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Don't be afraid of the Buildings Energy Act.

Our RIB-ROOF metal roof systems minimise thermal bridges, ensuring your 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 is now being replaced by the GEG. With this in mind, we have now revisited the topic of thermal bridging effects with the roof superstructures we endorse.
FIW Forschungsinstitut für Wärmeschutz e.V. Munich recently conducted a study on the thermal bridge effect of various attachments for light metal roofs by means of two- and three-dimensional numerical calculations. The findings confirm that our RIB-ROOF metal roof systems exhibit optimum U-values for all common insulation thicknesses. This means not only that a RIB-ROOF roof saves on heating costs, it also makes a significant and sustainable contribution to environmental protection.

How to reduce energy costs.

The FIW study report (calculation with DIN EN ISO 6946, values in each case for 180 mm of thermal insulation and WLG 035) shows how you can save annual energy costs by fitting a spacer for optimised U-values.

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 0.139
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 the structure
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 strip/
directional profile 750
on walkable 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
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

Playing it safe.

The maximum load-bearing width of the walkable area differs depending on the material, support and substructure.

We would be happy to assist in determining rules for clip distances (or support spans) on the specific property. The pull-out values for your selected fastener must be checked for the specific substructure. Just contact us!

Standard-compliant calculations.

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 zones.

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.

Summarised technical information.

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