01
Reinforced concrete ceiling
All systems usable — standard case. Observe minimum thickness per approval.
↳ Next step
Have your floor slabs checked.
We check your floor slabs and install compliant seals — including for difficult ceiling types.
↳ Cable Seal / Ceiling
Cable seal — ceiling
Protection against vertical fire spread. Ceiling penetrations are particularly critical from a fire protection perspective: through the chimney effect a fire spreads vertically faster than horizontally. Higher requirements therefore apply — in execution, documentation and inspection.
↳ Chimney-effect protection
Cable seal with soft seal · reinforced-concrete ceiling
↳ Why particularly critical?
Chimney effect — hot fire gases rise.
Ceiling seals protect against vertical fire spread. The chimney effect means hot fire gases rise — an open or defective ceiling penetration becomes a building-wide fire spread within minutes. Vertical shafts without sealing act like a chimney. Higher temperatures in the penetration area also impose stricter material requirements. In high-rise buildings F90-AB (non-combustible materials) often applies; the approval must explicitly cover the ceiling construction.
↳ Ceiling types & systems
Reinforced concrete, trapezoidal, timber beam, hollow ceiling.
Each ceiling type requires its own ceiling-specific approval. We know the limits of every system.
02
Hollow-core / prestressed concrete
Soft seal, mortar and modular systems — check product-specific approval, not every system is released.
03
Steel trapezoidal sheet with topping
Approval must explicitly cover the trapezoidal construction — voids between corrugations must be closed.
04
Timber beam ceiling
Particularly critical — soft seal and special systems with timber-construction approval. Specialist planning required.
05
Hollow ceiling
Only with specific approval — often enclosure of the tray with fire-protective cladding required.
06
Raised floor / IT areas
Special solutions — usually a combination of seal and enclosure in data centres.
↳ Our ceiling services
Planning, installation, special solutions.
- ↳ 01
Coordinated planning
With electrical and drywall trades — ceiling penetrations are considered early in planning.
- ↳ 02
Installation of all common systems
Hilti, Promat, Würth, Rockwool, Roxtec, Hauff — we know the respective ceiling approvals.
- ↳ 03
Special solutions for difficult ceilings
Timber beam ceiling, hollow ceiling, trapezoidal sheet — with special systems and possibly enclosure.
- ↳ 04
Documentation
Photo, as-built plan, declaration of conformity.
- ↳ 05
Retrofit in existing stock
Also in existing ceilings — see retrofit detail page.
↳ Frequent questions ceiling
Answers on the ceiling seal.
↳ See also