Knauf Metal Ceilings
Overview
A ceiling constructed by assembling one or more plasterboard facings from the Knauf range, screwed onto a metal frame composed of F47 profiles supported by hangers such as timber hangers, steel/concrete hangers, or hollow-core slab/concrete hangers.
The use of the I-TEC upper hanger also allows for the use of studs on edge. This possibility constitutes the Knauf Metal Long Span Stud System (LP).
The plasterboard ceiling on a framework, as defined in D.T.R E 6.2.3 and the revised DTU 25.41, contributes to reducing the air permeability of the building envelope.
Applications
- New constructions or rehabilitation.
- All types of buildings: residential buildings of all categories, Public Access Buildings (ERP), High-Rise Buildings (IGH), industrial, commercial, or school premises.
Note
The furring channel/hanger or stud/hanger combination constitutes an inseparable suspension device whose breaking load must be greater than three times the permissible load.
It is necessary to verify that the permissible load of the hanger with the furring channel or stud used is greater than the load per hanger on the construction site, with a minimum of 25 kg.
Installation
These ceiling systems fall under traditional trade practices described in D.T.R E 6.2.3 "Execution works for plasterboard facings" and DTU 25.41 "Plasterboard facing works."
Characteristics
Performance in Seismic Zones
In the event of frequent seismic activity, the ceiling should not sustain damage requiring expensive repairs. During a reference earthquake, the fall of any element should not exceed dimensions that could pose a danger to individuals. In all cases, the collapse of a single element must not lead to the collapse of the entire structure.These requirements are met without special provisions when using Knauf pivot hangers, Knauf timber hangers, and Knauf U hangers, for ceiling weights up to 35 kg/m². Beyond this weight, specific arrangements may be necessary depending on the situation.
Fire Resistance
The fire stability and fire compartmentation duration provided by a ceiling to a frame or floor also depend on the number and type of boards used, the plenum height, the characteristics of the framework, and whether insulation is installed.Installation must strictly adhere to the reference test report. In certain cases of non-standard solutions, and in the absence of a test report, justification can be provided through a site assessment. This paid procedure, handled case-by-case by an approved laboratory, must be defined upstream with all installation details.
Thermal and Acoustic Insulation
While thermal performance primarily depends on the thickness of the insulation used, acoustic characteristics are influenced by numerous factors, including:
- The respective masses of the supporting floor and the ceiling.
- The airtightness of the supporting structure.
- The plenum heights and the presence or absence of a mineral fiber batt.
- The type of framework and hangers used.
Supporting Structure
Horizontal structures can only be installed in supporting structures that comply with regulations. Otherwise, an additional supporting structure will need to be designed and built by the relevant structural trade. The connection to the chosen structure by the installation company must also be designed and implemented according to the load.
Spans for Self-Supporting Knauf Metal Ceilings with Studs on Edge (Without Intermediate Hangers)
Double Studs Back-to-Back*
Characteristics | Facing | 1 KS 13 / 1 KS 15 | 2 KS 13 / 2 KS 15 |
Stud | M48 | M70 | M90 |
Profiles Spacing 0.60 m | Span (in m) | 2.35 | 3.00 |
Profiles Spacing 0.40 m | Span (in m) | 2.60 | 3.30 |
* It is not recommended to nest the studs due to issues with screwing the boards.
* The span tables for Knauf I-TEC Long-Span profiles are provided in the technical guide. Wall attachment is done using a rail of the same width, fastened to the wall with anchors every 0.50 m.
* When a ceiling is installed in premises with significant water ingress due to construction methods (plasters and/or screeds with hydraulic binders) and in particularly humid regions or periods, it is recommended to reduce this spacing to 0.50 m and to effectively ventilate the premises.
Acoustic and Decorative Plasterboard Ceilings
(DELTA Cleaneo Concept)
Overview
A non removable acoustic and decorative ceiling consisting of a 12.5 mm thick perforated plasterboard facing, coated on the reverse side with an acoustic fleece ensuring good protection in high frequencies and protection against dust. These are screwed onto a metal framework made of F47 profiles supported by hangers such as timber hangers, steel/concrete hangers, or hollow-core slab/concrete hangers.
These ceilings offer multiple volumetric possibilities. A particularly popular solution in meeting rooms, cafeterias, multi-purpose halls, restaurants, and amphitheaters.
The plasterboard ceiling on a framework, as defined in the revised DTU 25.41, contributes to reducing the air permeability of the building envelope.
Applications
- All types of projects subject to specific aesthetic and acoustic requirements.
- New constructions or rehabilitation.
- All types of buildings, but particularly tertiary buildings (commercial): retail, education, sports, healthcare, culture, leisure, etc.
- A particularly popular solution in meeting rooms, cafeterias, multi-purpose halls, restaurants, and amphitheaters.
For Air Quality Improvement:
Knauf Cleaneo® for the entire Knauf Delta range All boards in the Knauf Delta range benefit from the Knauf Cleaneo® innovation. This technology helps reduce certain pollutants, including VOCs (Volatile Organic Compounds), present in buildings (particularly formaldehydes), thereby contributing to improved air quality and olfactory comfort.
Installation
These ceiling systems fall under traditional trade practices described in D.T.R E 6.2.3 "Execution works for plasterboard facings" and DTU 25.41 "Plasterboard facing works."