builders (NAHB) Research Center. Now, ProWood Micro CA pressure treated lumber products are eligible to receive points toward a building being certified under both the National Green Building Standard and LEED. Go to the ProWood Micro CA Web site to read complete details.

There are interesting new developments in the Osmose vs. Viance court battle. Viance, a maker of treated wood chemicals, has claimed publicly competitor Osmose’s wildly popular pressure treated lumber formulation MicroPro, which is used by Universal in its ProWood Micro brand of treated wood, doesn’t work as advertised. Not sitting still for this, Osmose sued, and on March 24 a judge issued a temporary restraining order (TRO), forcing Viance to cease its attacks.

On September 29th, Osmose was granted a motion for preliminary injunction reaffirming that Viance must stop its negative marketing campaign against the MicroPro technology and micronized copper wood preservatives.  Viance tried hard to get the judge to lift the TRO and was denied with this ruling. By continuing the restraining order the judge has affirmed the court’s position that Viance must discontinue their attacks on MicroPro.

Both Osmose and Viance have sought injunctions against one other. They are almost mirrors of each another, both accusing the other of misleading statements and false advertising. The judge said “yes” to Osmose and “no” to Viance. Emphatically so, if you read the court order, available here: http://www.treatedwoodtruth.com/pdf/09-29-09-USDC-188-Order-on-Preliminary-Injunction-Osmose-vs-Viance.pdf

Of significance is the fact that Viance does not have any details of this latest ruling, with the exception of their own press release, on their Web site. The fact that the latest court order cannot be found there raises the question, "Why not?"

Various industry publications are lining up with Osmose on this issue. Their comments can be found here:

http://www.prosalesmagazine.com/industry-news.asp?referer=rss427&sectionID=427&articleID=1087411

And here:

http://www.remodeling.hw.net/blogs/postdetails.aspx?BlogId=tedsremodelingblog&postId=89675

Documents related to this case can be found on the treatedwoodtruth.com site, here: http://www.treatedwoodtruth.com/index.php

We are seeing some real innovation with wood treatments these days; whether it’s wood for decking, siding, or part of the structural frame. At the root of this topic is the fact that, when left untreated or when unprotected, wood can rot. Even premium species like cedar and redwood—which are naturally decay- and rot-resistant—require treatment to extend their useful lives.

Today’s wood treatments range widely from chemical treatments to heat treatments (a.k.a. “thermally modified wood”). And if you are looking for the green angle here, the simple fact that wood treatments can dramatically extend the life of the wood is a very “green” attribute indeed—in a life cycle analysis, it lowers the environmental costs of re-harvesting (and re-treating, and re-shipping and re-installing) replacement wood products. However, each wood treatment method has its merits, and each one has features that can make it more or less green. Let’s take a closer look by first reviewing a brief history of wood treatment.

Chromated Copper Arsenate (CCA)
For a long time, Chromated Copper Arsenate, or “CCA” was the formula for treating lumber. For decades, it was common to see “green” CCA decks – the green was the color of the oxidized copper. And CCA-treated wood was also commonly used in most ground-contact situations. In the ‘90’s new alternatives to CCA were introduced. None took meaningful market share from CCA because none could match its performance and value. As the millennium approached, there was increased scrutiny regarding the perceived safety of CCA as reported by various “consumer advocate” reporters and environmental organizations. In 2003, treaters voluntarily stopped using CCA for residential applications and newer, more expensive formulations replaced CCA. One bright spot that emerged from the demise of CCA was that the pace of innovation in preservative development quickened.

Alkaline Copper (ACQ) & Copper Azole (CA-B)
The replacement wood preservative treatments were ACQ and CA-B. Let’s first look at ACQ.  ACQ is a treatment consisting of alkaline copper, a fungicide, and quaternary ammonia (sometimes called quat), which serves as an insecticide. On the other hand, CA-B is a treatment containing mostly copper and azole; the azole is a fungicide that appears in various chemical forms. If you step back and take notice, there are two consistent elements in these approaches to wood treatment. One, they all are aimed at stopping rot, decay, fungus, and insects from getting to the wood.  And two, they all overwhelmingly contain copper, a natural, harmless wood preservative. As wood treatments have evolved, some wood treaters (and the chemical companies that license their formulas to these wood treaters) have stayed with copper. But they have eliminated other chemicals in their wood preservative formulations.

Micronized Copper (MCQ)
Among the most positive result was the recent introduction of a new micronized copper wood preservative. Developed by Osmose, Inc., and marketed as ProWood Micro (MCQ Treated Wood), the new process bonds microscopic copper particles to the wood cells. Because of this there is no need for a solvent (which is still used in most other non-micronized formulations) . These attributes have earned the ProWood Micro formulation Environmentally Preferrable Product (EPP) status from Scientific Certification Systems, a leading third party certification firm. This is the first and only such preservative to earn this recognition. To earn EPP certification, a product must demonstrate reduced impact on human health and the environment when compared to other products that serve the same purpose as measured by guidelines published by the U.S. Environmental Protection Agency.

