BAP Building Envelope & Insulation 2

Question 1

What is the primary benefit of installing continuous insulation (ci) on the exterior of a wall assembly?

Accepted Answer

It eliminates thermal bridging through the framing members

Answer

Continuous exterior insulation covers the framing members, eliminating the thermal bridges that studs or metal tracks create in a standard cavity-insulated wall.

Question 2

What does the metric ACH50 represent in a blower door test?

Accepted Answer

Air changes per hour measured at a depressurization of 50 Pascals

Answer

ACH50 (Air Changes per Hour at 50 Pascals) is the standardized blower door metric that quantifies envelope airtightness by relating total air leakage to building volume.

Question 3

In a vented attic assembly, at what plane should the air barrier be installed?

Accepted Answer

At the ceiling plane — the floor of the attic above conditioned space

Answer

In a vented attic the air barrier belongs at the ceiling plane to prevent conditioned air from escaping into the unconditioned attic space where it could cause moisture problems.

Question 4

Kraft-faced fiberglass batt insulation is classified under building codes as which class of vapor retarder?

Accepted Answer

Class II (0.1–1.0 perms)

Answer

Kraft facing on fiberglass batts has a permeance rating between 0.1 and 1.0 perms, placing it in the Class II vapor retarder category under the IRC and IECC.

Question 5

How does the stack effect influence air leakage through a building envelope?

Accepted Answer

Warm air rises creating positive pressure at the top and negative pressure at the bottom, driving infiltration and exfiltration

Answer

The stack effect results from buoyancy of warm air — positive pressure at upper levels drives exfiltration through the top of the envelope, while negative pressure at lower levels drives infiltration at the base.

(BAP) Building Analyst Professional Practice Test

(BAP) Building Analyst Professional Practice Test

BAP Building Envelope & Insulation 2