By Cam Lepp
Questions asked about thermal performances of insulated roofing panel
Firstly when you consider insulated panel was originally designed (Almost 50 years ago) as a means of controlling temperature in a coldroom (50mm coldroom panel would hold 10 degrees 0% humidity inside to 35 degrees 90% humidity outside), using insulated panel for a patio roof is a “Sledge hammer of a nut cracker”.
This is largely because of the movement of air both topside & underside cooling the panel.
Even on the hottest days you will notice a huge difference in temperature under an insulated roofing panel, even the core thickness of 50mm. Exactly what that difference is will be determined by a number of factors, location, orientation, surrounding, etc.
R VALUE
When you also take into account the R values which sits at 1.38 in summer for 50mm panel you start to understand the effectiveness of these panels. It needs to be said this is a product R value and not a system R value, meaning that it will perform at that rate whether it is flat or pitched and energy in or energy out.
This puts it miles in front of any built up roof system, given your foam insulation rolls are around 1.7 system R value, but drop to around 0.25 product R value.
(R value (Resistance to heat flow)
Simply put, R-value is the measure of a material's resistance to heat flow. The higher the R-value, the better the material insulates. R-value is particularly important when considering what types of material to select for your roof since increasing the thickness of an insulating layer produces more thermal resistance.)
Note:
The Declared R-value is at 23oC in accordance with AS/NZS 4859.1:2018 & AS/NZS 4859.2:2018.
Core thickness |
| 50mm | 75mm | 100mm | 125mm | 150mm | 200mm |
Bondor® SolarSpan® or Solaris® RidgePanel® | SL Grade Declared R-value (m2K/W) at 23oC | 1.20 | 1.80 | 2.40 | 3.00 | 3.60 | 4.85 |
SL Grade Total R-value (m2K/W) at 15oC (Winter) | 1.40 | 2.03 | 2.65 | 3.27 | 3.90 | 5.15 | |
SL Grade Total R-value (m2K/W) at 30oC (Summer) | 1.38 | 1.98 | 2.57 | 3.17 | 3.76 | 4.95 | |
Bondor® Insulroof® or Solaris® CorroPanel® | SL Grade Declared R-value (m2K/W) at 23oC | 1.40 | 2.00 | 2.60 | 3.20 | 3.80 | 5.05 |
SL Grade Total R-value (m2K/W) at 15oC (Winter) | 1.61 | 2.23 | 2.85 | 3.48 | 4.10 | 5.35 | |
SL Grade Total R-value (m2K/W) at 30oC (Summer) | 1.58 | 2.17 | 2.77 | 3.36 | 3.96 | 5.14 |
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