Non-metallic
There is another relatively new product out today that is offered by Arch Wood Protection. The treatment is Wolmanized L³ Outdoor wood. It contains no copper as part of the preservative and uses a proprietary non-metallic preservative.

Boric Acid
Yet another class of wood treatment is focused on boric acid, as well as its oxides and salts which are called borates. Boric acid is a very-effective wood preservative. Conveniently, it is toxic to insects, but it has low toxicity with humans. That said, the problem with boric acid has always been that it is water-soluble. That means it can be floated into wood with water-based pressure treatments or applied with surface applications. But the boric acid will eventually leach out of the wood. That leaching process is dramatically accelerated if the wood is exposed to the elements. All of this means that wood treated with borates isn’t generally good for ground contact, and in any application, it has to be re-treated repeatedly with borate applications to ensure that the wood is preserved. Now, because borates have gotten another look from consumers, due to the perceived toxicity of alternative wood treatments, borates have seen some innovative uses. One company floats borate deep into wood fiber by mixing it with glycol, a kind of alcohol. The glycol flashes off, leaving the borate behind, and until the borate leaches out, it is a good termiticide, insecticide, and wood preservative. But here too, the wood has to be re-treated regularly.

Thermally-Modified Wood (TMW)
Another kind of wood treatment that you see gaining wider acceptance is heat treatment. Wood that is treated with heat is generally referred to as thermally-modified wood or TMW. This treatment process contains no chemicals or additives at all.  Like its name says, the thermally-modified process uses high heat and steam to change the very nature of the wood. In fact, the thermal process removes the aspects of the wood that serve as food. With no insects, fungus, or mold attacking the wood, the thermally-modified process can prevent for rot and decay. Specifically, the process removes or de-natures the sugars in the wood, leaving behind aspects of the wood that cannot be digested by insects or eaten by fungus and mold. After the wood is thermally treated, it can be stained, sealed, joined, and glued like regular wood.

No matter what type of treated wood you seek, you should be aware of its code acceptance. Some treatments are not code compliant, even though they have been around for a number of years. To get code approval, preservative companies can either work with the American Wood Protection Association (AWPA) to have their treated wood listed in the AWPA Standards. Or the preservative company will work with the International Code Council (ICC) Evaluation Service to earn an Evaluation Service Report (ESR). Without the support of either an AWPA listing or an ESR, there is no guarantee that a local code will allow a product on the job where treated wood is required. So, check the fact sheet from the wood provider or the wood treater to see if the wood is approved for use.

• Gates
• Hot tub enclosures
• Fence tops
• Arbors
• Gazebos and trellises

This alternative to pressure treated wood is surprisingly sustainable. The decking market offers dealers and contractors a clear opportunity that is growing in a number of ways. First is market size: The Cleveland-based Freedonia Group says that decking is expected to grow by about 20 percent annually to become a 3.6-billion-lineal-foot industry by 2011. Secondly, the decking market is growing in sophistication. Decking contractors are no longer banging galvy 10d nails in CCA #2 southern yellow pine, as we did in the 1980s. Today decks are part of so-called outdoor living space, and that has even developed into a designer specialty.

For dealers and contractors alike, decks and deck building material offer good-margin, low-maintenance products to customers, who are increasingly willing to pay premiums for products that they will proudly display in high-profile areas of their homes. Today, although decking is still a product that most general-contractors offer, you are seeing an increased number of specialty deck-only operations, and there is a great opportunity for dealers to cater to them.

Decking in the broadest sense of the word now includes four category of products: All-plastic decking, Wood, Composites, and—increasingly uncommon—Aluminum.

The all-plastic decking products are different from “composite decking,” which contains plastic and fiber (more on that below), and plastic decking breaks down into sub-categories by differentiating themselves from one another by the source and type of plastic, and sometimes by the plastic’s recyclability. The most popular choices of deck plastics break out into five categories:

1. Common HDPE  (#2, milk jugs);
2. Recycled high-density polyethylene plastic (ReHDPE);
3. Polypropylene (think Tupperware);
4. Solid polyvinyl chloride a.k.a. PVC;
5. Cellular PVC (polyvinyl chloride with a foaming agent).

 (It important to know the difference between the types of plastic, because they are also used in composite decking material.)

With so many kinds of plastic, manufactures of all-plastic decks will point out differences in the plastics they use, especially where the plastics come from. Marketers of decking will take great pride in features like “virgin plastic,” or a high percentage of “post consumer resins” (PCR), and even “100% recyclable.” Also, since plastic decking can be manufactured through extrusion (that is, product that is pushed through a mould), even the speed of extrusion can be a selling factor, because a product that is extruded too quickly is considered poorer quality.

Whether you are dealing with all-plastic decking or composites, HDPE is the most commonly used product. It performs very well in most situations, and expands only along its length, like vinyl siding. Plus, it does not swell, as many lumber products will. Manufactures argue that it retains color well. Plus, the all-plastic product is entirely recyclable.

