BPI Insulation Standards 4

Question 1

According to BPI, which climate zones require vapor retarders on the interior (warm-in-winter) side of wall assemblies?

Accepted Answer

Climate Zones 5, 6, 7, and 8

Answer

Cold climate zones (5–8) require Class I or II vapor retarders on the interior side of wall assemblies to prevent wintertime condensation within the assembly.

Question 2

Which type of insulation is most appropriate for insulating pipes in an unconditioned attic?

Accepted Answer

Rigid foam pipe insulation or foam-in-place insulation

Answer

Pre-formed rigid foam or foam-in-place pipe insulation provides a continuous thermal barrier around pipes, protecting against freezing and heat loss.

Question 3

In a BPI energy audit, 'attic bypasses' refer to which of the following?

Accepted Answer

Hidden air leakage pathways connecting conditioned space to the attic

Answer

Attic bypasses are unintended air pathways — such as open top plates, electrical chases, or balloon framing — through which conditioned air escapes into the attic.

Question 4

When installing blown-in fiberglass insulation in an attic, why do installers use depth markers?

Accepted Answer

To ensure the insulation is installed to the correct depth for the specified R-value

Answer

Depth markers (ruler stakes) are placed throughout the attic so installers can verify that the blown insulation achieves the required depth to meet the specified R-value.

Question 5

What is the main risk of using open-cell spray foam on the underside of roof sheathing in a cold climate without proper planning?

Accepted Answer

Moisture can accumulate in the sheathing because open-cell foam is vapor permeable

Answer

Because open-cell foam is vapor permeable, moisture vapor can pass through it and condense on the cold roof sheathing, leading to decay and structural damage in cold climates.

(BPI) Building Performance Institute Certified Practice Test

(BPI) Building Performance Institute Certified Practice Test

BPI Insulation Standards 4