LAMILUX Continuous Rooflight: The technical details

Design details

Dynamic torque control – DTC

Effect: Suspension integrated beneath the glazing bar in the installation frame (DTC spring) ensures that the glazing is perfectly tensioned. It is therefore secured in position by a specific holding force even when subjected to load.
Benefit: The glazing remains perfectly tensioned in all situations and is optimally secured, since the acting loads are optimally cushioned and absorbed by the mounting frame.

DTC - Protection in the event of heavy wind loads

  • High stability of the flaps, even when open
  • Improved anchoring of the polycarbonate glazing
  • Greater protection of the casement systems due to spring-mounted multiple-joint traverses

The active expansion absorber – AEA

Effect: The active expansion absorber (AEA) compensates the tensions and expansions that occur when subjected to loads. To this end, the sealings are connected to the cover plates with a continuous, shear-resistant bond.
Benefit: Optimal protection of the structure in the event of snow, ice, wind and strong heat build-up.


AEA – Safety aspects in detail

  • The glazing is connected to the cover plates and the glazing bars with a tight, form-fitting seal.
  • The cover plates have integrated safety rails for mounting fittings, solar protection installations and maintenance equipment.
  • The clamping security is increased due to an extended adhesion region.

The isothermal load converter – ITL

Effect: The isothermal load converter (ITL) channels the load on the continuous rooflight into the framing construction of the continuous rooflight. Since this frees the base profile from loads and tensions, there is no need to use metal material and high-quality composite material with very good heat-insulating values can be used for the base profile.
Benefit: The isothermal load converter (ITL) achieves optimised isothermal lines running continuously through the structure and prevents thermal bridges.

ITL – Benefit from optimum energy efficiency

  • Excellent Uf values in the base profile and even better Heat insulation
  • Improved load-bearing capacity of the base profile
  • Significantly reduced risk of condensation
  • Optimised rebate ventilation
  • Smooth interior with fewer edges, ensuring less dirt and grime

Linear burn-through protection – LBP

LBP – Well-engineered fire safety technology


  • Prevents fire from spreading onto the roof through roof penetrations in accordance with specifications in DIN 18232, Part 4
  • Patented technology
  • Negates the need to place gravel around the continuous rooflight

Effect: Fastened to a framing construction such as an upstand, the roofage is typically pulled up to the upstand beam and fed under the continuous rooflight base profile. In the event of a fire inside the building, the roofage on the inside of the upstand beam will often catch fire and tends to burn like a “fuse” to the outside of the roof.
The linear burn-through protection (LBP) can be understood as an intelligent system for limiting the spread of fire in the region of roof penetrations. The continuous rooflight profile plays an essential role in this: it is composed of a thermoplastic composite material which melts at extreme temperatures on the upstand beam and spreads directly over the burning edge of the roof sheeting. As a result, the burning joins are sealed, the oxygen supply is interrupted and the flames at this point are extinguished.
Benefit: The LBP prevents the flames from spreading to the roof. Despite being melted by the extreme temperatures, the base profile remains stable during the fire because it is cooled and stiffened by the metal profile of the glazing bar.

Energy efficiency

Optimised isothermal lines

Isothermal lines describe lines of equal temperature. In the LAMILUX CI System Continuous Rooflight B, they run continuously through the structure. Our guarantee: a considerably minimised risk of condensation on the inside of the structure.

The comprehensive thermal protection technology throughout the structure ensures the best Uw values in our European-approved continuous rooflight. The energy efficiency properties have been tested and verified in accordance with ETAG 010. This ensures the consistent insulation properties in the continuous rooflight profile are documented. When an order is placed, the Uw values are calculated on a cost-neutral basis, and this calculation is confirmed with the certificate of quality.

Structural mount

  • Roof mounting variants include mounting on steel sheeting upstands, on wooden trusses or reinforced concrete upstand beams.
  • Stability is of primary concern with LAMILUX’s own steel sheet upstands. LAMILUX complies with the requirements of the German Institute for Building Technology (Deutsches Institut für Bautechnik),according to which sheet steel upstands must be manufactured using high steel grades S 280 GD + Z 275 or S 320 GD + Z 275.
  • Connectiondetail sandwich roof gem. IFBS Guidelines