Final answer:
The question asks for the calculation of the rate of heat flow through a well-built exterior wall composed of drywall, fiberglass batts, and insulated siding as well as a more realistic scenario including wooden studs. Thermal conductivity and R factors of materials are used in the calculation.
Step-by-step explanation:
The question posed relates to the study of physics, specifically the concept of thermal conductivity and heat transfer through walls. The problem is a two-part Physics question that involves calculating the rate of heat flow through a wall with given materials and dimensions.
The first part of the question (a) deals with an idealized wall without any wooden studs, while the second part (b) takes into account the presence of 2-by-4 wooden studs spaced 16 inches apart. In both scenarios, the temperature difference between the inside and the outside of the wall is given, and the total rate of heat flow through the wall needs to be calculated using the combined R factor of the layers of the wall.
The type of drywall required by building code on the outer surface of walls separating an attached garage from the house is fire-rated drywall. Fire-rated drywall, also known as Type X or Type C drywall, is designed to provide enhanced fire resistance.
Fire-rated drywall is made with gypsum and reinforced with additional fibers and additives to slow down the spread of fire. It can withstand high temperatures for a longer period, giving occupants more time to escape.
The use of fire-rated drywall in these walls helps to protect the house from potential fires originating in the garage.