Filigree ceiling

filigree ceiling

A filigree floor is a semi-prefabricated floor system consisting of a thin concrete slab 5-7 cm thick with integrated truss reinforcement. They are manufactured from concrete of class C25/30 or higher, with spatial reinforcement to carry installation and service loads. They are used in residential, office and industrial construction as an economical alternative to monolithic floors.

For each project filigree ceiling price is calculated individually, taking into account the area, span and structural requirements. We guarantee competitive rates while maintaining the highest quality of prefabricated floor elements. We invite you to request a free quote tailored to your investment.

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Filigree ceiling – innovative semi-prefabricated slabs

The filigree floor is a modern construction solution that combines the advantages of prefabrication with the flexibility of a monolithic system. It consists of a prefabricated concrete slab with a thickness of 5-7 cm, which is a lost formwork. Semi-prefabrication technology eliminates the need for full formwork while preserving the freedom of shaping the floor. Filigran slabs are characterized by integrated truss reinforcement extending above the slab surface.

Production of filigree slabs is carried out under controlled factory conditions on special production tables. Concrete of minimum class C25/30 is used to ensure adequate early strength. The bottom reinforcement is ϕ8-12 mm bars of BSt500S steel arranged according to the design. The filigree floor is then equipped with space trusses with a height of 12-24 cm.

The structural system of the filigree floor makes it possible to cross spans from 2.5 to 9 meters. Filigree slabs are produced in standard widths of 2.4 m or 2.5 m to suit transportation. The length of the slabs is individually adjusted to the project with an accuracy of 1 cm. In addition, the filigree floor can be made with installation holes and cutouts.

The strength parameters of the filigree floor after being combined with superconcrete correspond to monolithic floors. The total thickness of the floor ranges from 16 to 30 cm, depending on the span and loads. The characteristic load capacity reaches 5-15 kN/m² for typical applications. In addition, filigran slabs provide structural rigidity with deflections not exceeding L/250.

Truss reinforcement in a filigree floor has multiple structural functions. The trusses transmit shear forces between the precast and the superconcrete providing composite. The height of the trusses determines the thickness of the reinforced concrete and the total structural height of the floor. However, the filigree floor requires additional top reinforcement placed on site.

Semi-reinforced filigree slab technology offers a wide range of possibilities for adaptation to project requirements. The filigree floor can be made as unidirectionally or bidirectionally reinforced. Filigree slabs allow forming slopes, making openings and undercuts. Above all, the filigree floor allows the free routing of utilities in the superconcrete layer.

Key advantages of the filigree floor

Filigree ceiling – elimination of full formwork

The filigree floor reduces the need for system formwork by 80-90% relative to a monolithic floor. The filigree slab is a self-supporting formwork requiring only installation supports every 1.5-2.0 m. Elimination of formwork reduces rental and labor costs by 30-40% of the value of the floor. The lack of removal of formwork accelerates the work schedule by 2-3 weeks. Time and cost savings make filigree technology more economical for large areas.

Speed of installation of filigree panels

The installation of filigree slabs is carried out at a rate of 200-300 m² per day by a 4-person crew. The filigree floor is laid by crane directly from the car to the installation supports. Filigree slabs with a width of 2.4 m cover a large area with a single element. In addition, the lack of time-consuming formwork shortens the time of ceiling construction by 50%. The immediate possibility of laying reinforcement and installation speeds up the progress of the work.

Filigree ceiling – quality of the underside surface

Factory-produced filigree slabs feature a smooth bottom surface ready for painting. The filigree floor eliminates the unevenness and flare typical of formwork concrete. The even surface reduces the use of finishing materials by 20-30%. Subsequently, the quality of the underside of the filigree ceiling does not depend on the skills of contractors on the site. The aesthetics of the ceiling meet premium finishing standards.

Can be modified on site

The filigree floor allows changes and adaptations to be made during construction. Filigree slabs can be cut on site to fit irregular projections. Installation holes are made by drilling before concreting the superconcrete. In addition, the overhead reinforcement is placed according to actual construction needs. The flexibility of the filigree system is superior to fully prefabricated solutions.

