Lumber, Engineered Wood, Fasteners & Hardware

Welcome

Hello, and welcome. This is Super Structures General Contractors — a national general contractor headquartered in Powhatan, Virginia — here to help you and your clients build something that lasts. We're glad you're with us, and we look forward to connecting with you.

Here's one that matters more than its name lets on — Lumber, Engineered Wood, Fasteners & Hardware. If you remember one thing, make it this: Every stick, nail, and connector in a frame is specified for a reason — species and grade, moisture content, engineered product, fastener size and coating — and substituting by eye is how framing fails inspection or fails later. Do this right and the material on the truck matches the material on the plan.

Dimensional lumber

Lumber is sold by nominal size and milled smaller: a 2x4 is 1-1/2 by 3-1/2 inches, a 2x10 is 1-1/2 by 9-1/4. Framing lumber comes in species groups — Spruce-Pine-Fir (SPF), Hem-Fir, Douglas Fir-Larch, and Southern Pine — and in grades: Select Structural, No. 1, No. 2, No. 3, Stud, and the Construction/Standard/Utility light-framing grades.

Every piece carries a grade stamp from an agency accredited by the American Lumber Standard Committee showing species, grade, mill, and moisture designation — S-GRN (surfaced green, over 19 percent moisture) or S-DRY/KD-19 (19 percent or less). Learn to read it, and to spot crown, wane, large knots, checks, and shake.

Treated lumber

Sill plates on concrete and members in contact with the ground or exposed to weather must be preservative-treated or naturally durable (IRC R317), and treated lumber is sold by AWPA Use Category (above-ground and ground-contact are different products). Copper-based treatments corrode ordinary steel, so fasteners and connectors in treated wood must be hot-dip galvanized or stainless steel per the code and the connector manufacturer.

Engineered wood

• LVL, PSL, LSL, and glulam beams and headers — sized from the manufacturer's tables or by the engineer.
• I-joists — light and long-spanning, with strict rules: never cut or notch a flange, and follow the manufacturer's hole chart for the web.
• Metal-plate-connected trusses — designed under ANSI/TPI 1; never cut or modify one without the truss designer's repair detail.
• Sheet goods — plywood and OSB rated by APA with a span rating (32/16 means 32 inches between roof supports, 16 between floor supports); tongue-and-groove 23/32 panels are the common subfloor.

Nails and screws

Nails are named by penny size (d), but the code's fastening schedules list length and shank diameter: a 16d common is 3-1/2 inches by 0.162, a 10d common 3 by 0.148, an 8d common 2-1/2 by 0.131. Many gun nails sold as "16d" are thinner than a 16d common, so match the gun nail to the schedule, not the name. Drywall and deck screws are not structural fasteners; structural screws with an ICC-ES evaluation report are.

Connectors and hardware

Joist hangers, hurricane ties, straps, hold-downs, post bases, and anchor bolts form the continuous load path, and each has a rated capacity that assumes every hole is filled with the specified fastener. IRC R403.1.6 requires 1/2-inch anchor bolts in sill plates at no more than 6 feet on center, at least two per plate section, and within 12 inches of each end.

Going Deeper (Intermediate)

Wood shrinks across the grain as it dries and barely along it. A house framed with green lumber shrinks as it heats and dries, which shows up as drywall cracks, nail pops, and squeaks. Keep lumber stacked flat, off the ground, and covered, and set joists and rafters crown up.

Advanced / Pro-Level

Pros think in design values: the American Wood Council's National Design Specification for Wood Construction (NDS) assigns strength and stiffness values by species and grade, which is why Southern Pine No. 2 and SPF No. 2 do not span the same distance. In high-wind regions they follow the AWC Wood Frame Construction Manual for uplift connections from roof to foundation. They standardize gun nails so one shank size meets the schedule everywhere, keep the connector catalog and ICC-ES reports on site, and require submittals for every engineered product.

Practice Challenge

A framer is nailing joist hangers with the 0.131 by 2-1/2-inch gun nails already on his belt from sheathing, in a treated-lumber deck frame. What's wrong? (Answer: the hanger is rated only with the manufacturer's specified fastener — typically 10d or 16d common diameter or its listed connector nails — and undersized nails cut its capacity; in treated lumber they must also be hot-dip galvanized or stainless.)

In Practice

A crew that checks the grade stamp, the hanger nails, and the anchor bolt layout before the inspector arrives gets a signature. A crew that frames with whatever the yard sent spends Friday pulling No. 3 studs out of a bearing wall.

Common Mistakes to Avoid

• Using the wrong species or grade for the span table the plan was based on
• Uncoated fasteners or aluminum in contact with treated lumber
• Hangers with empty holes or undersized nails
• Cutting or notching I-joists and trusses without the manufacturer's detail

Takeaway: Every stick, nail, and connector in a frame is specified for a reason — species and grade, moisture content, engineered product, fastener size and coating — and substituting by eye is how framing fails inspection or fails later.

Educational overview only — not hands-on carpentry instruction, structural design, a safety program, or a substitute for training under an experienced carpenter. Follow OSHA 29 CFR 1926, the IRC or IBC as adopted and amended in your jurisdiction, the approved plans and manufacturer instructions, and your state's contractor licensing rules.