Lumber Selection Basics

What should I look for in a board?

Sight down each board to check for bowing, twisting and cupping. Look for large knots, cracks, splits and signs of rot or insect damage. Pick boards by hand where the yard allows, rather than accepting a whole bundle sight unseen.

Straight, flat boards make building easier and joints tighter. A warped board can often be cut into shorter pieces, but check before you buy.

Bring a short list with the lengths and counts you need and a tape measure to the yard. Staff can often help you find the best boards in a stack and may let you pick, particularly if you are polite and make a clear plan.

What do grades and species mean?

Grades describe how many defects a board has and what it is good for. Species differ in strength, rot resistance and cost. Local yards stock what grows or sells in your region, and staff can explain what suits framing, fencing or finish work.

For structural uses, follow the plan or local code. Ask your building office or a qualified builder which grade and species are acceptable for the load.

Nominal and actual sizes differ, so a board sold under one name will measure smaller than the name suggests. Check the real dimensions before drawing plans or cutting, and ask the yard staff how their sizes work.

Treated or untreated wood?

Pressure-treated wood resists rot and insects and is common for posts, sills and anything touching soil. It requires suitable fasteners, and cut ends may need to be treated as the maker directs. Wear gloves and a dust mask when cutting it, and never burn treated scraps.

Untreated wood is better near food and animals where chewing or contact is a concern, but it will rot faster in the ground. Ask your extension office what is advised for garden beds, livestock and poultry areas.

Ask your supplier or extension office what treatment level suits ground contact, and what needs a higher level. Treated products come with labels that explain their intended uses, and following the label is part of using them correctly.

• Treated for ground contact and structural posts where appropriate
• Untreated or naturally durable for raised beds and animal contact
• Use fasteners rated for the lumber type
• Do not burn treated scraps

How does moisture affect lumber?

Wood moves as it dries. Green or wet boards shrink, twist and open gaps as they season, while dry lumber is steadier. Let lumber acclimate near the build site for a time if you can, stacked flat with spacers for airflow.

Keep lumber off the ground and covered but ventilated. Wet storage invites mold and warping.

Stack with narrow strips between boards, called stickers, so air moves through the pile and the boards dry evenly. Store them flat on a level base, covered on top and open at the sides.

What about rough-sawn and local lumber?

A local sawmill can supply rough-cut boards and posts, sometimes at lower cost, and may cut custom sizes. Rough lumber is often full dimension and may be green. Ask the miller about species, drying and size so you can plan.

State forestry offices and extension services can often point you to local sawyers and explain local species and their uses.

Ask a local sawyer about wood that is available in your region. Some species resist rot well and cost less because they grow nearby, and local knowledge can save money and improve results.

How do I estimate and budget?

List every piece with length and count, add extra for waste and mistakes, and ask the yard how they price by piece or length. Cost categories include the lumber, fasteners, delivery, tools you lack and finish or sealant.

Prices change over time and between suppliers, so get current quotes instead of relying on old figures.

If you are buying for a larger project, ask whether the yard will hold the order and deliver it, and inspect the delivery before the driver leaves. Send back boards that are badly warped or damaged while it is still easy to do so.

What mistakes should I avoid?

Do not buy the cheapest boards for structural parts, ignore moisture, or use treated wood in places where chewing animals or edible crops make it unsuitable. Do not skip checking boards in person when you can.

When in doubt about safety or code, ask a qualified builder before buying.

Think about how the finished project will be used. A bench, a gate and a coop each face different stresses, and the best lumber for one may be a waste of money for another.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.