Association of Hydraulic Services Consultants Australia – Research Foundation 
Page 2 of 10 
Contents 
1.
PURPOSE ................................................................................................................................................................... 3 
2.
METHODS ................................................................................................................................................................. 3 
3.
RESULTS ................................................................................................................................................................... 4 
3.1 
DELTAORB DPP1110 - 17.5 MM RIBS 1000MM COVER ....................................................................................... 4 
3.2 
DELTATRIM DPP1150 - 32.8 MM RIBS 1000MM COVER ...................................................................................... 6 
4.
CERTIFICATION ..................................................................................................................................................... 8 
5.
COPY OF APPENDIX D FROM AS1562.1: 2018 .................................................................................................. 9 
Disclaimer: The maximum allowable roof sheeting lengths provided in this report are based on calculations of 
theoretical hydraulic drainage capacity only. The designer and installer must provide allowances for thermal 
expansion according to AS1562.1:2018 and other relevant design codes. These may significantly reduce the 
allowable roof sheeting lengths provided in this report. The AHSCA does not guarantee the accuracy or validity 
of the calculation procedures given in AS1562.1: 2018.  

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