3315 BROADWAY HOPEWORKS STATION 2 2020-12-02

U-BUILDER PRODUCT ASSUMPTIONS RM5- Ballasted Flat Roof Systems Limitations of Responsibility:It is the user's responsibility to ensure that inputs are correct for your specific project. 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. Duildina Assumptions 1.Building and System Risk Category II 2.Building Height<_60 ft. 3.Roof Slope>_2.4°(1/2:12)and<5.6°(1-3/16:12) 4.Friction Tested Roofing Types:EDPM,PVC,TPO,and Mineral Cap 5.Required Setback from Module Edge to Building Edge for Wind Tunnel:3 ft(See Item 14) 6.Surrounding Building Grade:Level 7.Wind Design:Basic Wind Speed Range is 110-170 mph(ASCE 7-10).Wind Exposure:B or C(ASCE 7-10).Occupancy/Risk Category II buildings and systems with a 25 year design life.Insertion of the project at-grade elevation can result in a reduction of wind pressure.If your project is in a special case study region or in an area where wind studies have been performed,please verify with your jurisdiction to ensure that elevation effects have not already been factored into the wind speed.If elevation effects have been included in your wind speed,please select 0 ft. 8.Ground Snow Load(ASCE 7-10):0-60 psf.Results are based on uniform snow loading and do not consider unbalanced,drifting,and sliding conditions.Roof snow load reduction calculated per Section 7.3 of ASCE 7 with the following assumptions:Exposure factor=0.9, Thermal factor=1.2. 9.RM5 Bay Weight:-7.2 lbs 10.Module Gaps(EMI)=0.25 in 11.Seismic:Installations must be in seismic site class A,B,C,or D as defined in ASCE 7-10. 12.Ballast Calculations are based on ASCE 7-10 load combinations and product specific wind tunnel testing. 13.Ballast Blocks:The installer is responsible for procuring the ballast blocks(Concrete Masonry Units-CMU)and verifying the required minimum weight needed for this design.CMU to comply with ASTM standard specification for concrete roof pavers designation C1491 or C90 with an integral water repellant 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 block is observed,the block should immediately be replaced.The CMU ballast block should have nominal dimensions of 4"x8"x16".The actual block dimensions are 3/8"less than nominal dimensions.Ballast blocks should have weight as specified for the project in the"Inspection"section of this report. 14.Wind deflectors on the east and west edges of the array should overhang the east and west modules by six inches for Type I modules on the north rows only.Wind deflectors on the east and west edges of the array should overhang the east and west modules by six inches for Type II modules on the north row and east and west edge columns. 15.Limitations of Responsibility:It is the users responsibility to ensure that inputs are correct for your specific project.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. 16.The system is certified to UL2703 when properly installed.See the installation guide for more detail. $allast Blocks The installer is responsible for procuring the ballast blocks (Concrete Masonry Units-CMU)and verifying the required minimum weight needed for this design. CMU should comply with ASM standard specification for concrete roof pavers designation (C1491 or C90 with an integral water repellant 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 block is observed,the block should immediately be replaced.The CMU ballast block should have nominal dimensions of 4"x8"x16".The actual block dimensions are 3/8"less than the nominal dimensions.Ballast blocks should have a weight as specified for the project in the"Inspection"section of this report. Desian Parameters 1.Importance Factor:Array(Ip)=1.0,Building(le)=1.0 2.Site Class=D 3.S=design seismic displacement of the array relative to the roof 4.Minimum Separation:Array to Array=0.5°S,Array to Roof Edge or Obstruction with Qualified Parapet=1.0*S,Array to Roof Edge with Unqualified Parapet=1.5*S 5.Ss=mapped MCER,5 percent damped,spectral response acceleration parameter at short periods per ASCE 7-10 6.SDS=design,5 percent damped spectral acceleration parameter at short periods per ASCE 7-10 7.Coefficient of friction used for calculations per Unirac,Inc.Roof Mount Ballast Support Coefficient of Friction Testing report dated 7/13/2016. Properties 1.Bay Weight:-7.2 lbs