Sealant joint and heat loss calculations

This assignment is based on a rectangular, brick-clad, 2-story building with a low-slope (essentially "flat") roof. The plan dimensions of the building are 60 feet x 120 feet, and the building height from grade is 24 feet. Vertical sealant joints in the brick veneer are spaced at the column lines, every 30 feet; there are no horizontal sealant joints. Use these dimensions in the calculations that follow.

Part I: Sealant joint calculation

Calculate the required width of a typical vertical sealant joint, assuming the following: sealant movement capability of 50%; coefficient of thermal expansion of brick = 0.0000036; temperature range from -15 degrees F to 105 degrees F; installation temperature range from 60 to 75 degrees F; moisture expansion coefficient of brick = 0.0002; maximum structural movement (due to wind or seismic forces) of 1/4"; construction tolerance = 1/8 inch. Round answer to nearest 1/8".

Remember to find the "worst-case" situation, either for maximum joint contraction or maximum joint expansion.

Part II: Heat loss calculation

Calculate the (winter) heat loss from the building in BTU/hour units, using an indoor temperature of 70 degrees F and an outdoor temperature of -15 degrees F. Assume the following:

Window/door area is 25% of the total cladding surface (assume U-value for insulated, low-E windows/doors of 0.3)
For non-window/door wall surfaces, assume R-values for the typical wall section as follows: drywall=0.45; CMU=1.11; insulation=8.0; air space=1.0; brick=0.44; neglect air film contribution.
For roof surface, assume 4"-average thickness of rigid insulation with R=16 and drywall ceiling with R=0.45.
Neglect heat loss through the insulated slab-on-grade.

Provide the results in two parts:
A) The contribution to the total heat loss from

windows/doors;
other exterior wall surfaces;
roof;

B) The total heat loss (by adding the three component parts calculated in part "A").

Format

Submit on 8-1/1" x 11" paper. Show calculations in a neat, orderly, and clear format (in other words, do not simply submit your initial worksheet).

Academic Integrity

"Course Assignments. Students are encouraged to discuss the content of a course among themselves and to help each other to master it, but no student should receive help in doing a course assignment that is meant to test what he or she can do without help from others."

From the "Code of Academic Integrity," Policy Notebook for Cornell Community, Aug. 1998-99, p.78