GAF Ventilation & Attic Systems

Question 1

What is the minimum net free area (NFA) of ventilation required per 150 square feet of attic floor space when there is no vapor barrier?

Accepted Answer

1 square foot per 150 sq ft

Answer

1 square foot per 100 sq ft

Answer

1 square foot per 300 sq ft

Answer

1 square foot per 50 sq ft

Question 2

Which type of attic ventilation system uses both soffit vents and a ridge vent to create airflow through natural convection?

Accepted Answer

Balanced ventilation system

Answer

Power ventilation system

Answer

Exhaust-only system

Answer

Intake-only system

Question 3

GAF's Cobra® Ridge Vent products are designed primarily to function as which component of attic ventilation?

Accepted Answer

Exhaust ventilation

Answer

Intake ventilation

Answer

Vapor barrier

Answer

Air barrier

Question 4

What problem can result from having more exhaust ventilation capacity than intake ventilation capacity in an attic?

Accepted Answer

Short-circuiting where air is pulled in through exhaust vents

Answer

Excessive moisture buildup

Answer

Overheating of roof shingles

Answer

Premature ridge vent corrosion

Question 5

According to proper ventilation principles, what percentage of the total NFA should be allocated to intake vents versus exhaust vents?

Accepted Answer

50% intake, 50% exhaust

Answer

25% intake, 75% exhaust

Answer

75% intake, 25% exhaust

Answer

60% intake, 40% exhaust

Question 6

Which condition in an attic is most commonly caused by inadequate ventilation during winter months?

Accepted Answer

Ice dam formation

Answer

Dry rot of rafters

Answer

Excessive dust accumulation

Answer

UV degradation of insulation

Question 7

When installing a GAF ridge vent over a shingle roof, what must be cut along the ridge to allow proper airflow?

Accepted Answer

A slot through the roof deck on both sides of the ridge

Answer

Holes in every rafter bay

Answer

Removal of the ridge board

Answer

Slots through only the shingles, not the deck