Course outline
Module 1
Module 1: Insulation Fundamentals and R-Value
Insulation Fundamentals and R-Value
Knowledge check
Q1. What does R-value measure in insulation?
- A. The speed at which heat is generated by a material
- B. A material's resistance to heat flow ✓
- C. The weight of insulation per square foot
- D. The amount of moisture a material can absorb
Why: R-value is a measure of thermal resistance: the higher the R-value, the better the material resists the flow of heat through it.
Q2. As the R-value of an insulation product increases, what happens to its insulating performance?
- A. It decreases
- B. It stays the same
- C. It improves ✓
- D. It becomes unsafe
Why: A higher R-value means greater resistance to heat flow, so the insulation performs better at keeping heat in or out.
Q3. What does the 'R' in R-value stand for?
- A. Radiation
- B. Rate
- C. Resistance ✓
- D. Reflection
Why: The R stands for thermal resistance, which is the core concept the rating describes.
Q4. Which factor does NOT directly affect the total R-value of an insulated wall?
- A. The type and thickness of insulation material
- B. The color of the exterior paint ✓
- C. The presence of air gaps
- D. The number of insulated layers
Why: Paint color affects solar heat absorption at the surface, but the R-value depends on the insulation material, its thickness, air gaps, and layering, not paint color.
Q5. Why do R-values for insulation products sometimes get listed per inch of thickness?
- A. Because insulation gets thicker as it ages
- B. Because R-value scales with thickness, so per-inch ratings allow fair comparison across products ✓
- C. Because building codes require measurement in inches
- D. Because R-values are only valid for one-inch layers
Why: Listing R-value per inch lets you compare materials regardless of the thickness installed, and the total R-value is the per-inch value multiplied by the thickness.
Module 2
Module 2: Insulation Materials Compared
Insulation Materials Compared
Knowledge check
Q1. Which insulation material is made from recycled paper treated with fire retardant and is commonly blown into attics?
- A. Fiberglass batts
- B. Cellulose ✓
- C. Polyurethane spray foam
- D. Mineral wool boards
Why: Cellulose insulation is made from recycled newsprint and cardboard treated with borate fire retardants. It is typically blown into attics and wall cavities as loose-fill.
Q2. What does the R-value of an insulation material measure?
- A. How quickly heat flows through the material
- B. How well the material resists heat flow ✓
- C. How much moisture the material can absorb
- D. How loud the material is at blocking sound
Why: R-value measures thermal resistance, meaning how effectively a material slows heat flow. A higher R-value indicates better insulating performance for a given thickness.
Q3. Which insulation material is known for being naturally fire-resistant and also providing good sound dampening?
- A. Rigid foam board
- B. Mineral wool ✓
- C. Cellulose
- D. Plastic bubble wrap
Why: Mineral wool, made from rock or slag, is naturally non-combustible and resists high temperatures. It also absorbs sound well, making it popular for fire-rated walls and noisy areas.
Q4. What is a common drawback of fiberglass batt insulation if it is installed poorly?
- A. It becomes flammable when exposed to sunlight
- B. Gaps and compression reduce its effective R-value ✓
- C. It dissolves when exposed to humidity
- D. It emits strong odors that last for years
Why: Fiberglass batts lose performance when compressed, when they have gaps, or when they are cut around wiring and framing poorly. Air leakage through these gaps significantly reduces effective insulation.
Q5. Which insulation type expands to fill irregular spaces and also acts as an air barrier?
- A. Loose-fill fiberglass
- B. Rigid foam boards
- C. Closed-cell spray foam ✓
- D. Reflective foil radiant barrier
Why: Closed-cell spray foam expands as it cures to fill cracks and irregular cavities, creating a dense air seal. It also provides a high R-value per inch, which is why it suits tight or unusual spaces.
Module 3
Module 3: Assessing Your Home's Thermal Performance
Assessing Your Home's Thermal Performance
Knowledge check
Q1. Which tool is most commonly used to spot air leaks and cold spots in a home by detecting temperature differences on surfaces?
- A. A moisture meter
- B. An infrared thermal camera ✓
- C. A sound level meter
- D. A carbon monoxide detector
Why: An infrared thermal camera visualizes surface temperature differences, making drafts, missing insulation, and thermal bridges easy to identify.
Q2. What does R-value measure in insulation?
- A. How quickly air moves through a material
- B. A material's resistance to heat flow ✓
- C. The weight of insulation per square foot
- D. How well insulation blocks sound
Why: R-value measures thermal resistance: the higher the R-value, the better the material resists heat flow through it.
Q3. Which area of a home is typically the largest source of heat loss in winter for homes with an attic?
- A. Basement walls
- B. Windows facing north
- C. The attic or ceiling ✓
- D. The front door threshold
Why: Heat rises, and attics are often poorly insulated, so the ceiling and attic floor are usually the biggest sources of heat loss.
Q4. What is a simple way to check for air leaks around doors and windows?
