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The standardized levels of finish in the gypsum wall industry refer, among other things, to the:

A. Quality of workmanship of the final finish.
B. Number of coats of joint compound used.
C. Thickness of joint compound.
D. Type of texturizing used.

Answer :

Final answer:

The standardized levels of finish in the gyp wall industry refer to the quality of workmanship of the final finish. For heat flow calculations, the formula Q = δT/R is used, where R-factors of different layers are added in series for a simple wall and modified to account for thermal bridging in a wall with studs.

Explanation:

The standardized levels of finish in the gypsum wallboard (gyp wall) industry specifically refer to the quality of workmanship of the final finish. This includes several factors encompassed by different levels specifying the degree of finish applied to the gypsum board, ranging from the bare necessities required for concealment of joints to finishes ready for high gloss paints or other final treatments.

Heat Flow Through Wall Calculation? Part (a): To calculate the rate of heat flow through the wall, one can use the formula for heat transfer "Q = δT/R", where "Q" is the heat transfer per time ("heat current"), δT is the temperature difference across the wall, and "R" is the total resistance to heat flow of the wall assembly.

With R-factors given for drywall and siding, together with the fiberglass batts' contribution, the total R-factor is calculated through series addition. Remembering to convert the thickness of the fiberglass to feet and using the appropriate R-value for fiberglass, one can find the total resistance and then calculate Q.

Part (b): Considering the presence of wood studs within the insulation changes the overall R-value of the wall. The calculation becomes more complex as one would have to account for the thermal bridging caused by the studs, typically resulting in a lower total R-value and hence a higher rate of heat loss.

The area attributed to the studs must be estimated and considered along with the area of insulation when determining the overall R-value for this more realistic scenario.

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