Insulation and Interior Inspection Section#1 Insulation and Ventilation Quiz#7

This study session covers venting of roof spaces. The estimated completion time for this study session is thirty minutes. Objectives At the end of this study session, you should be able to: List three functions of roof vents. List four types of roof vents. Describe the percentage of venting that should be at the soffits and near the peak of the roof. Describe in two sentences the pros and cons of turbine type vents. Describe in one sentence the function of soffit vent baffles. Define how much ventilation is needed for attics. Define how much ventilation is needed for low-slope, flat and cathedral roofs. Describe in two sentences how mansard and gambrel roofs should be vented. Describe in one sentence whether over venting is possible. Describe in one sentence why power roof vents should not operate in the winter. Question 1 Needs Grading How are mansard or gambrel roofs ideally vented? Selected Answer: Vents are required at the ridge and at the bottom of the upper section. Lower section of the roof doesn't need to be ventilated.  Correct Answer:   1. Required at the ridge and bottom of upper section 2. None is required for steep section Response Feedback: [None Given] Question 2 Needs Grading Is it possible to over-ventilate an attic? If so, why is this an issue? Selected Answer: Yes. Using of a power vent may over-vent attic. This tends to depressurize the attic and draw warm, moist air up into the roof space, again possibly causing condensation and damage.  Correct Answer:   1. Yes, if the ceiling is not well sealed 2. Can cause negative pressure in attic that promotes warm, moist air to enter at a faster rate Response Feedback: [None Given] Question 3 Needs Grading List four types of roof vents. Selected Answer: 1. Soffit vent 2. Ridge vent 3. Roof vent 4. Gable vent Correct Answer:   1. Soffit 2. Ridge 3. Roof 4. Gable Response Feedback: [None Given] Question 4 Needs Grading List three functions of roof vents. Selected Answer: 1. Venting allows warm, moist air out of the attic before the moisture condenses on structural member.  2. Venting reduces attic temperatures in the summer by allowing hot air to escape.  3. Venting helps prevent ice dams by keeping the attic cold in winter.  Correct Answer:   1. Allow warm, moist air out of the attic 2. Reduce attic temperatures in summer 3. Help prevent ice dams in winter by keeping attic cold Response Feedback: [None Given] Question 5 Needs Grading What amount of ventilation is typically recommended for attics? Selected Answer: The total vent area is often recommended to be 1/300 of the floor space of the attic. If the attic is 600 square feet, we would look for 2 square feet of unobstructed or free vent area.  Correct Answer:   1/300 of the floor space of the attic Response Feedback: [None Given] Question 6 Needs Grading What amount of ventilation is typically recommended for low slope, flat or cathedral roofs? Selected Answer: 1/150 of the roof area Correct Answer:   1/150 of the floor space of the attic Response Feedback: [None Given] Question 7 Needs Grading What do soffit vent baffles do? Selected Answer: Baffles prevent soffit vents from becoming obstructed by insulation and help reduce wind washing by directing air flow away from the insulation Correct Answer:   Prevent insulation from covering the vents Response Feedback: [None Given] Question 8 Needs Grading What percentage of the total venting should be at the soffits? Selected Answer: At least 50% Correct Answer:   At least 50% Response Feedback: [None Given] Question 9 Needs Grading What percentage of the total venting should be high on the roof? Selected Answer: 50% Correct Answer:   50% or less Response Feedback: [None Given] Question 10 Needs Grading What problems are commonly found with turbine vents? Selected Answer: 1. Don't work without wind 2. Can depressurize the attic on windy days 3. Can be noisy 4. Often seize 5. Often leak Correct Answer:   1. Don?t work on calm days 2. Often noisy or seized 3. Can depressurize the attic on windy days 4. Often covered up to prevent water leakage into attic Response Feedback: [None Given] Question 11 Needs Grading When can soffit venting be omitted safely? Selected Answer: If gable vents are installed at the opposite ends of the attic, soffit venting can be omitted.  Correct Answer:   If there are gable vents at opposing ends Response Feedback: [None Given] Question 12 Needs Grading Why should power roof vents not be operated in the winter? Selected Answer: It could depressurize the attic and draw warm and moist air up into the roof space, causing possible condensation and damage.  Correct Answer:   They tend to depressurize the attic in winter, again promoting entry of warm, moist air Response Feedback: [None Given]