Building Technology 1: Building Materials

Type of wood that comes from conifers which have needles instead of leaves

• Hardwood

• Softwood

• Plywood

• Boardwood

Type of wood that comes from broad-leaved or deciduous trees.

• Hardwood

• Softwood

• Plywood

• Boardwood

Which is not a characteristic of a hardwood?

• Heavy

• Less environmental impact

• Darker color

• More expensive

Central core of a log

• Sapwood

• Heartwood

• Trunk

• Annual rings

Defect of wood: Caused by the attacked of fungi.

• Checks

• Shakes

• Decay

• Knots

Defects of wood: these are cracks between and parallel to the annual rings of growth.

• Decay

• Knots

• Shakes

• Checks

Defects of wood: These are irregular growths in the body of a tree which interrupt the smooth curve of the grain. The fibers of the tree are turned from their normal course and grow around the knot at that point of the tree

• Pitchpockets

• Wane

• Knots

• Shakes

Defects of Wood: These are well-defined openings between annual rings containing solid or liquid pitch.

• Knots

• Pitchpockets

• Wane

• Checks

Refers to wood cut radially to the annual rings of growth parallel to the rays or, in commercial practice, cut with the annual growth rings at an angle 45 to 90 degrees

• Plainsawn

• Quartersawn

• Riftsawn

• Jigsawn

lumber is preferable when a pleasing pattern is required, as in wall paneling.