ACH 121 Lecture 07 (Wood) Part 2
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The document discusses various aspects of wood construction including lumber grades, structural members, panels, nails, and fasteners. It describes how lumber is graded based on strength, stiffness, and appearance. It also outlines different types of structural wood members like beams, joists, and engineered wood composites. Additionally, it covers wood panel standards and varieties of panels including plywood, OSB, and fiberboard. Finally, it discusses common wood fasteners such as nails, screws, bolts, and toothed plates.
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ACH 121 Lecture 07 (Wood) Part 2
- 1. WOOD CONSTRUCTION Lumber Grades Structural Members & Panels Nails & Fasteners Part 2 Professor Brandi R. Shepard© ACH 121-Materials and Methods 1
- 21. Laminated Wood
- 30. Structural Composite Lumber (LVL)
- 46. 16d Galvanized 16d Sinker Deformed Shank 10d Galv. Spiral Finish Nail Roofing Nail (far right)
Editor's Notes
- Thickness - “Nominal” < 2 inches - Boards FRAMING LUMBER - MOST 2 to 4 inches - Dimension Lumber = to or > 5 inches - Timbers Widths - “Nominal” Framing Lumber - 2, 4, 6, 8, 10, 12 inches WHY NOT Typically WIDER??? Finish /lumber - 1 inch (typ.)
- Nominal not equal to “Actual” dimensions LUMBER “SAWN” Close to Nominal Then dried and surfaced Up to 6 inches - actual is 1/2 inch less Greater than 6 inches - actual is 3/4 inch less WHY THE “BREAK AT 6”??? MORE DISTORTION & SHRINKAGE TO ACCOMMODATE DURING SURFACING
- Typically; Two (2) foot increments Sizes; 8’, 10’, 12’, 14’, & 16’ WHY NOT Typically LONGER??? Exceptions; 93 inch studs WHY 93 INCHES??? Special order lengths
- Established by American Plywood Association (APA) Standards based on; Structural adequacy Dimensional Stability UNDER VARYING MOISTURE CONDITIONS Durability of Adhesive
- Lamination Process SELECT LUMBER, GRADE JOINTS - FINGER OR SCARF ADHESIVES BASED ON EXPECTED MOISTURE Why Laminate? Create a size not available naturally Create Shapes ARCHES, CURVES, ETC. Improved Quality PROCESS CONTROLLED DEFECTS REMOVED / CONSIDERED GRAIN DIRECTION CONTROLLED USES CHURCHES LARGE RESIDENTIAL LODGES, RESTAURANTS
- http://www.socalgas.com/construction/builders/Builders%20Resource%20Guide/Engineered%20Wood%20Wall%20Framing.htm
- Uses FLOORS & ROOFS Sizes Typically, 9-1/2” TO 24 “ DEEP LENGTH UP TO 40 FEET+ Composition & cost TOP & BOTTOM - LUMBER OR Laminated WEB - OSB, PLYWOOD COST - COMPARABLE TO 2x
- Why Panelize? More “controlled” product (strength, shrinkage, etc.) Efficient use of forest products Increase labor productivity Types Plywood Composite panels Veneered panels
- Thin layers of veneer glued together VENEERS - ROTARY CUT Odd number of veneers Alternating direction of veneers Face veneers parallel USES SAME AS OSB EXPOSED/PAINTED SURFACES FORMWORK COST MORE THAN OSB
- Based on the smoothness & integrity of the veneers Classifications; A, B, C (plugged), C, D B and better sanded smooth Price Variances (2001) 23/32 Exterior A/C = $31 per panel 23/32 Exterior B/C = $20 per panel MOST FORMWORK B/C FINISH AREAS MAY REQUIRE “A”
