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RMDT U-BUILDER PRODUCT ASSUMPTIONS <br />RMDT – Ballasted Flat Roof Systems <br />Limitations of Responsibility: It is the user’s responsibility to ensure that inputs are correct for your specific project. <br />Unirac is not the solar, electrical, or building engineer of record and is not responsible for the solar, electrical, or building design for this project. <br />Building Assumptions <br />1. Risk Category I - IV <br />2. Building Height ≤ 100.00 ft <br />3. Building Height > 50.00 ft: only where (longest length of building x building height)^0.5 ≤ 100.00 ft <br />4. Roof Slope ≥ 0° (0:12) and ≤ 3° (5/8:12) for Seismic Design Category C, D, E and F. For low seismic regions Seismic Design Category A and B (provided <br />Array Importance factor = 1.0), Roof Slope ≥ 0° (0:12) and ≤ 7° (1 1/2:12). <br />5. Roofing Material Types: EDPM, PVC, TPO, or Mineral Cap <br />6. Surrounding Building Grade: Level <br />Ballast Blocks <br />The installer is responsible for procuring the ballast blocks (Concrete Masonry Units – CMU) and verifying the required minimum weight needed for <br />this design. CMU should comply with ASM standard specification for concrete roof pavers designation (C1491 or C90 with an integral water repellant <br />suitable for the climate it is placed. It is recommended that the blocks are inspected periodically for any signs of degradation. If degradation of the <br />block is observed, the block should immediately be replaced. <br />The CMU ballast block should have nominal dimensions of 4.00" x 8.00" x 16.00". The actual block dimensions are 0.37" less than the nominal <br />dimensions. Ballast blocks should have a weight as specified for the project in the “Inspection” section of this report. <br />Design Parameters <br />1. Risk Category I to IV <br />2. Wind Design <br />a. Basic Wind Speed: 110.00 mph - 150.00 mph (ASCE 7-10)/90.00 mph - 180.00 mph (ASCE 7-16/ASCE 7-22) <br />b. Exposure: B or C (ASCE 7-10/ASCE 7-16/ASCE 7-22) <br />c. 25 year Design Life/50 year Design Life for ASCE 7-16/ASCE 7-22 <br />d. Elevation: Insertion of the project at - grade elevation can result in a reduction of wind pressure. If your project is in a special case study <br />region or in an area where wind studies have been performed, please verify with your jurisdiction to ensure that elevation effects have not <br />already been factored into the wind speed. If elevation effects have been included in your wind speed, please select 0.00 ft as the project <br />site elevation. <br />e. Wind Tunnel Testing: Wind tunnel testing coefficients have been utilized for design of the system. <br />3. Snow Design <br />a. Ground Snow Load: 0 - 80.00 psf(ASCE 7-10/ASCE 7-16/ASCE 7-22) <br />b. Exposure Factor: 0.9 <br />c. Thermal Factor: 1.2 <br />d. Roof Snow Load: Calculation per Section 7.3 (ASCE 7-10/ASCE 7-16/ASCE 7-22) <br />e. Unbalanced/Drifting/Sliding: Results are based on the uniform snow loading and do not consider unbalanced, drifting, and sliding <br />conditions <br />4. Seismic Design <br />a. Report SEAOC PV1-2012/ASCE 7-16/ASCE 7-22 SECTION 13.6.12 – Structural Seismic Requirements and Commentary for Rooftop Solar <br />Photovoltaic Arrays <br />b. Seismic Site Class: A, B, C, or D (ASCE 7-10/ASCE 7-16/ASCE 7-22) <br />c. Importance Factor Array (lp): 1.0 <br />d. Importance Factor Building (le): 1.0 <br />e. Site Class: D <br />Properties <br />1. Ridge Bay Weight: 7.70 lbs <br />2. Valley Bay Weight: 5.60 lbs <br />3. Module Gaps (N/S) = 0.25" <br />4. Bays: East and west column bays overhang the module by ~7.90". <br />Testing <br />1. Coefficient of Friction <br />2. Wind Tunnel <br />3. UL 2703 <br />4. Component Testing (Bay and Clamp) <br />Page 42 of 43