Another product, all-plastic PVC decking generally has resistance to scratching, staining, and fading that is superior to composite decking. But PVC decking has been getting slammed for the toxicity of the manufacturing process, which can release mercury and dioxin. That said, there is a green case to be made for PVC’s performance and durability, and it goes like this: If you use PVC (in all-plastic or composite products), you are less likely to harvest, manufacture, and ship replacement products, which therefore makes PVC a viable alternative to wood. What’s greener: a 30-year plastic or PVC deck…or a wood deck that has to harvested, shipped, installed and shoveled into the landfill three times in those three decades?

Now, on to composite decking. It’s called composite or synthetic decking because it has more than one component, and this class of decking has some characteristics of wood and some of plastic. Most composite wood decking is created when wood is added to plastic resin (usually polyethylene). Since the properties of composite decking vary from manufacturer to manufacturer, marketers will differentiate their products using various metrics or features, most notably:

• The source of their plastics (“post-consumer” is considered greener),
• The percent of recycled plastic (for those who want to use recycled products),
• The percent of virgin plastic (for those who don’t want to use recycled plastics because of perceived quality issues),
• The source of the non-plastic components used (recovered wood is the greenest alternative),
• The quality of the post-consumer resin used in the plastic (you don’t want chopped-up milk and vitamin labels in the deck boards),
• The color-fast properties of the decking (fading is so common among some it’s sometimes called a “mellowing process”),
• The surface feel and slip-resistance,
• The structural performance of the product (look for 16 o-c span-ability),
• The UV-protection the decking (anything to frustrate the sun’s punishing rays), and
• The deck board’s weight per board food (for transportation, easy handling during installation, and span loading).

 For a good composite example, let’s look at a popular product and see how it presents itself in these categories. Latitudes composite wood decking is made with both recycled and virgin polyethylene, and 100% of the wood additive is reclaimed product. Indeed, Latitudes is made from approximately 70% recycled materials. It’s “barefoot friendly,” slip-resistant, and reversible with a brushed finish on one side, and a wood grain look on the other, so you can choose look-and-feel. Latitudes comes in six colors—gray, cedar, redwood and walnut, and the specialty colors of Koa and Adobe in the tropical wood-look Latitudes Capricorn composite decking.

No matter what composite deck boards you're looking for, be sure they can span 16-o.c. joists, and that they comply with the all the crucial codes and standards. Look for a warranty of at least 10 years, and it should cover splintering, corrosion, as well as rot, warp, cupping, checks, or damage caused by termites or fungal decay. And finally, urge your customers to purchase premium products, for their own sake. If they always use low cost as the ultimate metric of value, they risk their reputations, as well as the prospect for annoying callbacks that are hard to solve without painful and costly tear-outs.

Your mid-summer outdoor pursuits may find you wandering pressure treated docks, boardwalks and nature path bridges. The posts supporting these structures are often sunk in water. Speculation regarding exposing aquatic wildlife to the chemicals used to treat the wood has led in some cases to concerns about the use of pressure treated wood in these applications.

In a recently published article, Dr. Kenneth Brooks, of Aquatic Environmental Sciences, presented his conclusions regarding this concern after studying the environmental response to pressure treated lumber over the last 17 years. As Dr. Brooks states in the article, “In 14 of 15 risk assessments, no significant adverse affects to the environment were documented. In fact, invertebrate communities were more diverse and abundant near these (pressure treated lumber) structures than at nearby reference locations.”

The newest, most technologically advanced pressure treatment formula—such as that used in ProWood Micro CA—is micronized copper azole. According to testing performed by Scientific Certification Systems, this new formulation has achieved a 90-99% reduction in copper release in aquatic and terrestrial environments. In addition, the copper in ProWood Micro CA bonds readily to organic matter in the soil. The copper becomes biologically inactive, thus causing no ecological impacts.

Continuous improvement through better technology is helping pressure treated lumber become an even more sustainable product, with no decline in performance.

If you're thinking about having a new dock built or are about to replace an existing dock, then consider two popular types of decking material—natural lumber decking and composite lumber decking. Each type of dock / deck building material has it's own unique benefits, and each has passed the test of time in unforgiving elements.

Natural Lumber Decking

Pressure-treated wood decking is a great option for a tighter budget. The classic look of wood gives a more rustic feel, and can be stained or painted to match virtually any color scheme. Pressure-treated decking can be notched for installation of hidden deck fasteners for a clean, fastener-free appearance.

Tropical hardwood has a highly desired exotic look and is very durable. Hardwood species like Ipe have been known to last over twenty years. Tropical decking like Abaco can span greater distances to accommodate wide 24" on center joist spacing. Some hardwood decking comes pre-grooved for use with a hidden fastener system.

Composite Lumber Decking

Composite decking is manufactured from wood fiber and plastic to form a plank that requires less maintenance and typically has a longer lifespan than natural wood decking. Composite lumber is similar in cost to tropical hardwood and has many of the same benefits. Like tropical hardwood, Latitudes Marine composite decking allows for long 24" on-center joist spans. Latitudes Marine also incorporates a profiled edge specifically designed for docks, boardwalks and walkways. Additional benefits of composite lumber decking is that it's barefoot friendly, slip-resistant and comes in a variety of colors that never need to be sealed or stained.