Load-bearing capacity and structural rigidity

When composite, the filigree floor achieves the same parameters as a monolithic floor. Filigree slabs cooperating with superconcrete form a homogeneous reinforced concrete slab. The imposed load capacity of 5-10 kN/m² is sufficient for all types of buildings. However, the rigidity of the filigree floor eliminates vibrations and long-term deflections. The structure meets the highest requirements for user comfort.

Reducing the weight of your own design

A filigree floor with a total thickness of 20 cm weighs about 400 kg/m². Filigran slabs are 15-20% lighter than solid monolithic ceilings of the same bearing capacity. The reduction in dead loads reduces the dimensions of foundations and bearing walls. In addition, the lower weight makes it easier to transport and install the elements. Material savings reach 10-15% of construction costs.

Filigree ceiling – fire resistance

The filigree floor provides a fire resistance of REI 60-180, depending on the thickness and lagging. Filigree concrete slabs retain their load-bearing capacity under fire conditions for the required time. Monolithic composite eliminates weakening at the joints of the elements. In addition, the ability to increase the top lagging improves fire performance. The system meets the requirements for high-rise and public buildings.

Economics of investment

Filigran slabs offer the best value for money among floor technologies. A filigran floor is 20-25% cheaper than a monolithic floor for the same load-bearing capacity. Savings result from the elimination of formwork and reduced construction time. However, the operating costs are the same as for monolithic structures. The investment in the filigree floor pays for itself already at the first implementation.

filigree slab

Composite floor Filigree slab

The use of the filigree floor in construction

The filigree ceiling is widely used in multi-family housing construction. It is used for interstory floors in buildings up to 25 stories. Filigran slabs are ideal for structures with a regular grid of columns and walls. In addition, the system allows free shaping of the floor plan. The technology is dominant in modern development construction.

Office and commercial buildings use filigree slabs for large spaces without supports. The filigree floor allows spans of up to 9 meters in column axes. The system allows any arrangement of lightweight partitions. Subsequently, the freedom to run installations in the superconcrete facilitates adaptations. Flexibility of office space arrangement increases the commercial value of the building.

Industrial construction uses the filigree floor in warehouse and production halls. Filigran slabs are used as interstory floors and mezzanines. The load-bearing capacity of the filigree floor of up to 15 kN/m² allows the storage of heavy materials. In addition, the resistance to dynamic loads allows forklift traffic. The system works well in high-storage logistics facilities.

Multilevel parking lots are increasingly being built using filigree slab technology. The filigree floor provides the required load-bearing capacity for the movement of cars and delivery trucks. The smooth surface of the underside eliminates the need for additional finishing. However, resistance to the chemical aggression of salt and oil prolongs durability. The technology speeds up the construction of underground and above-ground parking lots.

Retrofits and superstructures of existing buildings use filigree slabs as a lightweight solution. The filigree floor does not overload the existing structure like a monolithic floor. The possibility of elevator transport allows implementation in compact buildings. Above all, minimal vibration during installation does not interfere with the use of the building. The system is ideal for attic adaptations and increasing the number of floors.

Filigree ceiling

Technical parameters of the filigree floor

The base plates of the filigree floor are manufactured from concrete of minimum class C25/30 with a strength of 25 MPa. The thickness of the filigree slab is standard 5, 6 or 7 cm depending on the span. The width of the standard slabs is 2.40 m or 2.50 m limited by transport capacity. The length of filigree slabs is produced to the size of up to 12 meters. The weight of the slab is 125-175 kg/m² depending on the thickness.

The reinforcement of filigree slabs consists of bottom mesh and space trusses. The main bottom reinforcement consists of ϕ8-12 mm bars spaced at 10-20 cm intervals. Trusses made of ϕ6-9 mm bars are 12 to 24 cm high. The filigree ceiling requires additional top reinforcement ϕ8-12 mm laid on site. The reinforcement cover is a minimum of 20 mm from the bottom and 25 mm from the top.

The total thickness of the filigree floor after superconcrete is from 16 to 30 cm. Standard thicknesses are 18, 20, 22, 24 cm for typical spans of 4-7 meters. The thickness of the over concrete is 11-23 cm above the filigree slab, respectively. The filigree slabs with superconcrete form a monolithic slab with full composite. The total weight of the floor is 400-600 kg/m².

