Building Products, Lumber Yards Industry Terminology

ACQ (Alkaline Copper Quaternary)

A waterborne copper-based wood preservative widely used in residential treated lumber as a replacement for CCA; retention requirements vary by AWPA use category. It is more corrosive to uncoated steel, so fasteners and connectors must be hot-dip galvanized or stainless.

- Stock 4x4 ground-contact posts treated to ACQ UC4A. - Specify ACQ-compatible joist hangers for the deck package. - Customer asks difference between ACQ and CCA for a seawall.

ADA Compliance

Meeting Americans with Disabilities Act accessibility requirements for products and installations, such as clearances, slopes, reach ranges, and grab bar placements.

- Supply ADA-compliant handrails and fasteners for a public stair. - Verify door hardware meets ADA lever and force requirements. - Quote restroom partitions with ADA grab bars per spec.

Air-Dried Lumber (AD)

Lumber dried by ambient air to a typical 12–19% moisture content; slower than kiln-drying and can yield a more relaxed board but with more variability and risk of movement.

- Order AD walnut slabs for custom millwork. - Advise customer to acclimate AD boards before fabrication. - Compare pricing of AD vs KD cypress.

Architectural Specification (Spec)

The written portion of project documents describing acceptable products, performance criteria, and submittal requirements; governs approvals and substitutions on commercial and residential projects.

- Submit a substitution request for an alternate WRB per Spec 07 25 00. - The spec lists APA Rated Sheathing, Exposure 1, 7/16 inch OSB. - Basis-of-design calls for glulam beams with ESR report.

AWPA (American Wood Protection Association)

Standards body for wood protection; defines preservative types, retentions, and use categories (UC1–UC5) that appear on treated wood stamps and specifications.

- Treated lumber stamped AWPA UC3B for exterior above ground. - Verify AWPA retention for UC4B posts in ground contact. - Educate crew on AWPA label changes.

B2B eCommerce

An online ordering and account-management platform for professional customers, integrating contract pricing, quotes, job lists, and ERP systems.

- Contractor builds a materials list and checks branch inventory online. - Enable punchout catalog for a large GC procurement system. - Push price files and availability via API to a builder app.

Backorder

An unfilled demand for an item not currently in stock; managed via ETAs, partial shipments, and substitutions.

- Notify customer that 5 squares of shingles are on backorder until Friday. - Offer an alternate species to cover a backordered moulding profile. - Split the PO to ship in-stock items now and backorder the rest.

BIM (Building Information Modeling)

Digital 3D modeling with embedded data for building components to support coordination, clash detection, and estimating.

- Provide Revit families for LVL beams and hangers. - Use BIM takeoffs to validate the truss package quantities. - Coordinate wall sheathing nailing zones in the BIM model.

Board Foot (BF)

A volume unit for lumber equal to 1 in. x 12 in. x 12 in.; formula: BF = thickness (in) x width (in) x length (ft) / 12. Used extensively for hardwood purchasing and pricing.

- Price maple at 4.50 per board foot. - Calculate BF for 8/4 stock before quoting. - Convert a cut list into total board feet for purchasing.

Bow, Cup, Twist (Warp)

Common distortions in lumber from drying or internal stresses: bow (lengthwise), cup (across width), and twist (helical).

- Inspect incoming studs for twist beyond stud grade limits. - Advise storage practices to minimize cup in wide boards. - Sort out bowed deck boards for returns.

CCA (Chromated Copper Arsenate)

A legacy preservative treatment largely restricted from residential use; still specified for industrial, marine, and utility applications.

- Quote CCA-treated timbers for a dock per spec. - Explain why CCA is not stocked for residential decks. - Source CCA piles with required retention for brackish water.

Chain-of-Custody (CoC) Certification

Traceability systems (e.g., FSC, PEFC) ensuring certified wood is tracked from forest to finished product, allowing verified sustainability claims.

- Maintain CoC certificates to sell FSC Mix framing. - Include CoC transaction codes on invoices for audits. - Segregate certified inventory in the yard.

CLT (Cross-Laminated Timber)

Mass timber panels constructed of lumber layers glued at right angles for strength and stability, used for floors, walls, and roofs.

- Confirm CLT panel layup and grade for a floor diaphragm. - Discuss CLT lead times and crane logistics with the GC. - Coordinate shop drawings for CLT openings.

COGS (Cost of Goods Sold)

Direct costs of products sold, including purchase price, inbound freight, and handling, used to calculate gross margin and profitability.

- Review COGS to ensure fuel surcharges are captured. - Margin on that LVL bundle is ASP minus COGS. - Use weighted average cost for COGS in the ERP.

Credit Terms (e.g., 2/10 Net 30)

Payment conditions extended to customers that define due dates and early-pay discounts, influencing cash flow and pricing strategy.

- Offer 2/10, Net 30 to a new pro account. - Finance calls on an overdue Net 30 invoice. - Price break assumes standard Net 30 terms.

Dimensional Lumber

Standard softwood lumber sizes (e.g., 2x4, 2x6) identified by nominal dimensions that differ from actual surfaced sizes; graded for structural use.

