HomeMy WebLinkAboutTILE CACULATION ST LUCIE YORKS
Section E (Tile Calculations)
For Moment based tile systems,choose either Method 1 or 2.Compare the values for Mr with the values from Mr. If the Mf values
are greater than or equal to the Mrvalues,for each area of the roof,then the tile attachment method is acceptable.
Method 1 'Moment Based Tile Calculations Per RAS 12T
(Zone 1: x = _)--Mg: =Mr, Product Approval M,
(Zone 2e: x = )-Mg: =M,a Product Approval Mf
(Zone 2n: x R _ _)-Mg. =Mom, Product Approval Mr
(Zone 2r: x;L = _)-Mg: Mra Product Approval Mf
(Zone 3e: x)L = _) -Mg: =M,-, Product Approval Mf,
(Zone 3r: x)L = Mg: =Mr, Product Approval Mf
Method 2"Simplified Tile Calculations Per Table Below"
Required Moment of Resistance(Mr) From Table Below Product Approval Mf 21-0420.07
Mr required Moment Resistance*
Mean Roof Height Roof Slope 15' 20' 25' 30' 40'
2:12 34.4 36.5 38.2 39.7 42.2
3:12 32.2 34.4 36.0 37.4 39.8
4:12 30.4 32.2 33.8 35.1 37.3
5:12 28.4 30.1 31.6 32.8 34.9
6:12 26.4 28.0 29.4 30.5 32.4
7:12 24.4 25.9 27.1 28.2 30.0
*Must be used in conjunction with a list of moment based tile systems
• 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.
Method 3 "Uplift Based Tile Calculations Per RAS 12T
(Zone 1: x L =x W:= )-W: cos r_ =Fri Product Approval F'
(Zone 2e: x L =x W:= )-W: cos r =Fr2e Product Approval F'
(Zone 2n: x L =x W:= )-W: cos r _=Fr2n Product Approval F'
(Zone 2r: x L =x W:= )-W: cos r_=Fr2r Product Approval F'
(Zone 3e: x L =x W:= )-W: cos r_=Fr3e Product Approval F'
(Zone 3r: x L =x W:= )-W: cos r__=Fr3r Product Approval F'
Where to Obtain Information
Description Symbol Where to find
Design Pressure Zones 1,2e,2n,2r,3e,3r From applicable table in RAS 127 or by an engineering analysis
prepared by PE based on ASCE 7
FM,anRoof Height H Job Site
Roof Slope 6 Job Site
Aerodynamic Multiplier a Product Approval
Restoring Moment due to Gravity Mg Product Approval
Attachment Resistance Mf Product Approval
Required Moment Resistance Mg Calculated
Minimum Attachment Resistance F' Product Approval
Required Uplift Resistance Fr Calculated
Average Tile Weight W Product Approval
Tile Dimensions L=length W=width Product Approval
All calculations must be submitted to the building official at the time of permit application.