CPR CPR Building Science & Construction Materials

Question 1

What type of insulation is most commonly found in wall cavities of wood-frame residential construction and is particularly susceptible to moisture retention after a water loss?

Accepted Answer

Fiberglass batt insulation

Answer

Spray polyurethane foam (SPF)

Answer

Rigid foam board insulation

Answer

Mineral wool insulation

Question 2

In wood-frame construction, what is the term for the horizontal framing member that sits on top of the foundation wall and supports floor joists?

Accepted Answer

Mudsill (sill plate)

Answer

Ridge board

Answer

Rim joist

Answer

Header

Question 3

Which type of flooring substrate, commonly used under tile, is highly resistant to moisture damage and preferred in wet areas?

Accepted Answer

Cementboard (cement backer board)

Answer

OSB (oriented strand board)

Answer

Standard drywall backer

Answer

Particleboard

Question 4

What is the R-value of a building material and why is it relevant to restoration contractors?

Accepted Answer

The material's resistance to heat flow (thermal resistance); relevant when replacing insulation after water damage

Answer

The material's resistance to fire spread; relevant for fire restoration scoping

Answer

The material's reaction to mold growth; relevant for remediation decisions

Answer

The material's rigidity under structural load; relevant for structural drying

Question 5

In a typical residential home, what is the purpose of a vapor retarder installed in an exterior wall assembly?

Accepted Answer

To control the diffusion of water vapor through the wall assembly and prevent interstitial condensation

Answer

To improve structural rigidity of the wall

Answer

To provide a fire-resistant barrier between framing and interior finishes

Answer

To seal air gaps and reduce pest intrusion

Question 6

Why is oriented strand board (OSB) considered more vulnerable to water damage than plywood in structural applications?

Accepted Answer

OSB swells and delaminates more readily when wetted and dries more slowly than plywood due to its compressed edge structure

Answer

OSB contains higher levels of formaldehyde that react with moisture

Answer

OSB is thinner than plywood and structurally weaker when wet

Answer

OSB lacks the resin bonding found in plywood and dissolves in water