Association of Hydraulic Services Consultants Australia – Research Foundation 
Page 6 of 10 
3.2 DeltaTrim DPP1150 - 32.8 mm Ribs 1000mm Cover 
DeltaTrim DPP1150 roof sheeting (Figure 3) is classified as trapezoidal sheeting with ribs 
between 20 and 35mm in Table 3.1 (AS1562.1). Therefore, the minimum allowable pitch for 
this roof profile is 2.0º. Maximum roof lengths are shown in Table 4 and Figure 4. 
Figure 3 – DeltaTrim DPP1150 Roof Sheeting 
Table 3 - DeltaTrim DPP1150 roofing profile variables used for calculations 
m 
D 
hol 
w' 
w'/D > 2.5? 
Use Eqn. 
D1 or D2? 
dm
(0.75*hol) 
w 
a' 
250mm 32.8mm 16.9mm 206mm 
12.2 
D2 
12.7mm 
201mm 2420mm2 
Table 4 - DeltaTrim DPP1150 Maximum Roof Lengths for Rainfall Intensities 
Maximum Roof Length (m)* 
100I5 
ARI    
(mm/h) 
Pitch    
2° 
Pitch    
3° 
Pitch    
4° 
Pitch    
5° 
Pitch    
7.5° 
Pitch    
10° 
100 
126 
146 
164 
180 
214 
244 
150 
84 
98 
109 
120 
143 
163 
200 
63 
73 
82 
90 
107 
122 
250 
50 
59 
66 
72 
86 
98 
300 
42 
49 
55 
60 
71 
81 
350 
36 
42 
47 
51 
61 
70 
400 
32 
37 
41 
45 
54 
61 
450 
28 
33 
36 
40 
48 
54 
500 
25 
29 
33 
36 
43 
49 
*The designer and installer must provide allowances for thermal expansion according to AS1562.1:2018 and
other relevant design codes.
w' = 206mm
D/2 = 16.4mm
hol=
Dm=
w = 201mm
m = 250mm
D = 32.8mm
Area = 2420 mm2
16.9
12.7

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