The characteristic load capacity of filigree slabs is determined for a specific thickness and span. The standard imposed load is 2.5-5.0 kN/m² for residential buildings. The filigran floor for parking lots carries loads up to 10 kN/m². Then for industrial halls, load capacities of up to 15 kN/m² are possible. Limit deflections do not exceed L/250 under total load.

Certification of the filigree floor includes CE marking in accordance with PN-EN 13747. The manufacturer of filigree slabs provides a declaration of performance. The system has ITB technical approvals for use in Poland. In addition, production control is carried out in the 2+ system by a notified body. The documentation includes assembly drawings and load-bearing tables.

filigree ceiling

Installation of the filigree ceiling – instructions for implementation

Preparation for the installation of the filigree floor begins with the placement of mounting supports. The supports are placed at a spacing of 1.5-2.0 m in a direction perpendicular to the span of the slabs. The supports must be set on a stable foundation with adjustable height. Then the level of the walls and stringers that support the filigree slabs is checked. The level tolerance of the supports must not exceed ±10 mm.

Transportation and placement of filigree slabs is carried out with the help of a crane with appropriate lifting capacity. The filigree slabs are hooked up with hook slings at the points indicated by the manufacturer. The filigree floor is laid according to the installation plan starting from the extreme spans. In addition, each slab is supported on the walls a minimum of 10 cm on each side. Adjacent filigree slabs should adhere tightly to each other.

The additional reinforcement of the filigree ceiling is installed after all the slabs are assembled. Support reinforcement over walls and beams is made of ϕ12-16 mm bars. The top mesh is laid over the entire surface of the ceiling with overlaps of at least 20 cm. Then the edge reinforcement, rims and hole reinforcement are installed. All bars must be provided with a minimum lag of 25 mm from the top.

Installations in the filigree ceiling are carried out before concreting in the over concrete layer. Electrical pipes are attached to the trusses or top reinforcement. Installation penetrations are made by embedding sleeves in appropriate places. In addition, filigree slabs can be drilled for penetrations up to 15 cm in diameter. All installations must maintain the lagging of the reinforcement.

Concreting over concrete of filigree slabs is done with concrete of minimum class C20/25. The surface of filigree slabs is wetted with water for better bonding. Concrete is placed evenly over the entire surface of the floor without working gaps. However, the thickness of the over-concrete is controlled continuously with patches and height points. Compaction is carried out with plunge vibrators with care at the trusses.

Care of the filigree floor consists in keeping the concrete moist for a minimum of 7 days. The surface is covered with foil or geotextile and sprinkled with water. The mounting supports under the filigree slabs remain a minimum of 14 days after concreting. Then the removal of supports is done gradually from the center of the span. The full load-bearing capacity of the filigree floor is obtained after 28 days of concrete maturation.

TRANSPORTATION OF THE FILIGREE FLOOR

Reinforced concrete filigree floors should be transported by truck in a horizontal position, with steel trusses facing upward.
During transport, the elements should be secured with straps against the possibility of displacement relative to the means of transport and against damage to the bottom surface of the prefabricated panels.
Fasten the straps in such places that they coincide with the position of the spacers.
The plates are stacked on the car, on wooden spacers. The spacers must lie across the plates across the entire width of the element, at the node of the connection between the cross member and the top chord of the truss.
Each time after loading the floor slabs on the truck, check that the slabs are not damaged or defaced in any way.

Filigran floor slabs should be laid directly from the vehicle to their final installation location (on the floor). If this is not possible and it is necessary to store the delivered prefabricated elements on site, follow the storage recommendations below.

Storage

Storage installation and transportation of the filigree floor

Floor slabs should be laid only horizontally on levelled wooden spacers or other material to ensure a uniform plane. It is recommended to store on level and paved surfaces (or on the target already laid slabs at the level of the built-in prefabricated elements).
Floor slabs should be stacked no higher than 6 layers of slabs.
The number of plates also depends on the height of the trusses – the stack should not exceed a height of 1.5 meters.
The spacers must lie across the plates across the entire width of the element. They must be laid only at the top chord nodes of the truss.