- Clarify that a 2x4 actual size is 1.5 by 3.5 inches. - Quote SPF No. 2 dimensional lumber for framing. - Stock list separates studs from random-length dimension.

Distribution Center (DC)

A regional facility that consolidates, stores, and ships inventory to branches or jobsites, often with cross-docking and replenishment operations.

- Shift slow movers to the DC to free branch space. - Improve OTIF from the DC with better slotting. - Stage mixed-unit loads at the DC for early drops.

Dressed Lumber (S4S)

Lumber surfaced on four sides for uniform thickness and width; related terms include S2S (surfaced two sides) and SLR1E (straight-line ripped one edge).

- Order S4S poplar for paint-grade millwork. - Specify SLR1E to minimize shop prep time. - Price difference between rough and dressed oak.

Drop-Ship

A fulfillment method where the vendor ships directly to the customer or jobsite on behalf of the dealer, reducing handling and lead time.

- Arrange a roof truss drop-ship to Lot 12 on Tuesday. - Use drop-ship for custom windows to meet the schedule. - Vendor will drop-ship the FRT plywood pallet.

Dunnage

Material used to protect, separate, and support loads during storage and transport; also used to elevate units above ground moisture.

- Place dunnage under units to keep them off wet ground. - Add corner protectors and dunnage for flatbed shipments. - Dispose of treated dunnage per yard policy.

EDI (Electronic Data Interchange)

Structured, system-to-system exchange of business documents like purchase orders, acknowledgments, advance ship notices, and invoices.

- Send 850 purchase orders and receive 855 confirms via EDI. - The mill transmitted an 856 ASN with pallet tags. - Switch key vendors to EDI to cut order entry errors.

End-Matched (EM) Tongue-and-Groove

Boards machined with tongue-and-groove on both edges and ends, allowing butt joints between supports and reducing waste in installation.

- Specify EM pine for the porch ceiling. - Installer can start mid-span thanks to end-matching. - Verify EM profile matches the existing floor.

Engineered Wood Products (EWP)

Manufactured wood members such as LVL, PSL, LSL, I-joists, and glulam that deliver predictable performance, longer spans, and efficient material use.

- Size LVL headers with the supplier's software. - Stock I-joists with matching rim board and hangers. - Replace 4x10s with EWP to control shrinkage.

EPR (Extended Producer Responsibility)

Policies assigning producers responsibility for end-of-life management of products or packaging, affecting labeling, fees, and recycling compliance.

- Register for state EPR packaging fees. - Shift to recyclable stretch wrap to reduce EPR costs. - Add eco-fee lines on invoices where required.

Exposure Rating

APA/PS durability designation on wood structural panels: Exposure 1 for temporary moisture exposure and Exterior for permanent exposure.

- Use Exposure 1 OSB for roof sheathing. - Spec calls for Exterior plywood for a soffit. - Read the panel stamp for exposure rating and span.

FAS (Firsts and Seconds)

The highest NHLA hardwood grade, providing high clear-face yield suitable for premium millwork and furniture.

- Quote FAS cherry for stain-grade cabinetry. - Offer 1 Common as a value option to FAS. - Verify tally includes only FAS boards.

Fill Rate

The percentage of demand fulfilled from available stock without backorders; measured at order, line, or item level.

- Branch improved line fill rate from 88% to 95%. - Expedite studs to protect order fill on Friday loads. - Use safety stock on fast movers to raise fill rate.

FOB (Free On Board)

A shipping term indicating when title and risk transfer and who pays freight; commonly FOB Origin or FOB Destination in domestic trade.

- Price is FOB mill, freight collects. - FOB destination means the vendor owns the load until delivery. - Clarify FOB terms on the purchase order.

FRT (Fire-Retardant-Treated) Wood

Lumber or plywood treated to reduce flame spread and smoke development, typically with specific code listings and installation requirements.

- Supply FRT plywood for multifamily exterior walls. - Confirm allowable spans per the FRT manufacturer's ESR. - Store FRT under cover to protect treatment.

FSC Certification (Forest Stewardship Council)

Independent certification of responsible forestry; products may be labeled FSC 100%, FSC Mix, or FSC Recycled with chain-of-custody control.

- Provide FSC Mix credit on the invoice for LEED. - Keep FSC chain-of-custody records for audits. - Source FSC-certified cedar for a public project.

Glulam (Glued Laminated Timber)

Structural beams built from bonded laminations, available in straight or curved forms, offering high strength and aesthetic options.

- Quote 5-1/8 x 18 glulam for the great room ridge. - Choose architectural appearance grade for exposed beams. - Coordinate camber and bearing details with the framer.

GMROI (Gross Margin Return on Inventory Investment)

A profitability metric: gross margin dollars divided by average inventory cost; indicates how efficiently inventory generates profit.

- Shift SKUs to raise GMROI in fasteners. - Vendor-managed inventory improved GMROI by 20%. - Compare GMROI of decking brands before resets.

Grade Stamp

Marking on lumber or panels indicating species, grade, mill ID, moisture condition, span/exposure ratings, and grading agency for code compliance.

