2: Roof as a System

Question 1

Main responsibilities of maintenance and inspection program

Answer 1

Avoid clogged drains & ponding water

ensure integrity of flashing & membrane - splits, bare spots, blisters, lap seam opening do not worsen

Question 2

Roof experts reject the notion that ponding water was once a good thing for the roof for what reason?

Answer 2

Cooled the roof

Question 3

3 basic components of a roof system

Answer 3

1. Structural Deck
2. Thermal Insulation
3. Membrane

Question 4

4th component of the deck?

Answer 4

Vapor Retarder

Question 5

_________ seals joints where the membrane is pierced or terminated - gravel stops, walls, curbs, expansion joints, vents, drains

Answer 5

Flashing

Question 6

Metal roof panels serves as what 2 components?

Answer 6

membrane and deck

Question 7

4 major functions of the structural deck?

Answer 7

1. Deflection
2. Component anchorage
3. dimensional stability
4. fire resistance

Question 8

Decks can be nailed or non-nailable (or both). Provide examples

Answer 8

poured concrete is generally non-nailable

wood is generally nailable

Question 9

When can poured concrete be considered nailable?

Answer 9

mechanically fastened single ply systems incorporated predrilled anchors

Question 10

Primary functions of insulation vs secondary

Answer 10

Primary = cuts heating and cooling costs, enhances interior comfort, prevents condensation on interior

Secondary = horizontal shear strength allows membrane to distribute stresses over wider range

Question 11

what is used to level the substrate on a steel deck?

Answer 11

insulation

Question 12

4 structural properties of insulation

Answer 12

1. shearing strength - distribute tensile stresses of membrane
2. compressive strength - withstand traffic loads
3. cohesive strength - resist delamination
4. dimensional stability - under thermal and moisture changes

Question 13

shielding surfaces of Mod-Bit?

Answer 13

factory-embedded granules
factory-bonded metal foils
field-applied reflective coatings

Question 14

Base Flashings - what is their purpose?

Answer 14

protect and seal the upturned edges of the membrane where it is pierced or terminated

Question 15

Counter Flashings & Cap Flashings

Answer 15

shield the exposed edges of the base flashing

Question 16

Counter flashings are often made of what?

Base Flashing are often made of what?

Answer 16

Counter = sheet metal

Base = non-metals - felts, fabrics, elastomerics, plastics,