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HomeMy WebLinkAboutRoof Antennas - Roof Capcity Letter & Attachment Rev 1-PE StampWieder engineering, Jnc 11718 SE Federal Hwy.. #373 Hobe Sound, FL 33455 (772)546-5823 Cell: (772) 618-3437 Fax: (772) 545-3734 E-mail: awieder@wiederengineering.com September 30, 2020 Brent Wood Brent A. Wood Architecture 20 SE Ocean Blvd. Stuart, FL 34994 Subject: Ballasted Satallite Dishes Re: Roof Capacity To whom it may concern: Wieder Engineering, Inc was requested to review the existing roof structure for the loading from ballasted antenna stand. The attached signed and sealed calculations provided by Baird Mounting Systems indicates the loading is 24.16 PSF average. Based on the existing roofing system being a maximum of 3" ridged board insulation and a 4 ply built-up roofing, the existing roof structure can carry the weight of the proposed antennas, antenna stands and ballast indicated in the Baird Mounting System calculations. Please contact Wieder Engineering, Inc should you have any questions. F L 43444 Inc E.SWork1U's%United Teleports - Brent Wo ffiRoof Antennas - Roof Gapeity Letter Rev 1 _wpd 9!8!2020 SES - Viasat VM240 Ka - Port St. Lucie, FL, LSSA - 91812020, 5:24:21 AM Your Ballast Calculator Results The recommended ballast weight and mounting system for the Viasat VM240 Ka would be: PL -2 KA -BALD (3 TRAYS), 6.62" O.D. (S84) X 4' MAST W/ PAD Part #PL2KA-T-6628X4-R 4,857.7 pound ballast required to resist sliding and overturning 24.2 PSF roof loading (weight of product, mount and ballast / mount area) Calculator Criteria t Date Prepared c�a Make/ Model City Building Height Roof Type Wind Exposure Wind Speed cQ 2020 BAIRD MOUNTING September 8, 2020 Viasat VM240 Ka Port St. Lucie, FL, USA 28 feet Rubber Membrane D - Flat 158 mph If you are interested in white 11TENITEX PHONE I i'_ FAX FL COA 30276 Vertex Job No. 66422 tiy�►Il1i111,,/ No. 79782 . 2 STATE OF Q Richard Klein 0 2020.09.09 06:3Q:18 Q6`00AL ' r1"1111111145`��+, Visit at www.bbairdmounts.com wind speed: 158.45604716529303 Antenna requires specific mounts Candidate mounts for seller Baird PL -2 KA --BAND (3 TRAM'S), 6.62" O.D. (S80) X 4' MAST W/ PAD Determining if mount: 'PL2KA-T-6628X4-R' is compatible... velocity pressure coefficient calculation: 2.01 * ((28.0 / 700) ' (2.0 / 11.5)) pressure- coefficient pressure coefficient: 1.15 velocity pressure calculation: 0.00256 * 1.15 * 1.0 * 1.0 (158.45604716529303 - 2) velocity_ pressure: 73.81 wind force calculation: 73.81 * 0.85 * 1.8 * 48.7 * 0.6 wind force: 3299.93 untethered_ required -ballast -weight calculation: ((3299.93 / 0.7) 1.25) - (735.0 + 300.0) untethered_ required -ballast -weight: 4857.74 roof load calculation: (4857.74 + 735.0 + 300.0) / 243.9 roof load: 2 4.16 .tet - untethered result: { pressure: 24.2, ballast weight: 4857.7 } tethered_ required_ ballast weight calculation. ((3299.93 * 1.5 (6.225 + 1.0)) / 7.81) - (735.0 + 300.0) tethered_ required -ballast -weight: 3544.13 roof load calculation: (3544.13 + 735.0 + 300.0) / 243.9 roof load: 18.77 tethered result: { pressure: 18.8, ballast weight: 3544.1 } Candidate mount: max _roof_load: 25.0, minimum -ballast -weight: 1700.0 Compatible calculation: 24.2 <= 25.0 Compatible mount found: 'PL2KA-T-6628X4-R' .... _ -_;1 W 2C1h Are, Suite 100-Q 1;enrer, CG BO?78 PHONE :403 62191161 PAX 303623.9116 FL CdA 30276 Vertex Job Pio. 66022 j111111111111j.1 6 U TtF No. 79782 Z STATE OF ' Richard Kieiry'. 0�`'�`�14�: 2020.09.09 �'f� `�. 06:31:02-06'00' ONA `rGr`,�`�� le 04 C LU W C C W ci OD a 10 n — 0 O -a X O Z a IL N4 CL N N �e e N � O O X OD LU J I m � LU Q� W �J v F- F- 0 7 z O Z °o P Q M �wz< ID EK F- 0 < d LIJ It J Cl gn Q Q V) m NZ N 04 Q t a r z 00 z 4 ❑�� � zOO�N s Z� u= FOzm z t ¢ w =fl-�ioow d zd s� zp�� �zarz w a d v Sn-Z-3 0 U vi r 7 5E d EIC m J ••� � �i[.Ev o 2 s (V GoLLI LL Q-•. © •: =S T _ -W R ~_ 0: C� :: {J 4( . _� Www w "Iti*1II%"" X OD LU J I m � LU Q� W �J v F- F- 0 7 z O Z °o P Q M �wz< ID EK F- 0 < d LIJ It J Cl gn Q Q V) m NZ N 04 Q t a r z 00 z 4 ❑�� � zOO�N s Z� u= FOzm z t ¢ w =fl-�ioow d zd s� zp�� �zarz w a d v Sn-Z-3 0 U vi r 7 5E d EIC m c E @ E LO \\ bI / k/k ±nA 4n / 2 � 0 0\\{ 0 2±g3 ƒ zona < o <0 £kEe % � < g % © _C-4\ EE»