Pitched roof structure and ventilation – pathology

Question 1

Understanding how and why pitched roof structure is file:

Answer 1

Question 2

The process can be divided into three overlapping stages:

Answer 2

Question 3

Timber decay through moisture content, excepted levels are:

Answer 3

Question 4

Distorted roof diagram: Movement in line with the rafters

Answer 4

Question 5

Distorted roof diagram 2: Movement in line with the rafters

Answer 5

Question 6

Distorted roof diagram: movement in line with the rafters, effect on upper parts of the wall - Roof Spread

Answer 6

Question 7

Movement at 90° to the rafters, no gable restraint straps diagram:

Answer 7

Question 8

Possible cause of timber decay in site cut roof structure:

Answer 8

Question 9

Possible cause of wood boring beetle infestation in site cut roof structure

Answer 9

Question 10

Possible cause of movement in site cut roof structure:

Answer 10

Question 11

Possible cause of defects in timber trust rafter roof structure:

Answer 11

Question 12

Possible cause of defects in metal framed roof structure:

Answer 12

Question 13

Possible cause of defects in fixings and restraint straps:

Answer 13

Question 14

Possible cause of defects in roof ventilation:

Answer 14