Flat roof thermal insulation optimally, with the use of Innopan PIR thermal insulation boards
Innopan PIR thermal insulation boards have the best thermal conductivity on the market. In addition to their high compressive strength and shape retention, their water absorption is minimal due to their closed-cell structure, which ensures that the thermal insulation and load-bearing capacity of the product does not decrease even if the waterproofing is damaged. This makes them excellently suitable for thermal insulation of flat roofs.
The clear advantage of using Innopan PIR boards is that the required thermal insulation performance is achieved even with a smaller cross-section, thus resulting in material and labor savings. If the previously planned layer thickness is kept, the boards provide better thermal insulation, but at the same time, the desired heat transfer factor can be achieved with PIR thermal insulation boards applied in a thinner layer than other thermal insulation materials. In addition, due to the shape retention and high compressive strength of the entire element, they form an ideal basis for the assemblies to be placed on the roof, such as solar panels.
Value expected according to hungarian regulation U = 0,17 W/m2K
In Hungary, the heat transmission factor (U value) will be subject to new energy requirements from 2024, which were set out in Decree 7/2006. (V. 24.) regulated by TNM decree. This maximizes the U-value of flat roofs at 0.17 W/m2K. Of course, the regulation applies to newly built buildings, but it can also be a good guideline for renovations. The thermal insulation limit specified in the decree can be met with the 130 mm thick version of the Innopan PIR ALU/Therm thermal insulation board, on the other hand, if rock wool or EPS is used, a thermal insulation layer of 200-220 mm thickness would be required.
Recommended value U = 0,13 W/m2K
The decree clearly defines the minimum requirements for thermal insulation, but at the same time, with a few centimeters of extra thermal insulation material, we can take a significant step towards a more energy-efficient home. In practice, this not only has a positive effect on living comfort - as it reduces temperature fluctuations - but also saves a significant amount of energy. The maximum thermal transmittance factor recommended by Innopan is U = 0.13 W/m2K, which requires a 170 mm thick thermal insulation layer using the Innopan PIR ALU/Therm thermal insulation board. Of course, the limit value can also be met by using rock wool and EPS, but this requires 260-270 mm of thermal insulation material.
Passive house standard U = 0,10 W/m2K
A passive house is a building that is extremely energy-efficient, has low energy consumption, and provides a high level of comfort for the residents. Accordingly, the U-value of the installed thermal insulation far exceeds the standard defined by the decree. For the boundary structures of passive houses, the achievable thermal transmittance limit U = 0.10 W/m2K. In order to exceed this value, a 220 mm thick thermal insulation layer is required when using Innopan PIR ALU/Therm thermal insulation boards, while 12-14 cm thicker thermal insulation is required when using rock wool or EPS.
