October 08, 2024 
 
© 2024 Acronem Consulting Australia Pty Ltd. All rights reserved. 
Page 2 of 2 
 
Summary tables of calculations of Total R-value of Delta Panels Phenolic Foam 
Composite (TPC) Panels for; External Roof; External Wall; and, Internal Wall 
construction performed in accordance with AS/NZS 4859.1:2018 are provided below. 
In all cases the construction is assumed to consist of the panel.  
The contribution of R-value for the external and internal non-reflective air films have 
been added to the R-value contribution of the panel incorporating the effects of mean 
temperature for Australian conditions: 
-        Heat flow out (Winter): Indoors 18°C, outdoors 12°C, mean 15°C 
-        Heat flow in (Summer): Indoors 24°C, outdoors 36°C, mean 30°C 
Contribution of Air-film resistances [(m2.K)/W] 
  
Roof 
External Wall 
Internal Wall 
  
Wint. 
Sum. 
Wint. 
Sum. 
Wint. 
Sum. 
Outside Air Film 
0.04 
0.04 
0.04 
0.04 
0.12 
0.12 
Inside Air Film 
0.11 
0.16 
0.12 
0.12 
0.12 
0.12 
 
Table 2: - 
Delta Panels Phenolic Foam Composite (TPC) Panels  
                    Total R-value - External Roof, External Wall & Internal Wall 
Australia 
Total R-value [(m2.K)/W] (Summer/Winter) & System U-value W/m2K (Summer/Winter) 
TPC 
Thickness 
(mm) 
50 
60 
70 
75 
80 
90 
100 
110 
125 
150 
175 
200 
Roof 
R(Sum.) 
1.45 
1.70 
1.95 
2.05 
2.20 
2.40 
2.65 
2.95 
3.30 
3.90 
4.60 
5.20 
U(Sum.) 
0.69 
0.59 
0.51 
0.49 
0.45 
0.42 
0.38 
0.34 
0.30 
0.26 
0.22 
0.19 
R(Wint.) 
1.45 
1.70 
2.00 
2.10 
2.25 
2.50 
2.75 
3.05 
3.40 
4.05 
4.75 
5.40 
U(Wint.) 
0.69 
0.59 
0.50 
0.48 
0.44 
0.40 
0.36 
0.33 
0.29 
0.25 
0.21 
0.19 
Ext Wall 
R(Sum.) 
1.41 
1.66 
1.91 
2.01 
2.16 
2.36 
2.61 
2.91 
3.26 
3.86 
4.56 
5.16 
U(Sum.) 
0.71 
0.60 
0.52 
0.50 
0.46 
0.42 
0.38 
0.34 
0.31 
0.26 
0.22 
0.19 
R(Wint.) 
1.46 
1.71 
2.01 
2.11 
2.26 
2.51 
2.76 
3.06 
3.41 
4.06 
4.76 
5.41 
U(Wint.) 
0.68 
0.58 
0.50 
0.47 
0.44 
0.40 
0.36 
0.33 
0.29 
0.25 
0.21 
0.18 
Internal 
Wall 
R(Sum.) 
1.49 
1.74 
1.99 
2.09 
2.24 
2.44 
2.69 
2.99 
3.34 
3.94 
4.64 
5.24 
U(Sum.) 
0.67 
0.57 
0.50 
0.48 
0.45 
0.41 
0.37 
0.33 
0.30 
0.25 
0.22 
0.19 
R(Wint.) 
1.54 
1.79 
2.09 
2.19 
2.34 
2.59 
2.84 
3.14 
3.49 
4.14 
4.84 
5.49 
U(Wint.) 
0.65 
0.56 
0.48 
0.46 
0.43 
0.39 
0.35 
0.32 
0.29 
0.24 
0.21 
0.18 
 
Faithfully, 
 
 
 
Cameron Chick BE(Hons), Ph.D., GC.Com.(Mktg), M.AIRAH, RPEQ 
Registered Professional Engineer - Qld. (Structural): 15370, Vic. (Civil): PE0000967 
for and on behalf of – Acronem Consulting Australia Pty Ltd  
 

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