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newSchoolWorks.com › VoTechWorks › Building & Construction › Construction (general) › Framing: Wood and Metal Stud Construction › Lesson 7
BLD-CONS02-06 · Lesson 7 · 8 clock hours · demo

Engineered Wood Products, Sheathing, and Framing Inspection

Objective. Students identify common engineered wood products used in framing, specify correct installation orientation, and complete a mock AHJ (Authority Having Jurisdiction) framing inspection checklist on a partially framed structure.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed professional engineer or master tradesperson or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

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What Are Engineered Wood Products?

Engineered wood products (EWPs) are manufactured from wood fibers, veneers, or strands bonded with adhesives under heat and pressure. Unlike dimensional lumber, EWPs are designed to precise engineering standards, which means they carry predictable load ratings and must be installed exactly as the manufacturer specifies. The three products you will work with most in residential and light commercial framing are laminated veneer lumber (LVL), I-joists, and glulam beams.

Laminated Veneer Lumber (LVL)

LVL is made by bonding thin wood veneers together with all grain running parallel to the length of the member. This makes LVL much stronger and stiffer than sawn lumber of the same size, and far more consistent. LVL is commonly used for headers over doors and windows, ridge beams, hip and valley members, and carrying beams.

Installation requirements: LVL must be installed with the laminations vertical — never flat unless the engineer has specifically detailed it that way. Bearing length (the amount of LVL sitting on a support) must meet the manufacturer's minimum, typically 1.5 inches at interior supports and 3.5 inches at end supports, but always confirm with the product's technical guide. LVL is not field-notchable. Any notch, hole, or cut not shown in the approved plan voids the engineered rating.

I-Joists

An I-joist has a top flange, a bottom flange, and an OSB or plywood web connecting them. The flanges carry bending stress; the web resists shear. Because each zone does a specific job, you must protect each zone.

Prohibited notching zones: Never notch either flange anywhere along the joist. Web holes are permitted only in the middle third of the span, within round knockouts already provided, or within dimensions listed in the manufacturer's hole chart — holes outside those limits require engineering approval.

Web stiffeners: At bearing points (walls, beams, and hangers) vertical blocks of wood called web stiffeners are nailed to both sides of the web. They prevent the web from rolling or crushing under point loads. Install them tight against the flange and flush with the bearing surface.

Blocking and rim board: At the ends of an I-joist floor system, a rim board — typically LVL or a product rated for that use — closes the floor system and transfers loads. Solid blocking between joists is required at supports and wherever specified in the design to restrain the top flange from rotating laterally.

Top-chord flush: When setting I-joists in joist hangers or on a beam, the top face (top chord) of every joist must be flush or within the manufacturer's tolerance so the subfloor lies flat. Use a string line or straightedge to check alignment before fastening.

Glulam Beams

Glulam (glued laminated timber) beams are built from horizontal layers of dimension lumber bonded together. They are used for long spans and large loads. Glulams are stamped with a combination symbol (for example, 24F-V4) that specifies bending stress and lay-up. The top of a glulam is marked; install it with the correct face up as stamped. Camber (a slight upward bow) is intentional — the beam deflects to near level under load.

Sheathing Orientation and APA Ratings

Structural sheathing — whether plywood or OSB — has a face grain direction (plywood) or a strength axis (OSB). Panels must be installed with the strength axis perpendicular to framing members (across the joists or studs) unless the layout specifies otherwise. Panel edges must be staggered (offset) between rows. APA-rated sheathing carries a stamp that tells you span rating, exposure rating, and thickness. Match the stamp to the job specification.

The AHJ Framing Inspection

Before insulation or drywall is installed, the Authority Having Jurisdiction (the local building department) sends an inspector to verify that framing meets the approved plans and adopted building code. Failing this inspection means you stop work until deficiencies are corrected. Smart framing crews do their own pre-inspection walk before calling for the official one.

A typical framing inspection checklist covers:

Document every item as PASS or FAIL. For every FAIL, write the corrective action required — be specific (for example: "Install web stiffener both sides, nail per manufacturer schedule").

Safety on the Framing Deck

Wear your hard hat, safety glasses, and work boots with ankle support at all times on the deck. Keep the floor clear of off-cuts before walking on I-joists — a tripping hazard on an open floor system is a fall hazard. When using a framing nailer, keep your free hand clear of the muzzle, confirm the safety tip is depressed against the workpiece before firing, and engage the tool's safety when carrying it. Never use a nailer overhead without being certain of what is on the other side of the member. Construction adhesive tubes are under pressure; point the nozzle away from your face when cutting the tip.

When lifting LVL or glulam sections, use team lifts — these members are heavy and awkward. Keep your back straight and lift with your legs.

Key terms9

Laminated Veneer Lumber (LVL)An engineered wood product made from wood veneers bonded with parallel grain; used for headers, beams, and ridge members where consistent strength and stiffness are required.
I-joistA manufactured floor or roof framing member with top and bottom flanges connected by an OSB or plywood web; engineered to carry bending and shear loads without the natural defects found in sawn lumber.
Glulam (Glued Laminated Timber)A structural beam made from horizontal layers of dimension lumber glued together; used for long spans and carries a grade stamp indicating bending stress class and lay-up.
Web StiffenerA vertical wood block nailed to both sides of an I-joist web at bearing points to prevent web crushing or buckling under concentrated loads.
Bearing LengthThe minimum distance an engineered wood member must rest on its support; specified by the manufacturer and critical to safe load transfer.
AHJ (Authority Having Jurisdiction)The organization, office, or individual — typically the local building department — responsible for enforcing the adopted building code and approving construction inspections.
Fire BlockingSolid framing material installed in concealed wall or floor cavities to slow the spread of fire and hot gases through concealed spaces.
Nailing ScheduleA table on the structural drawings or in the building code that specifies the required nail size, type, and quantity for each structural connection in the framing system.
APA-Rated SheathingStructural plywood or OSB panels certified by APA – The Engineered Wood Association, carrying a stamp that identifies span rating, exposure durability, and thickness.

