CLC Weatherproofing & Energy Efficiency 2

Question 1

What is the recommended minimum R-value for attic insulation in a cold climate zone (Zone 5-8) per IECC standards?

Accepted Answer

R-49

Answer

IECC recommends R-49 minimum for attic insulation in climate zones 5-8 to meet energy efficiency requirements.

Question 2

Which type of window glazing provides the best solar heat gain control while maintaining visible light transmission?

Accepted Answer

Low-E coated glass

Answer

Low-E (low emissivity) coatings selectively filter infrared radiation, reducing heat gain while allowing visible light through.

Question 3

A lead carpenter discovers a thermal bridge at a steel lintel above a window. What is the best corrective approach?

Accepted Answer

Add a continuous layer of rigid foam insulation over the lintel on the exterior

Answer

Continuous rigid foam insulation on the exterior breaks the thermal bridge by preventing direct conductive heat transfer through the steel.

Question 4

What is the primary purpose of a house wrap (such as Tyvek) installed under siding?

Accepted Answer

Serve as a water-resistive barrier while allowing vapor to escape

Answer

House wrap is a water-resistive barrier (WRB) that blocks liquid water infiltration while remaining vapor-permeable to allow drying.

Question 5

When installing blown-in insulation in existing walls through drilled holes, what is the correct hole spacing typically used?

Accepted Answer

Every stud bay, about 16 or 24 inches on center

Answer

Holes are drilled in each stud bay (typically 16" or 24" O.C.) to ensure every cavity is filled with blown-in insulation.

(CLC) Certified Lead Carpenter Practice Test