timber + walls

Question 1

Section of a trunk/piece of timber - elements

from centre-exterior

Answer 1

• pith
• heartwood (usually darker)
• sapwood (usually lighter)
• both which have annular rings and medullary rays
• cambium layer
• bark

Question 2

timber shrinkage

Answer 2

depending on where/how you cut it
timber shrinkage - sapwood (new part of tree) has higher moisture content = shrinks from 25-12%

Question 3

sawing techniques (2)

Answer 3

plain-sawed
quater-sawed

Question 4

Limitations of timber (2)

Answer 4

reacts to moisture (hygroscopic) - needs treatment
termites, other insects that eat it

Question 5

Kinds of woodchips

Answer 5

Sawlog
Pulplog

Question 6

Plywood - how is it made + different grades

Answer 6

Thin sheets of timber / timber veneer glued together

Quality creates different grades - marine ply - water resistant

Question 7

Timber boards (2)

Answer 7

MDF (Medium density fibreboard)

Chipboard/fibreboard

Question 8

Beams

Answer 8

Timber beams - rafters, trusses
Laminated veneer lumber (LVL)

Question 9

Threaded bar

Answer 9

Bolt + washer through timber

Question 11

Masonry bonds
(brick walls)

Answer 11

Stretcher (traditional)
Stack
English Cross
Garden wall
Soldier course (vertical at the top)
Common bond (headers every 8th course)

Question 12

Kinds of brick walls
(3)

Answer 12

Traditional cavity
Brick veneer (load-bearing timber frame)
Concrete block cottage eall