Roof Sailing Roof Ventilation and Attic Systems

Question 1

What is the minimum net free ventilation area required per square foot of attic floor space under the IRC?

Accepted Answer

1/300 of floor area

Answer

1/100 of floor area

Answer

1/150 of floor area

Answer

1/500 of floor area

Question 2

What is the benefit of a balanced ventilation system (equal intake and exhaust) in a residential attic?

Accepted Answer

Creates consistent airflow that removes heat and moisture without short-circuiting

Answer

Reduces cooling costs only

Answer

Eliminates the need for insulation

Answer

Prevents ice dams on south-facing slopes only

Question 3

Where should intake vents be located in a properly designed attic ventilation system?

Accepted Answer

At or near the eaves or soffits

Answer

At the ridge only

Answer

At gable ends only

Answer

At the center of the roof slope

Question 4

What problem can occur when attic insulation blocks soffit intake vents?

Accepted Answer

Reduced ventilation causing moisture buildup and heat accumulation

Answer

Increased fire risk

Answer

Structural roof damage from weight

Answer

Increased shingle reflectivity

Question 5

What device is installed at the soffit to maintain the airway between attic insulation and the roof deck?

Accepted Answer

Baffle (insulation dam / rafter vent)

Answer

Rafter tie

Answer

Vapor barrier

Answer

Radiant barrier

Question 6

Which type of ridge vent performs best in high-wind conditions?

Accepted Answer

External baffle ridge vent

Answer

Open-cut ridge without cap

Answer

High-profile hip-style vent

Answer

Static box vent near the ridge