Delta Panels Pty.Ltd.   ABN: 11 147 861 292          A: 731 Boundary Road, Richlands, Qld 4077
P: +61 7 3271 2170     E: info@deltapanels.com    W: www.deltapanels.com    
Version Date: 
08.05.2023
12
Figure A1 - Roof Dimension Ratios
SELECT THE PATIO TYPE
•	 External Pressure - Ratio of building height(h) to least horizontal dimension(d) on plan,  
     h/d <0.5. Cpe = -0.9
•	 Internal Pressure - Non-Cyclonic - Building has no dominate openings and more than  
     one permeable wall or is effectively sealed. Cpi = +0.2
•	 Internal Pressure - Cyclonic - Based on dominate opening pressure. Cpi = +0.7
•	 Local Pressure - Least horizontal dimension on plan, <20m (a = 4m). Kl = 1.5
•	 Combination Factor - Kc =0.9
•	 Non-Cyclonic - Cfig =1.4
•	 Cyclonic - Cfig =1.85 
Figure A1

View this content as a flipbook by clicking here.