HomeMy WebLinkAboutAPPROVED Engineering AC132 ENGINEERING INC
Testing and Engineering Services
Certificate of Authorization -C.A.#8131
16821 SW 1 Street, Pembroke Pines, FL 33027
Antonio Acevedo, P.E/954-245-8976
Engineering Calculations
FLORIDA BUILDING CODE 2017
CALCULATIONS FOR ANCHOR OR BASE SHEET ATTACHMENT
BASED ON ROOFING APPLICATION STANDARD (RAS) No. 117
(New Construction/Reroof Applications)
PROJECT NAME: All Phase Roofing
This calculations is for a Flat Section of a property located at:
5312 Paleo Pines Circle, Fort Pierce,FL
Given by : All Phase Roofing
Flat Roof Section Area is :
Building with a roof mean height less than 15 feet
Base Sheet Lap 4 Inches SLOPE( Equal or Lower)
Wind Uplift Pressures from Permit Application: 1/2" in 12"
Field Area -62.5 psf
Perimeter Area -62.6 psf
Corner Area -62.5 psf
Wind Uplift Pressures from RAS No. 128 (See FBC) EXPOSURE C:
Field Area -64 psf Wind Speed 170 mph
Perimeter Area -84 psf
Corner Area -115 psf
FASTENERS BY NOA - NOA#20-0110.11 Page 26
Fasteners as per NOA spacing of
8"o.c. at the 4" lap staggered and 8"o.c. in 3 rows in the center of sheet(field).
Maximum Design Pressure by NOA: -52.5 psf
Antonio Acevedo P.E.
Fla. Reg. No: 36466
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SEP 2 1 .2020
AC132 ENGINEERING INC.
Testing and Engineering Services
CALCULATIONS FOR BASE SHEET
Given:
Width of Sheet is: 36 inches (Information by Roofer)
Side Lap Width is: 4 Inches (Information by Roofer)
A.CALCULATE WIDTH OF SHEET FOR ONE NET SQUARE(100 ft2)
1.Net Width of Sheet(ft):
Net Width(ft)_(Sheet Width)-(Side Lap Width)/12
Net Width(ft)= 2.666667 ft OR 32 inches
2. Net Length to Make One Square(100 Square Feet)
Net Length= (100 ft2)/Net Width
Net Length= 37.5 feet
B. DETERMINE THE NUMBER OF FASTENERS PER SQUARE
General Equation
(1 Fastener/A)x(12 in./ft)x((B/row)x(C/square)= D
Where
A=Specified Fastener spacing LAP 8 Inches
A2=Specified Fastener spacing (FIELD/ROW) 8 Inches
B=Net Length (in feet)to make one square 37.5 feet
C=number of rows having spacing A(LAP) 1 Rows
C2=number of rows having spacing A2 (FIELD/ROW) 3 Rows
D=number of fasteners per square
SIDE LAP ROW:
56.25 "=D" Fasteners/Square
CENTER ROW:
168.75 "=D" Fasteners/Square
Total Number of Fasteners per Square(every 100 ft2)= 225
TOTAL SQUARE FEET PER FASTENER
0.444444 Square Feet per Fastener
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ACB2 ENGINEERING INC
Testing and Engineering Services
DETERMINE THE FASTENER VALUE
Given:
Calculated Square Feet per Fastener= 0.444444 ft2/Fastener
Maximum Design Pressure From NOA -52.5 psf
GENERAL EQUATION
Fy=Fastener Value
Fy=(max design pressure)x(square feet per fasteners)
Fy= -23.3333 Ibf
DETERMINE ANCHORIBASE SHEET SPACING
TO MEET PRESSURE
GENERAL EQUATION
FS=(Fy x 144)/(P x RS)
FS= fastener spacing(inches)
Fy= fastener value(Ibf)
P= max design pressure(psf)
RS= row spacing(inches)
Note:
Row spacing(RS)is the Net Width of Sheet divided by number of rows
The Net Wdth is the width of base sheet less the side lap distance
Total Number of rows from NOA= 4 Fastener Rows
From Previous Calculations:
The net width is 32 inches
Therefore Row Spacing= 8 inches
Wind Uplift Pressures from RAS 128:Exposure C
Field Area -64 psf Wind Speed 170 mph
Perimeter Area -84 psf
Corner Area -115 psf
CONCLUSIONS/RECOMMENDATIONS
A.FASTENER SPACING FOR FIELD AREA
FS= 6.562493 inches
USE MAXIMUM 8"LAP AND 8"CENTER(Based on Product Approval)
3 rows center of sheet and 1 row in lap
B.FASTENER SPACING FOR PERIMETER AREA
FS= 4.999995 inches
USE MAXIMUM 4 INCHES SPACING(Fractions are rounded down per 2017 FBC)
Minimum 4 Feet Wide Perimeter Width-Three rows in Center of Sheet and ONE row in Lap
C.FASTENER SPACING FOR CORNER AREA
FS= .3.65217
USE MAXIMUM 41NCHES SPACING(Min.of 4"Based on Section 8.1 of RAS 117 of 2017 FBC)
Minimum 4 Feet by 4 Feet Area for Corner-Four rows in Center of Sheet and ONE row in Lap
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