- A. Tap the walls and listen for hollow sounds
- B. Hold a lit incense stick or tissue near the edges and watch for movement ✓
- C. Measure the room temperature with a thermostat
- D. Count the number of electrical outlets
Why: Smoke or a tissue will be drawn or pushed by air movement, revealing drafts around gaps in doors and windows.
Q5. What does a blower door test primarily measure?
- A. The efficiency of your furnace
- B. The total air leakage of a building envelope ✓
- C. The amount of insulation in the walls
- D. The humidity level inside the home
Why: A blower door test depressurizes the home with a fan to quantify how much air leaks through the building envelope.
Module 4
Module 4: Attic and Roof Insulation
Attic and Roof Insulation
Knowledge check
Q1. Which part of a home typically loses the most heat in winter if it is poorly insulated?
- A. Basement walls
- B. Attic and roof area ✓
- C. Interior doors
- D. Ground-floor windows only
Why: Heat rises, so warm air escapes upward through an uninsulated attic or roof. This makes the attic one of the highest-impact areas to insulate.
Q2. What does the R-value of insulation measure?
- A. How quickly insulation burns
- B. How much it resists heat flow ✓
- C. How heavy the material is
- D. How much moisture it absorbs
Why: R-value measures thermal resistance, meaning how effectively a material slows the transfer of heat. Higher R-values indicate better insulating performance.
Q3. Why is proper attic ventilation important alongside attic insulation?
- A. It increases the R-value of the insulation
- B. It helps prevent moisture buildup and ice dams ✓
- C. It makes the attic usable as a living space
- D. It reduces the need for any insulation
Why: Ventilation lets moisture escape and keeps the roof deck cool, which helps prevent condensation, mold, rot, and ice dam formation in cold climates.
Q4. Which common attic insulation type is made from fine glass fibers and is often installed as rolls or batts?
- A. Spray foam
- B. Fiberglass ✓
- C. Polystyrene board
- D. Vermiculite pellets
Why: Fiberglass is one of the most widely used insulation materials, commonly sold in rolls or batts that fit between joists. Spray foam and rigid boards are different product types.
Q5. Why should you avoid compressing insulation in the attic?
- A. Compression makes it heavier than allowed by building codes
- B. Compressed insulation loses much of its effectiveness ✓
- C. Compression causes it to release harmful fumes
- D. Compressed insulation blocks attic ventilation completely
Why: Squeezing insulation reduces the air pockets that trap heat, so its R-value drops significantly. Insulation should be laid out at its intended thickness.
Module 5
Module 5: Wall Insulation Options
Wall Insulation Options
Knowledge check
Q1. Which type of wall insulation is commonly installed by blowing loose fibers or foam into existing wall cavities without removing the wall surface?
- A. Rigid foam board on the exterior
- B. Blown-in cellulose or fiberglass ✓
- C. Spray polyurethane foam applied to the interior drywall
- D. Radiant barrier foil stapled to studs
Why: Blown-in insulation is a retrofit method that fills existing stud cavities through small holes drilled in the wall, so homeowners avoid tearing out finished walls. Cellulose and fiberglass are the most common choices for this approach.
Q2. What is the main purpose of an air barrier in a wall assembly?
- A. To add structural strength to the framing
- B. To stop unwanted air leakage through the wall, which can carry moisture and waste energy ✓
- C. To reflect radiant heat back into the room
- D. To prevent insects from entering the wall cavity
Why: Insulation alone does not stop air movement. An air barrier limits drafts and moisture-laden air from passing through the wall, which improves comfort and reduces the risk of condensation inside the assembly.
Q3. Which statement best describes the R-value of insulation?
- A. It measures how much water the insulation can absorb
- B. It measures resistance to heat flow, with higher numbers indicating better insulating performance ✓
- C. It measures the fire rating of the insulation material
- D. It measures how loudly sound travels through the wall
Why: R-value quantifies thermal resistance. A higher R-value means the material slows heat transfer more effectively, so it provides better insulation per inch of thickness.
Q4. What is a key advantage of exterior rigid foam board insulation over cavity insulation?
- A. It is always the cheapest option for every home
- B. It covers the studs, reducing thermal bridging through the framing ✓
- C. It requires no professional installation under any circumstances
- D. It eliminates the need for a vapor control layer
Why: Wood and metal studs conduct heat much faster than insulation, creating thermal bridges. Adding continuous exterior foam board wraps the framing in insulation, significantly reducing these heat paths.
Q5. Why is it important to avoid leaving gaps or compressing batt insulation in a wall cavity?
- A. Compressed insulation becomes flammable
- B. Gaps and compression reduce the effective R-value and allow air to bypass the insulation ✓
- C. Batts only work when stacked in multiple layers
- D. Gaps cause the wall to absorb more sound
Why: Batt insulation performs according to its full loft and continuous coverage. Compressing it or leaving gaps around wiring and outlets lowers the real-world R-value and creates paths for air leakage and heat loss.
Module 6
Module 6: Floor, Crawlspace and Basement Insulation
Floor, Crawlspace and Basement Insulation
Knowledge check
Q1. Which location is typically the most important area to insulate when trying to reduce heat loss through a home's lower level in a cold climate?
