Wood Flashcards
INTRODUCTION
RENEWABLE RESOURCE, GIVEN SUSTAINABLE MANAGEMENT
EASILY CUSTOMIZED
IMPLEMENTED BY LOW SKILL LABOR
VERSATILE AND EASILY CUSTOMIZED
EFFICIENT CONSTRUCTION TIME
CAN BE RECLAIMED AND REUSED
PERFORMS EFFECTIVELY IN COMPRESSION AND TENSION
WASTE FROM ONE PROCESS USED TO CREATE WOOD BASED PRODUCTS OR FUEL
GROWTH CHARACTERISTICS
IN GENERAL TREES GROW FASTEST UNDER MOIST AND COOL CONDITIONS
TYPES
GYMNOSPERMS - SOFT WOOD
ANGIOSPERMS - HARD WOOD
MANUFACTURING PROCESS
FELLING DEBARKING BUCKING - CUT TO LENGTHS SEASONING - DRYING GRADING - QUALITY CONTROL
CUTS
PLAINSAWN - MOST PRODUCT, LEAST STRONG
QUARTERSAWN - LESS PRODUCT, STRONGER
RIFTSAWN - LEAST PRODUCT, STRONGEST
SEASONING
EVAPORATION OF MOISTURE CONTENT GREEN LUMBER 30% OR MORE MC SEASONED LUMBER 19% OR LESS MC SEASONED LUMBER IS STRONGER STIFFER AIR DRIED OR KILNED
SHRINKAGE
RADIAL PERPENDICULAR TO THE GRAIN
TANGENTIAL PARALLEL TO THE GRAIN
SUSTAINABLE DESIGN
USE RESOURCES EFFICIENTLY
SPECIFY LOWEST GRADE FOR APPLICATION
SELECT LESS COMMON SPECIES
DESIGN WITH STANDARD DIMENSIONS TO REDUCE WASTE
UTILIZE THREADED FASTENERS FOR DISASSEMBLY
SIMPLIFY DETAILS
USE CERTIFIED WOOD
CONNECTIONS
MORTISE AND TENON NAILS SCREWS BOLTS TOOTHED PLATES PRE-MANUFACTURED CUSTOM ENGINEERED
DIMENSIONS
BOARDS LESS THAN 2”
DIMENSION LUMBER 2” X 4” = 1 1/2” X 3 1/2”
TIMBER GREATER THAN 5”
SOLD BY BOARD FOOT
NOMINAL DIFFERS FROM ACTUAL DIMENSION
STRUCTURAL PROPERTIES
SPECIES GRADE - APPEARANCE OR STRENGTH DIRECTION OF LOAD - STRONGER PARALLEL TO GRAIN STRONGER IN COMPRESSION THAN TENSION LIKE STEEL HAS USEFUL TENSILE STRENGTH
DURABILITY AND WEATHERING DEPENDS ON…
SPECIES GROUND CONTACT PROTECTIVE COATING PRESSURE TREATMENT DETAILING
DECAY RESISTANCE
EXCEPTIONAL - BLACK LOCUST
RESISTANT - CYPRESS, CEDAR, JUNIPER, WHITE OAK, RED OAK, BLACK WALNUT
MODERATE - SECOND GROWTH CYPRESS, DOUGLAS FIR, SECOND GROWTH RED OAK
COATINGS AND TREATMENTS
PRESERVATIVES
CHEMICAL MODIFICATION
COATING
THERMAL MODIFICATION
