Roof Sailing Roof Ventilation Systems

Question 1

What is the primary purpose of proper attic ventilation in a roofing system?

Accepted Answer

To regulate temperature and moisture levels in the attic

Answer

Proper attic ventilation maintains temperature and moisture balance, preventing heat buildup in summer and condensation/ice dams in winter.

Question 2

According to FHA and most building codes, what is the minimum net free ventilation area (NFVA) required per square foot of attic floor?

Accepted Answer

1/150

Answer

Building codes generally require 1 square foot of NFVA per 150 square feet of attic floor without a vapor barrier, or 1:300 with a vapor barrier.

Question 3

In a balanced ventilation system, intake vents are located where on the roof assembly?

Accepted Answer

At the soffit or eaves

Answer

In a balanced system, intake (low) vents are located at the soffit/eave and exhaust (high) vents are near the ridge to leverage natural air convection.

Question 4

Which type of roof vent is installed at the peak of the roof and runs continuously along the ridge?

Accepted Answer

Ridge vent

Answer

A ridge vent is installed along the full length of the roof peak, allowing warm moist air to exhaust evenly across the entire attic.

Question 5

What problem can occur when a power attic ventilator (PAV) is installed without adequate intake ventilation?

Accepted Answer

The PAV draws conditioned air from the living space, increasing energy costs

Answer

Without sufficient intake vents, a PAV creates negative pressure and pulls conditioned air from the house through gaps, significantly increasing energy bills.

Roof Sailing Practice Test

Roof Sailing Practice Test

Roof Sailing Roof Ventilation Systems