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RM10 U-BUILDER PRODUCT ASSUMPTIONS <br />RM10 – 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 <br />project. <br />Building Assumptions <br />1.Risk Category III <br />2. Building Height ≤ 50 ft <br />3. Building Height > 50 ft: only where (longest length of building x building height)^0.5 ≤ 100 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 <br />B (provided 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 <br />needed for this design. CMU should comply with ASM standard specification for concrete roof pavers designation (C1491 or C90 with an <br />integral water repellent suitable for the climate it is placed. It is recommended that the blocks are inspected periodically for any signs of <br />degradation. If degradation of the block is observed, the block should immediately be replaced. <br />The CMU ballast block should have nominal dimensions of 4”x8”x16”. The actual block dimensions are 3/8” 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 III <br />2. Wind Design <br />a. Basic Wind Speed: 85-120 mph (ASCE 7-05)/110-150 mph (ASCE 7-10)/90-180 mph (ASCE 7-16) <br />b. Exposure: B, C or D (ASCE 7-05/ASCE 7-10) <br />c. 25 year Design Life/50 year Design Life for ASCE 7-16 <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 <br />case study region or in an area where wind studies have been performed, please verify with your jurisdiction to ensure that <br />elevation effects have not already been factored into the wind speed. If elevation effects have been included in your wind <br />speed, please select 0 ft as the project 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 psf (ASCE 7-10/ASCE 7-16) <br />b. Exposure Factor: 0.9 <br />c. Thermal Factor: 1.2 <br />d. Roof Snow Load: Calculation per Section 7.3 (ASCE 7-05/ASCE 7-10/ASCE 7-16) <br />e. Unbalanced/Drifting/Sliding: Results are based on the uniform snow loading and do not consider unbalanced, drifting, and <br />sliding conditions <br />4. Seismic Design <br />a. Report SEAOC PV1-2012/ASCE 7-16 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 7-05/ASCE 7-10/ASCE 7-16) <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. Bay Weight: ~3.5 lbs <br />2. Module Gaps (E/W) = 0.25 in <br />3. Bays: North row bays overhang the module by ~19.5 inches. <br />Module Properties <br />1. Module return flange: Minimum of 0.9in (when using 1-3/4 in. clip bolts) is required. <br />2. Module return flange: Minimum of 0.65in (when using 2 in. clip bolts) is required. <br />1417 S Broadway <br />9/19/2024