Association of Hydraulic Services Consultants Australia – Research Foundation 
Page 3 of 10 
1. Purpose 
The purpose of this report was to determine the roof drainage capacities of two different Delta 
Panels Roof Sheeting profiles (DeltaOrb and DeltaTrim) according to calculation procedures 
outlined in Section 3.3 of AS1562.1:2018 – Design and Installation of sheet roof and wall 
cladding.  
2. Methods 
Calculation procedures outlined in Section 3.3 of AS1562.1:2018 were followed to determine 
the drainage capacities of the two Delta Panels Roof Sheeting profiles. These procedures 
are: 
3.3.1 General: 
The cladding system shall provide water resistance and drainage when subjected to a rainfall 
resulting from a storm having an average recurrence interval of 100 years as determined by 
AS3500.3 (i.e. 100year, 5-minute duration storm).  
3.3.2 Roof Pitch 
Minimum roof pitch shall be the greater of: 
a) The value given in Table 3.1: and
b) The value calculated in accordance with Appendix D (see appendix).
The drainage capacity calculation results presented in this report were obtained using the 
procedures outlined in Appendix D of AS1562.1:2018. Maximum allowable roof lengths* for 
the 100 year, 5-minute storm rainfall intensities are presented for roof pitch values equal to 
and greater than the minimum values given in Table 3.1.  
*The designer and installer must provide allowances for thermal expansion according to AS1562.1:2018 and
other relevant design codes.

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