TIMBER

TIMBER

1. PROPERTIES

   • HARDNESS
     • FRAGILITY
       • DUCTILITY
         • FLEXIBILITY/PLASTICITY
           • POROSITY/PERMEABILITY
             • DENSITY
               • CONDUCTIVITY
                 • DURABILITY/LIFESPAN
                   • REUSABILITY/RECYCLABILITY
                     • SUSTAINABILITY/CARBON FOOTPRINT
                       • COST
                         • effective, labour dependent for on site work
                       • very low embodied energy
                     • very high
                   • can very durable, type seasoning finishing fixing dependent
                 • poor conductor of heat & electricity
               • timber type dependent
             • high seasoning & finishing dependent
           • high flexibility medium plasticity
         • medium-low geometry dependent
       • medium-low can be easily marked
     • type dependent

2. SPECIFYING & HANDLING

   • SIZE
     • STRENGTH GRADE
       • MOISTURE CONTENT
         • SPECIES OF WOOD
           • AVAILABILITY
             • TREATMENT
               • KNOTS
                 • DURABILITY
                   • PROTECTION
                     • against water
                       • -avoid exposure, -seal(paint), -particular care for end grain
                     • insect attack
                       • chemical/physical barriers
                     • sunlight &heat
                       • direct sunlight :break down wood/cellulose
                         • light color paint
                     • OTHER HAZARDS
                       • fire, chemical exposure
                   • water related damage, fungal attack(moisture >20%), swelling shrinkage(cracks)
                 • weak points, cause slope of grain
                   • at the top of beams- compression
               • treatment or insect repellent treatments
             • limitation
           • provide different performance & appearance
         • seasoned: <15%
       • F-GRADE & MGP GRADINGS
     • depth x breadth
       • choose the available size before specifying
         • length