- Inspect studs for SPF, S-Dry, Stud, NLGA stamp. - Panel shows 24/16 span rating and Exposure 1. - Reject units missing an approved grade stamp.

Green Lumber (S-GRN)

Freshly sawn lumber with high moisture content that will shrink and move as it dries; often stamped S-GRN.

- Order S-GRN 2x10s for quick framing but warn about shrinkage. - Allow extra time for green timbers to season. - Price difference between green and KD SYP.

Gypsum Board (Drywall)

Paper-faced gypsum panels for interior walls and ceilings; available in standard, moisture-resistant, and fire-rated (Type X) versions.

- Load 5/8 inch Type X for the garage ceiling. - Include joint tape and setting compound with gypsum order. - Check lead times on 54 inch wide boards for tall walls.

H-Clip (Sheathing Spacer)

A small metal clip inserted between roof sheathing panels at unsupported edges to maintain spacing and improve edge support.

- Add H-clips for 7/16 inch OSB on 24 inch centers. - Inspector flagged missing H-clips on the roof deck. - Include correct number of H-clips per square.

Hardwood vs Softwood

Botanical categories: hardwoods from deciduous species (e.g., oak, maple) typically for millwork, and softwoods from conifers (e.g., SPF, SYP) for structural framing.

- Recommend softwood SPF studs, hardwood poplar for trim. - Explain why hardwood is sold in board feet and thickness quarters. - Separate hardwood racking from framing lumber.

HDO (High-Density Overlay) Plywood

Plywood with a resin-impregnated fiber overlay that creates a smooth, durable surface, commonly used for concrete forming and signage.

- Supply HDO forms for an architectural finish. - Compare HDO to MDO for number of reuses. - Store HDO flat to avoid surface damage.

Hurricane Tie

A metal connector that secures rafters or trusses to wall plates, improving uplift and lateral resistance per code.

- Add hurricane ties to the takeoff for the coastal job. - Verify nail schedule for each hurricane tie model. - Stock stainless ties for salt-air environments.

Hygroscopicity

The tendency of wood to absorb or release moisture from the air, changing dimensions until reaching equilibrium moisture content with surroundings.

- Instruct customers to acclimate flooring to site EMC. - Expect seasonal movement in wide plank tops. - Avoid sealing only one face to reduce cupping.

ICC-ES Report (ESR)

An evaluation report from ICC Evaluation Service that verifies product compliance with building codes, often required for approval by inspectors.

- Provide ESR number for FRT plywood to the inspector. - Truss hangers must have an active ESR or UL listing. - Submittal includes ICC-ES reports for WRB and sealant.

I-Joist

An engineered joist with flange members and an OSB or plywood web, offering high strength-to-weight and long-span capabilities.

- Use I-joists at 16 inch o.c. for a 20 foot span. - Match hangers to the I-joist series and flange width. - Provide squash blocks under bearing walls.

Incoterms

International commercial terms (e.g., EXW, FOB, CIF, DDP) that define delivery obligations, cost allocation, and risk transfer between buyer and seller.

- Import SPF on CIF terms to cover ocean freight and insurance. - Clarify DDP when quoting delivered price including duties. - Supplier proposes FCA mill for containerized plywood.

Intumescent Coating

A fire-protective paint that swells to form an insulating char when heated, helping substrates like wood or steel meet fire-resistance requirements.

- Specify intumescent coating on exposed glulam per design. - Verify wet film thickness to meet the rating. - Use tested coating system per the ESR.

Inventory Turns

A measure of how many times inventory is sold and replaced during a period; typically COGS divided by average inventory cost.

- Set targets of 8 turns for fasteners, 4 for plywood. - Reduce dead stock to improve turns and cash. - Seasonal decking buy-down planned to maintain turns.

J-Channel (Siding Trim)

J-shaped trim used with vinyl or metal siding to receive and finish panel edges around openings and transitions.

- Include white J-channel for all window perimeters. - Order longer J-channel lengths to reduce waste. - Teach installers to leave weep paths in J-channel.

Janka Hardness

A measure of a wood species' resistance to denting and wear determined by the force required to embed a steel ball; guides flooring and millwork choices.

- Compare Janka of red oak vs hickory for flooring choice. - Customer asks for a high Janka species for a shop floor. - Explain denting risk of soft species despite finish.

JIT (Just-in-Time)

An inventory strategy that times deliveries to actual need to reduce carrying costs, with higher exposure to supply variability risk.

- Schedule daily stud deliveries to the panel plant JIT. - JIT failed during rail delays; raise safety stock. - Use VMI and JIT together for high-volume SKUs.

Joint Compound

Gypsum-based material used to embed tape, fill joints, and finish gypsum board; available in ready-mix and setting-type formulations.

- Add 45-minute setting compound for patch work. - Stock all-purpose mud and lightweight topping. - Include mesh tape and knives with joint compound.

Joist Hanger

A metal connector that supports joists or trusses at headers or ledgers; selection depends on load, geometry, and fastener schedule.

- Use a top-flange hanger where side access is blocked. - Confirm hanger capacity with specified nails, not screws. - Order sloped and skewed hangers for the hip rafters.