- A. Interior wall cavities on the top floor
- B. The floor above an unheated crawlspace or the rim joist at the top of a basement wall ✓
- C. The attic hatch door only
- D. Interior closet walls
Why: Floors above unheated crawlspaces and the rim joist (the band joist where the floor framing sits on the foundation) are major sources of air leakage and conductive heat loss in the lower level, so they are key targets for insulation.
Q2. What is the main purpose of a vapor retarder when insulating a crawlspace?
- A. To add structural strength to the floor joists
- B. To block ground moisture from entering the crawlspace and reduce humidity and mold risk ✓
- C. To provide fire resistance for the foundation
- D. To eliminate the need for any insulation
Why: Ground moisture evaporates into crawlspace air, and a ground cover or vapor retarder over the soil limits this moisture, helping prevent mold, rot, and high humidity that can damage insulation and framing.
Q3. When insulating the floor above an unheated crawlspace, which orientation is the insulation typically installed in?
- A. Pressed against the subfloor with the facing toward the living space
- B. Hanging between the joists with the facing (vapor retarder side) toward the heated area above ✓
- C. Loose on the crawlspace dirt floor
- D. Stapled to the underside of the crawlspace vents
Why: Batts or rolls are held between the joists and typically supported with wire or netting, with the kraft facing oriented toward the warm side above, so it helps control moisture moving upward from the cold, damp space below.
Q4. Why is air sealing usually done before adding insulation to a basement rim joist?
- A. Air sealing makes the insulation R-value higher than it would otherwise be
- B. Drafts through gaps can bypass insulation, so sealing stops air leakage that insulation alone cannot address ✓
- C. Insulation cannot be installed on a rim joist unless it is sealed with paint first
- D. Air sealing is only required for crawlspaces, not basements
Why: Insulation resists conductive heat flow but does not stop air movement, so cracks and gaps at the rim joist can let cold air infiltrate and warm air escape. Sealing those gaps first makes the insulation far more effective.
Q5. Which insulation material is generally considered a good choice for basement walls and rim joists because it resists moisture and can also air seal?
- A. Loose-fill cellulose installed in open cavities
- B. Closed-cell spray foam or rigid foam board ✓
- C. Uncovered fiberglass batts with no vapor control
- D. Dry leaves packed between the joists
Why: Closed-cell spray foam and rigid foam board resist moisture, provide high R-value per inch, and can seal air leaks, making them well suited to below-grade and rim joist applications. Uncovered fiberglass and loose materials are more vulnerable to moisture and air movement.
Module 7
Module 7: Air Sealing and Installation Best Practices
Air Sealing and Installation Best Practices
Knowledge check
Q1. What is the primary purpose of air sealing in a home?
- A. To increase the amount of fresh air entering the house
- B. To reduce unwanted air leakage between conditioned and unconditioned spaces ✓
- C. To make the walls more soundproof
- D. To prevent mold growth on exterior siding
Why: Air sealing targets gaps and cracks in the building envelope to reduce uncontrolled air leakage, which lowers energy loss, improves comfort, and limits moisture problems. It is distinct from ventilation, which is intentional and controlled.
Q2. Which location is typically considered one of the most important places to air seal in an attic?
- A. The center of the attic floor joists
- B. The top plates of interior walls and penetrations through the attic floor ✓
- C. The roof shingles directly above the ridge
- D. The gable vent louvers
Why: Gaps at the top plates of walls and around pipes, wires, and ducts that pass through the attic floor create major air leakage paths. Sealing these before adding insulation is a key best practice because insulation alone does not stop air movement.
Q3. Which material is best suited for sealing gaps larger than about one-quarter inch?
- A. Standard acrylic caulk
- B. Silicone caulk
- C. Expanding foam sealant ✓
- D. Painter's tape
Why: Caulk is designed for small gaps, while expanding foam fills larger openings effectively. Low-expansion foam is often recommended near windows and doors to avoid warping the frame, and all foam should be kept away from electrical boxes unless the product is rated for it.
Q4. Why should air sealing generally be completed before installing insulation?
- A. Insulation cannot be installed over any sealant
- B. Sealing is much harder to access once insulation covers the gaps, and insulation does not stop air movement ✓
- C. Insulation will absorb the sealant and lose its R-value
- D. Building codes prohibit installing insulation before sealing is inspected
Why: Once insulation is in place, the air leaks it covers become difficult or impossible to reach. Also, air moving through insulation reduces its effectiveness, so sealing the air pathways first allows the insulation to perform as designed.
Q5. What is a common and simple method for detecting air leaks in a home?
- A. Listening for the hum of the furnace
- B. Using a blower door test or holding a lit incense stick near suspected gaps to watch for smoke movement ✓
- C. Measuring the temperature of the outdoor air
- D. Counting the number of electrical outlets
Why: A blower door test depressurizes the house to reveal leaks quantitatively, while the smoke or incense method is a low-cost way to spot drafts around windows, outlets, and penetrations. Both help target sealing efforts where they will have the greatest effect.