Association of Hydraulic Services Consultants Australia – Research Foundation 
Page 8 of 10 
4. Certification 
I hereby certify that the roof drainage capacity calculation results presented in this report was 
carried out in accordance with AS1562.1:2018 and AHSCA Research Foundation protocols. 
A/Professor Terry Lucke - Research Corodinator 
PhD, FIEAust CPEng EngExec NER APEC Engineer IntPE(Aus) 
Mark Alexander, 
AHSCA Foundation Chairman: 
Date: 20th August 2020 
Date: 20th August 2020 
*Disclaimer:
•
Calculations were performed using dimensions obtained from AutoCAD drawings provided to
the AHSCA by Delta Panels Pty Ltd for this purpose. No measurements of actual roof sheeting
products were performed for this report.
•
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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