State types of softwood
Spruce
Douglas fir
Larch
State types of hardwood
Beech
Oak
Ash
Mahogany
Why are knots?
Formed by branches enclosed within a trunk
State preservation treatments for wood
Oil based
Waterborne- fixed and unfixed
Light organic solvent - fungicides and insecticides
What factors affect the strength of wood?
Density
Drying
Defects
What is plywood?
Thin flat layers of wood glued together
What is particle board?
Wood fragments combined with resin under pressure
Chipboard and strand board
What is fibreboard?
Wood fibres mixed with resin and pressed at temperature to bond
What is glulam?
Small sections of wood finger jointed together
State an advantage of glulam
can produce shapes that would otherwise be difficult to achieve with standard timber
What is CLT?
Cross ply laminated board bonded with adhesive and pressure applied during bonding
