BAP BAP Weatherization & Retrofit Measures 2

Question 1

What does 'ACH50' measure in the context of building performance testing?

Accepted Answer

The number of times the building's air volume is exchanged per hour at 50 Pascals of pressure

Answer

ACH50 (air changes per hour at 50 Pascals) normalizes blower door CFM50 by the building volume, allowing comparison of airtightness across differently sized homes.

Question 2

After tightening a home's envelope, what must a BAP analyst verify to maintain indoor air quality?

Accepted Answer

That mechanical ventilation is adequate per ASHRAE 62.2 or equivalent standard

Answer

Tightening the envelope reduces natural infiltration, so mechanical ventilation must be verified or added to maintain acceptable indoor air quality per ASHRAE 62.2.

Question 3

What is the purpose of a 'house-to-outside' duct leakage test (Qn,out)?

Accepted Answer

To quantify only the duct leakage that goes to unconditioned spaces outside the thermal envelope

Answer

Duct leakage to outside (Qn,out) measures only the leakage from ducts into unconditioned spaces like attics or crawlspaces — the leakage that directly wastes conditioned air.

Question 4

In a hot-humid climate (US Climate Zone 2), where should the vapor retarder generally be located in a wall assembly?

Accepted Answer

Vapor retarders are not recommended in hot-humid climates

Answer

In hot-humid climates, interior vapor barriers trap moisture driven inward by cooling systems, so most building codes and energy programs avoid interior vapor retarders in these zones.

Question 5

What R-value per inch does open-cell spray polyurethane foam (ocSPF) typically provide?

Accepted Answer

R-3.5 to R-3.8 per inch

Answer

Open-cell SPF provides approximately R-3.5 to R-3.8 per inch due to its lower density and partially open cell structure, compared to about R-6 per inch for closed-cell SPF.

(BAP) Building Analyst Professional Practice Test

(BAP) Building Analyst Professional Practice Test

BAP BAP Weatherization & Retrofit Measures 2