Power Efficiency Guide

Ultimate Guide to Power Efficiency

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1. Which items listed are issues associated with the design of the building envelope?

a. Energy costs in the early 1970s led to the design of building envelopes that were more energy efficient and airtight.

b. Relative humidity levels in occupied buildings are frequently around 40 percent.

c. Energy code changes require higher R-values for exterior walls.

d. All of the above

2. Key elements for controlling moisture in a cold or very cold climate multi-component wall are:

a. The vapor barrier-retarder.

b. Air and water barriers.

c. Type and location of the insulation.

d. All of the above.

3. The major design concerns to consider when using studs and mounting them on the floor are:

The deflection in the floor is transferred to the outer wall element. The design causes the single most expensive element of the wall to handle this deflection.

A six-inch stud, filled with fiberglass insulation, at 16-inch centers has a theoretical R-value of R-21 but actually delivers only an R-value of R- 7.4.

4. Mold is a major concern in multi-component walls. The three elements required for mold to grow are:

a. Water, moderate temperature, food source b. Water, very cold temperature, food source c. Water, arid temperature, food source d. None of the above.

5. The advantages of rainscreens in the wall system are:

a. Rainscreens allow a wall system to drain liquid and to vent vapor.

b. Rainscreens do not maintain pressure equalization.

c. Rainscreens allow backside ventilation to help eliminate moisture.

6. Surface sealed (wet sealed) metal systems are popular but are questionable as rainscreens because;

a. They have minimal venting.

b. Can also act as a second vapor barrier.

c. Rely on perfect installation.

d. All of the above.

7. A superior performance wall system:

a. Functions in all climatic conditions.

b. Does not have an ASHRAE rated insulation R value.

c. Does not have a contained air space working as a pressure equalization chamber.

d. Relies on a multi-component system with numerous separate air, water, and vapor barriers over insulated metal studs.

8. Sustainable building design includes materials that exhibit which of the following?

a. Recyclability b. Thermal efficiency c. Durability d. All of the above.

9. Building material factors to consider during the design phase are the rainscreen, window selection, and insulation.

10. For the wall system to be sustainable, durability must minimize potential for water-related damages.

A. True

B. False

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