What does WP on wood mean?

WWPA certification mark - This symbol indicates that lumber bearing this trademark has been graded under the supervision of Western Wood Products Association. Mill identification - The originating mill is identified by an assigned mill number or by the firm's name or brand.

What is WP wood?

Western Wood Products Association is the largest association of lumber manufacturers in the United States.

What do the letters on lumber mean?

"#1 Structural" = at least 75% clear wood; "#2 Structural" = at least 66% clear wood; "#3 Structural" ("stud" grade) = at least 50% clear wood; "Construction Grade" = at least 57% clear wood; "Standard Grade" = at least 43% clear wood; and.

What is the best grade of hardwood?

Grades are based on the amount of usable clear material in a board. The highest grade boards are FAS and Select, followed by #1 Common and #2 Common.

What do the labels on wood mean?

That's why every stick of lumber coming out of a sawmill is appraised by trained inspectors and given a grade stamp. This cryptic tattoo indicates that a piece of wood meets established standards for strength and stiffness, and it also offers useful information about the type of wood and how much moisture it contains.

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What stamp is on treated wood?

Treated lumber is clearly stamped as such. Look for stamps that indicate ground contact levels. If it's stamped L-P22, it contains arsenic, is designed for direct contact with the ground and is the most toxic variety. If it's stamped ​L-P2​, it's slightly less toxic and not designed for direct contact with the ground.

How can you tell if wood is treated?

To tell if the wood is treated, check tags, stamps, and markings of chemicals used. Smelling can also help you know if wood is treated. Treated lumber can smell oily, while untreated wood doesn't. Treated wood also has a green or brown hue from the treatment process.

What is 1st quality hardwood?

First-quality hardwood floors are chosen for their lack of imperfections, impeccable milling, and overall uniformity of design. Cabin grade flooring is considered the lowest of all the hardwood flooring grades and includes the pieces that did not make the cut to be a higher grade.

Which is harder white or red oak?

According to the Janka hardness scale, white oak's rating is 1360, while red oak has a 1290 hardness rating. The difference is small, and even if white oak is harder, red oak may still be a better option for its visual appeal.

What does KD mean in woodworking?

You'll get less movement with kiln-dried (KD) or surface-dry (S-DRY) lumber, which has a moisture content between 16 and 19 percent. (KD-HT means the wood was also heat treated to kill pests, a requirement for imported lumber.)

What does HT mean on wood?

Wood from certified manufacturers of heat-treated lumber are stamped with the letters “HT” along with other identifying marks and codes.

Why is lumber stamped?

The grade stamp is extremely important to building inspectors, as it is required by all building codes. The code is usually enforced at the county level, where a building permit is required before any construction can begin. The building can be rejected if the lumber is not grade stamped.

How do you tell a Douglas fir from pine lumber?

The soft wood between the grain lines shrinks and expands, making the wood cup or twist. Fir has little soft grain. Pine has much more soft grain. For stability and strength, fir is much less prone to warping or twisting, and much stronger than pine.

Why are the ends of lumber painted?

Sealing the end-grain with paint or wax equalizes board shrinkage and avoids splits. A well-designed lumber rack is the second secret to successful wood storage.

What are lumber grades?

Hardwood grading for lumber considers the size and number of pieces (or cuttings) which may be yielded during the creation of a hardwood product. The grading system is based, therefore, on the measurable percentage of clear wood that is defect-free for each of the grades.

Is oak better than maple?

Overall, white oak is the best choice for projects that call for water-resistant, decay resistant wood. Oak offers more options as far as grain pattern, and will provide a richer look when used as cabinetry or flooring. Maple is lighter, more affordable, and works well in contemporary spaces and for indoor projects.

Is red oak worth anything?

The most recent report shows red oak at a median price of $300 per 1,000 board feet, twice the value of the next most valuable species, other oaks, at $150 per 1,000 board feet.

How do you tell red oak from white oak?

White oak is darker and more brown-tan than red oak, while somewhat more rugged looking. Red oak is more of a wheat color, sometimes (and coincidentally) with a tinge of pink. Both take stains really well, thanks to their open grain, but not equally.

Are there different hardwood grades?

Each grade has its own particular characteristics and appearance. Especially pertaining to Oak hardwood flooring, the 3 most commonly used grades are: Select, #1 Common, and #2 Common, which is also known as “Rustic” grade, or “Builder's” grade.

What is the difference between red oak and white oak flooring?

Red Oak color is lighter than White Oak

The most significant difference between Red Oak and White Oak flooring is in their color. Surprisingly, White Oak tends to be a bit darker and has more beige and brownish hues, while Red Oak color has more salmon and pink undertones.

What is select red oak?

Select and Better– Select and better wood is milled from the sapwood. These bundles often include some clear pieces. There are essentially no knots or wormholes but there are some present. Graining appearance is strong and there is a slight color variation between the heartwood and sapwood.

What is difference between treated and untreated wood?

The difference between the two is that pressure treated lumber will resist the elements better than untreated due to chemical preservatives added, and so will maintain its integrity in conditions that would cause normal wood to rot.

Can you burn 20 year old pressure treated wood?

No. Do not burn a 20-year-old treated wood. Preservatives would be as toxic and could be even more. Until 2003, the most popular treated wood was CCA wood, which has a light green color and is laced with copper chrome and arsenic.

Why not use pressure treated wood indoors?

Never use recycled pressure treated lumber indoors. There's a good chance it was treated with CCA, which means it contains arsenic. If you're going to leave the pressure treated wood exposed, perhaps as a post or an exposed rafter, plan on painting or finishing it.