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NCARB PDD Exam - Topic 1 Question 1 Discussion
Topic #: 1
A family-owned apple farm in the Upper Midwest is taking advantage of a change in the local zoning code that added a new Agri-Tourism class in the existing farm zone. This allows the Owner to build a new facility on their existing site. The building will be open to the public and include a brewery, distillery, tap room, and market. The architect is ready to submit the drawings to the Owner for the 50% construction documents review.
To accommodate a compressed construction schedule, the Owner will be utilizing a design-build process. The Contractor has submitted the Pre-Engineered Metal Building (PEMB) shop drawings to the Architect for review, due to the lead time on this critical path item. Once construction begins, farming operations must be able to continue uninterrupted.
Key project information includes:
Brewing and distilling will operate year-round.
Brewery will initially include four fermenting tanks. Owner has requested space for at least two additional tanks. Potential expansion will be based on future sales.
Distillery will produce 16% alcohol, which is classified as a flammable liquid. Fire separations are required.
Tap Room is designed with seating for 300 people, not including exterior patio seating. It will have views to the working orchards and the historic buildings on site.
Tap Room is scheduled to be open from August through November. Owner would like options to extend operating dates based on popularity.
The Market area will feature local farm products and is not conditioned.
Entire building will be fully sprinklered.
Selected building materials are low-maintenance, as requested by the Owner, for durability and to reflect the nature of a working farm.
Mechanical and electrical systems will be hung from the building structure. These loads are included in PEMB shop drawings.
Public water and sewer is not available at the Project Site.
Occupancy sensors are included to reduce utility costs and achieve energy conservation requirements.
The following resources are available for your reference:
Architectural Drawings, including plans, elevations, sections, and schedules
Consultant Drawings, including structural, HVAC, power distribution, and plumbing
PEMB Shop Drawings
Design and Construction Schedule
Specification Excerpts, showing relevant spec sections
IBC and ADA Excerpts, showing relevant code and accessibility sections
After reviewing the documents, the architect discovers a coordination issue in the corridor.
The owner is concerned about elevated noise levels in the Tap Room when fully occupied. The current design utilizes a 2 x 2 acoustic ceiling tile system installed above the fans. An acoustical engineer recommends noise mitigation through limiting reverberation time (RT) to 2.0 seconds or less in the space. This can be achieved by the provided ceiling material options and their corresponding area.
What should the architect recommend that will minimize additional project costs while providing the recommended acoustical solution?
1. Problem Summary
Goal: Reduce reverberation time (RT) in the Tap Room to 2.0 seconds or less.
Current design: 2' x 2' acoustic ceiling tile system (RT = 2.0 seconds) installed above fans.
Constraint: Minimize additional project cost.
Recommendation from acoustical engineer: Use materials to achieve target RT without redesigning the space.
2. Review of Table Data
Material RT SF SF Cost
Cementitious Wood Fiber Panels (1') 2.0 448 $12.64
Cementitious Wood Fiber Panels (2') 1.8 384 $18.95
2x2 Acoustical Ceiling Tile (15/16') 2.0 900 $8.81
Acoustical Sound Board (1') 1.6 256 $18.23
3. Interpretation of RT Values
Current 2x2 Acoustic Ceiling Tile: RT = 2.0 seconds meets the target exactly.
However, fans may reduce the acoustic performance by reflecting or scattering sound, so supplemental absorption may be needed.
Adding Acoustical Sound Board (RT = 1.6) above the existing tile system will improve absorption and lower RT below 2.0 seconds.
4. Cost & Constructability
Retaining the current ceiling layout and simply adding a layer above is:
Least disruptive to current design.
Avoids redesign of the ceiling cloud layout.
Minimizes schedule impact (critical for design-build with compressed schedule).
Replacing with wood fiber panels (1' or 2') would require removal of existing tile, redesign of suspension, and higher cost/SF.
5. Why Other Options Are Incorrect
A . Remove fans: This addresses air movement, not RT. Removing them does not guarantee RT improvement and conflicts with HVAC design intent.
B . One cloud + 1' wood fiber panels: Reduces coverage area and may not meet RT goal; also costly and disruptive.
C . One cloud + 2' wood fiber panels: Even more costly, same redesign problem as B.
D . Retain tiles and add sound board above: Achieves RT < 2.0, minimal disruption, cost-effective vs. full replacement best option.
6. NCARB ARE 5.0 PDD Study Guide Reference
Content Area: Building Systems Integration --- Acoustics
Reference Sources:
Architectural Graphic Standards --- Acoustic material properties
Mechanical and Electrical Equipment for Buildings (MEEB) --- Room acoustics and reverberation control
ASTM C423 --- Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
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