- INTRODUCED IN THE EARLY 80’s GETTING WIDESPREAD USE Long strand like wood particles Alternate grain orientation (3-5 layers) Compressed / glued Strongest of the Non-veneered WHY IS IT THE STRONGEST??? ORIENTATION OF STANDS Generally more economical than Plywood Uses; Sheathing for floor, roofs, & siding WHY IS IT GETTING WIDESPREAD USE??? STRUCTURALLY SOUND ECONOMICAL - SUBBSTITUTE FOR PLYWOOD NEW GROWTH TREES
- Combustibility FIRE RETARTANT IMPREGNATED UNDER PRESSURE Decay & Insect PRESSURE IMPREGNATED UP TO 30 YEAR LIFE TYPES CREOSOTE PENTACHOROPHENOL - OILY, CAN’T PAINT WATERBORNE SALTS - GREENISH - CAN PAINT Chromated Copper Arsenate (CCA) being phased out HIGH MOISTURE USES – WHY NOT USE DECAY RESISTANT WOODS??? (CEDAR, REDWOOD, CYPRESS) COST & STRENGTH
- Common flat heads, used mostly for structural connections Finish Nails virtually headless, finish woodwork Common - Used for Framing, Large Shank & Head Box - Smaller Shank, less chance for splitting wood, Used Shingles, Rough Casings Casing, Finish, Brad - Finish Components, Sink Head Deformed Shank - Very Hard to Remove, DW & Flr. Concrete - Masonry & Concrete Cut - Finish Flooring - SQ Head Reduces Cracking Roofing - One of Many, Some Have lead/Rubber Washers
- Size - Measured in “pennies” (Price of 100 nails long ago) Corresponding Lengths Same for Common & Finish Most Common Light Frame Nails - 16d for 2”, 10D AND 8D Coatings Bright/ Plain uncoated steel MOST COMMON USED - NON CORROSIVE OR CONCEALED CONDITION Corrosion-resistant “ EXPOSED TO WEATHER RUST OR STAIN LUMBER GALVANIZED, ALUM., SS Resin/Vinyl Decrease Drive & Increase Holding This nail has a smaller shaft – commonly called a ‘sinker’
- Anchorage Face - Perpendicular to Grain End - Parallel Toe - Angle to Grain Which Has the Most Holding Power??? Which is most common???
- APPLICATIONS FRAMING SHEATHING ROOFING
- “ Head” type PHILLIPS SLOTTED SQUARE HEAD PAN, FLAT, ROUND, ETC. Sizing - Gauge & Length WIRE GAUGE (SAMPLES #8 & #10) LENGTH IN INCHES (AND FACTIONS) Installation HAND SCREW DRIVER “ SCREW GUN”, OR DRILL HOLDING POWER TIGHTER, STRONGER THAN NAILS CAN BE “BACKED” OUT, & REINSERTED Uses CABINETWORK SOME FRAMING APPLICATIONS DECKING - BETTER HOLD - LESS SQUECK
- Lag Screws Large screws Very LARGE Screws, Wrench, ¼ “@ 2-6 in., ½ to 10” FOR HEAVIER STRUCTURAL CONNECTIONS Square or octagonal head Installed w/ wrench Drywall screws Used to attach drywall Drywall Screws (Size, 1 ¼, 1 5/8, 2 “, Screw Gun - Fast, Wood or Metal,
- Heavier structural connections Sizes 1/4 inch to 1 inch+ LENGTH; ABOUT ANY (PRACTICALLY 10-12”) Types Machine SQUARE OR OCTAGONAL HEAD USED WITH WASHER Carriage ROUND BUTTON HEAD SQUARE SHANK INHIBITS TURNING Washers DISTRIBUTE THE COMPRESSIVE FORCE
- NUMEROUS TYPES AND SHAPES MOST COMMON - JOIST HANGER LIGHT WOOD FRAMING - ATTACHED WITH SCREWS OR NAILS HEAVY TIMBER - ATTACHED WITH BOLTS / LAGS
- ON SITE LESS USES BECAUSE OF NEED TO CLAMP USES FLOOR SHEATHING BASE (SOLE) PLATES WALL PANELS PANELING (WHERE THERE IS A NEED FOR CONCEALED FASTENERS) INCREASE STIFFNESS, ELIMINATE “SQUEAK”