Section E
City of Miami Beach HVHZ Electronic Roof Permit Form
Section E (Tile Calculations)
Method 1 "Moment Based Tile Calculations Per RAS 127"
For Moment based tile systems, use Method 1. Compare the values for Mr with the values from Mf. If the Mf values are
greater than or equal to the Mr values, for each area of the roof, then the tile attachment method is acceptable.
P 1: x l = - Mg: = Mr1: £ NOA Mf
P 2: x l = - Mg: = Mr2: £ NOA Mf
P 3: x l = - Mg: = Mr3: £ NOA Mf
Method 3 "Uplift Based Tile Calculations Per RAS 127"
For Uplift based tile systems use Method 3. Compare the values for F' with the values for Fr. If the F' values are greater than or equal to the Fr values, for
each area of the roof, then the tile attachment method is acceptable.
P1: × l: = × w: = - W: = × cos q: = Fr1: £ NOA F'
P2: × l: = × w: = - W: = × cos q: = Fr2: £ NOA F'
P3: × l: = × w: = - W: = × cos q: = Fr3: £ NOA F'
Where to Obtain Information to complete tile calculations
Description Symbol
Where to Find
Design Pressure P1 or P2 or P3
Table 1 RAS 127, or by an engineer analysis prepared, signed and sealed by a professional
engineer based on ASCE 7.
Mean Roof Height H
Job Site
Roof Slope
q
Job Site
Aerodynamic Multiplier
l
Product Approval (NOA)
Restoring Moment due to Gravity Mg
Product Approval (NOA)
Attachment Resistance Mf
Product Approval (NOA)
Required Moment Resistance Mr
Calculated
Minimum Attachment Resistance F'
Product Approval (NOA)
Required Uplift Resistance Fr
Calculated
Average Tile Weight W
Product Approval (NOA)
Tile Dimensions
l = length
w = width
Product Approval (NOA)
