Our RIB-ROOF metal roofing systems minimise thermal bridges, ensuring compliance with the Building Energy Efficiency Act (GEG) without costly additional measures. The requirements for thermal insulation had already risen significantly with the introduction of the Energy Efficiency Ordinance (EnEV), which was replaced by the GEG. Therefore, we have revisited the topic of thermal bridging effects with the roof build-ups that we recommend.
FIW Forschungsinstitut für Wärmeschutz e.V. Munich recently conducted a study on the thermal bridge effect of various fastemomgs for light metal roofs by means of two- and three-dimensional numerical simulations. The findings confirm that our RIB-ROOF metal roofing systems exhibit optimum U-values for all common insulation thicknesses. This not only means that a RIB-ROOF roof saves on heating costs, but it also makes a significant and sustainable contribution to environmental protection.
According to the FIW study report (calculation with DIN EN ISO 6946, values in each case with thermal insulation 180 mm and WLG 035) you can save annual energy costs by using spacer constructions with optimised U-values.
| Heat transfer coefficient im Undisturbed area in W/(m² x K) |
120 | 0.280 | 0.291 | 0.269 | 0.269 | 0.269 | 0.269 | 0.280 | 0.280 |
| 140 | 0.245 | 0.257 | 0.239 | 0.239 | 0.239 | 0.239 | 0.242 | 0.242 | |
| 160 | 0.214 | 0.228 | 0.212 | 0.212 | 0.212 | 0.212 | 0.212 | 0.212 | |
| 180 | 0.189 | 0.202 | 0.188 | 0.188 | 0.188 | 0.188 | 0.189 | 0.189 | |
| 200 | 0.170 | 0.180 | 0.168 | 0.168 | 0.168 | 0.168 | 0.171 | 0.171 | |
| 220 | 0.156 | 0.161 | 0.151 | 0.151 | 0.151 | 0.151 | 0.156 | 0.156 | |
| 240 | 0.143 | 0.146 | 0.137 | 0.137 | 0.137 | 0.137 | 0.143 | 0.143 | |
| 260 | 0.132 | 0.134 | 0.126 | 0.126 | 0.126 | 0.126 | 0.132 | 0.132 | |
| 280 | 0.123 | 0.126 | 0.119 | 0.119 | 0.119 | 0.119 | 0.123 | 0.123 | |
| 300 | 0.115 | 0.122 | 0.114 | 0.114 | 0.114 | 0.114 | 0.115 | 0.115 | |
| Heat transfer coefficient including thermal bridges in W/(m² x K) |
120 | 0.302 | 0.296 | 0.302 | 0.328 | 0.363 | 0.410 | 0.304 | 0.321 |
| 140 | 0.264 | 0.262 | 0.271 | 0.296 | 0.329 | 0.375 | 0.261 | 0.275 | |
| 160 | 0.231 | 0.232 | 0.243 | 0.268 | 0.300 | 0.344 | 0.229 | 0.241 | |
| 180 | 0.204 | 0.206 | 0.219 | 0.243 | 0.273 | 0.316 | 0.208 | 0.220 | |
| 200 | 0.183 | 0.183 | 0.198 | 0.221 | 0.250 | 0.291 | 0.208 | 0.203 | |
| 220 | 0.168 | 0.164 | 0.180 | 0.203 | 0.230 | 0.270 | 0.177 | 0.190 | |
| 240 | 0.158 | 0.149 | 0.165 | 0.188 | 0.214 | 0.253 | 0.165 | 0.179 | |
| 260 | 0.146 | 0.137 | 0.154 | 0.176 | 0.201 | 0.238 | 0.155 | 0.169 | |
| 280 | 0.136 | 0.129 | 0.146 | 0.167 | 0.191 | 0.227 | 0.147 | 0.161 | |
| 300 | 0.127 | 0.124 | 0.146 | 0.167 | 0.184 | 0.219 | 0.139 | 0.153 | |
| Description of construction |
Thermal insulation thickness (mm) |
RIB-ROOF with standard clips/ directional clips 200/ Directional profile 1500 on a two-layer wooden substructure construction Construction 1 |
RIB-ROOF with clip border/ directional profile 750 on rigid thermal insulation Construction 2a |
RIB-ROOF with standard clips/ directional clips 200 on two-layer Z-profiles with two thermal separation strips Construction 3a/b |
RIB-ROOF with standard clips/ directional clips 200 on single-layer Z-profiles with two thermal separation strips Construction 4a/b |
recommended: single-layer Thermo-Z spacer profiles without thermal separation strips Construction 5a/b |
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| Interval (m) | B = 1.19 | B = 1.80 | B = 1.80 | B = 1.20 | B = 1.80 | B = 1.20 | B = 1.80 | B = 1.20 | |
The maximum load-bearing width of the walkable area differs depending on the material, support and substructure.
We would be happy to assist you in determining project-related clip distances (or span limits). The pull-out values for your selected fastener must be checked for the specific substructure. Just contact us!
The values according to DIN EN 1991-1-4 are taken into account for both the calculation of wind loads and the verification of clamped connections.
|
Wind zone |
νb,0 | qb,0 |
| WZ 1 | 22.5 m/s | 0.32 kN/m² |
| WZ 2 | 25.0 m/s | 0.39 kN/m² |
| WZ 3* | 27.5 m/s | 0.47 kN/m² |
| WZ 4* | 30.0 m/s | 0.56 kN/m² |
* Installation of our RIB-ROOF Evolution or RIB-ROOF Speed 500 directional clips/profiles is recommended for wind zones 3 and 4.
The product data sheets contain interesting technical information about our Zambelli RIB-ROOF products.
You will find the information in our download section.
Zambelli Holding GmbH Passauer Straße 3+5, D-94481 Grafenau/Haus im Wald
Phone +49 85 55 409 0 E-Mail info@zambelli.com