Worked examples4

1. An LVL header spans 6 feet between two jack studs. The manufacturer's technical guide requires a minimum bearing length of 1.5 inches at each end. How much total bearing length must be provided across both supports?
  1. Identify the minimum bearing length at each support: 1.5 inches.
  2. Multiply by the number of supports: 1.5 in × 2 supports = 3.0 inches total minimum bearing.
Answer: 3.0 inches of total bearing length must be provided (1.5 inches at each end support).
2. You are installing I-joists that are 16 feet long. The manufacturer's hole chart allows circular holes only in the middle third of the span. What is the length of the permitted hole zone, and where does it start and end measured from each end?
  1. Calculate the middle third: 16 ft ÷ 3 = 5.33 ft per third.
  2. The permitted hole zone starts at 5.33 ft from one end and ends at 5.33 ft from the other end.
  3. Length of the permitted zone: 16 ft − (5.33 ft + 5.33 ft) = 5.34 ft (approximately 5 ft 4 in).
  4. State the boundaries clearly: holes allowed from 5 ft 4 in to 10 ft 8 in from either end (i.e., the center 5 ft 4 in of the 16-ft joist).
Answer: The permitted hole zone is approximately 5 feet 4 inches long, located from 5 feet 4 inches to 10 feet 8 inches measured from either end of the joist.
3. During your pre-inspection walk you find that anchor bolts are spaced 8 feet apart along a sill plate. Your approved plans call for a maximum spacing of 6 feet on center. How many additional anchor bolts are needed along a 24-foot sill plate run to meet the 6-foot maximum spacing requirement?
  1. Determine how many anchor bolt spaces fit in 24 feet at 6 ft o.c.: 24 ÷ 6 = 4 spaces.
  2. Number of bolts required at 6 ft o.c. for 24 ft: 4 spaces + 1 end bolt = 5 bolts (assuming one bolt at each end of the run).
  3. Number of bolts currently installed at 8 ft o.c.: 24 ÷ 8 = 3 spaces + 1 = 4 bolts.
  4. Additional bolts needed: 5 − 4 = 1 additional anchor bolt.
Answer: 1 additional anchor bolt is needed to reduce spacing from 8 feet to 6 feet on center along the 24-foot sill plate.
4. A floor deck uses APA-rated sheathing panels that are 4 feet wide. The panels must be staggered so that end joints in adjacent rows are offset by at least 2 feet. If the first row begins with a full 8-foot-long panel, what length starter panel should begin the second row to achieve the minimum 2-foot offset at the first end joint?
  1. The first row starts at 0 ft; its first end joint is at 8 ft.
  2. For a 2-foot minimum offset, the second row's first end joint must be at 8 ft − 2 ft = 6 ft, or 8 ft + 2 ft = 10 ft from the start.
  3. Using the shorter option (6 ft) to minimize waste: the second row begins with a panel 6 feet long.
  4. Confirm offset: 8 ft − 6 ft = 2 ft — meets the minimum requirement.
Answer: Start the second row with a 6-foot-long panel to achieve a 2-foot end-joint offset from the first row.
In class: Instructor demonstrates LVL (Laminated Veneer Lumber), I-joist, and glulam beam installation requirements, including bearing length, web stiffeners, and prohibited notching zones; students annotate cross-section diagrams in their lab logs. · Students install a short run of I-joists on a mock floor section: align top-chord flush, install blocking at supports, and attach rim board — confirming no field notching of webs. · Using an instructor-prepared framing inspection checklist (modeled on typical AHJ items: stud spacing, header sizing, anchor bolt spacing, hold-down hardware, nailing schedule compliance, fire blocking locations), students inspect the partially framed lab structure in pairs and document every finding with a pass/fail notation and corrective action.
Materials: I-joist samples and LVL sections (off-cuts), glulam cross-section diagram, web stiffener stock, construction adhesive, framing nailer, APA I-Joist installation guide, AHJ-style framing inspection checklist (instructor-prepared), lab log, pencil
Check: Students submit completed inspection checklist; instructor compares to master list — pass = identifies at least 90% of planted deficiencies and recommends correct action for each.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

NCCER Construction Technology — Framing
1. An I-joist web stiffener is required primarily to:
NCCER Construction Technology — Engineered Wood Products
2. Which of the following actions is NEVER permitted on a laminated veneer lumber (LVL) header?
NCCER Construction Technology — Framing
3. Where along an I-joist span are round utility holes generally permitted by manufacturer guidelines?
NCCER Construction Technology — Sheathing
4. When installing APA-rated structural sheathing panels on a floor system, the panels must be oriented so that:
NCCER Core — Safety and Building Code Fundamentals
5. During an AHJ framing inspection, fire blocking is inspected primarily to verify that it:
NCCER Construction Technology — Engineered Wood Products
6. A glulam beam is delivered to the job site with a visible upward bow in the middle. The crew should:
OSHA 10 — Construction Safety and Health
7. Which personal protective equipment is MOST critical when operating a pneumatic framing nailer on a floor deck?
NCCER Construction Technology — Framing Inspection
8. On a framing inspection checklist, a student marks anchor bolt spacing as FAIL. The most appropriate corrective action to document is:
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