Principles of ceiling installation

Installation and transportation of the filigree ceiling

Prefabricated Filigran floor slabs are produced individually and differ in the amount of reinforcement in the bottom zone and the number of spatial trusses (despite their very similar geometry), so to avoid confusion the prefabricated slabs are numbered according to the assembly plan included in the detailed design.

It should also be checked whether the load capacity of the crane at the maximum needed overhang, is sufficient to lift the panels. The weights of individual slabs are given in the installation drawing (the estimated weight of a 5 cm thick slab is 125kg/m2, and a 6 cm thick slab is 150kg/m2). Of course, the greater the thickness of the slab and the larger the dimensions of the slabs, the greater the weight.

Use rope (chain) slings or traverse slings with self-adjusting load-bearing slings for lifting the precast. For rope slings, the angle between the tensioned rope and the plane of the slab must not be less than 60º. When installing slabs with rope slings – lift the slabs by the 2nd and 3rd grating (in the case of 4 grating), by the 2nd and 4th grating (in the case of 5 grating).
When transporting and installing filgran panels, the hooks should be hooked through the cross-braces in the nodes of the lattice girders. Do not, under any circumstances, put the hook behind the top bar between the truss nodes.

Filigran ceiling principles of installation and transportation

The distance from the hooking point to the edge of the panels should be a maximum of 1/5 of the total length of the prefabricated element. Lifting and laying of the elements should be done evenly, without violent jerking.
Special care should also be taken to prevent the lifted and laid element from hitting other objects or building elements. Laying of the element should be done slowly and carefully, simultaneously on fixed supports and mounting supports.

Ceilings filigree wall support

Filigran ceiling support principles and installation support spacing

Mounting supports should be set on a rigid base before laying prefabricated floor slabs. The yokes of the assembly supports designed to hold the support elements should be set perpendicular to the expected direction of laying the steel trusses of the elements. The spacing of the mounting supports should be in accordance with the design documentation.
Outrigger supports should be set at a distance of no more than 300 mm from fixed supports (walls, beams, etc.). Outrigger supports should be set up when the support area (depth) of the filigree ceiling is less than 50 mm or when less than every second node of the bottom chord truss is above a fixed support. The support of the filigree ceiling should be done with due care.
In other cases, the use of supports is recommended because it facilitates the leveling of the performed ceilings. The spacing of supports in the direction of support (perpendicular to the trusses) should be max. 1,5 m. After the insertion of support elements, e.g., the edges into the yokes, the supports must be accurately leveled. Mounting supports should be equipped with a mechanism (e.g., screw) for adjusting their height.

Filigree ceiling price – current price list 2024/2025

The filigree floor price is competitive compared to other floor technologies available on the market. Filigran ceiling price depends on the thickness of the base slab, the span and the amount of reinforcement in the element. Filigran slabs price takes into account the class of concrete and the complexity of the structural design. Filigree ceiling price per square meter varies depending on the region and scale of the order. In addition, the filigree floor price includes the cost of design and execution documentation.

Filigree ceiling price – calculation by area

Filigran slabs price increases with the total thickness of the ceiling and the span. Filigran ceiling price for a standard thickness of 20 cm is the base price base. Filigran ceiling price at 24 cm thickness is 15-20% higher per square meter. Filigran slabs price for large spans of 7-9 m increases by 30-40%. Then the filigran ceiling price takes into account the cost of reinforced reinforcement and higher trusses.

Filigree ceiling price list 2024 – current market rates

The filigree slab price list in 2024 reflects the increase in the price of reinforcing steel and cement. Ceiling filigran price 2024 has been adjusted for construction inflation of 7-9% per year. Ceiling filigran price is effective from January 2024 with monthly updates. The filigree slab price is quoted net ex-factory or franco construction. However, filigree ceiling price may include volume discounts for large projects.

Comprehensive delivery – filigree ceiling kit price

Filigree slabs price is often calculated comprehensively with design and installation. Filigree ceiling price per set includes slabs, detailed design and technical advice. Filigree ceiling price may also include additional reinforcement and installation accessories. Filigran slabs comprehensive price simplifies the settlement of the investment for the contractor. In addition, the filigree ceiling package price is 10-12% more favorable than separate purchases.

Transportation and unloading – filigree ceiling logistics price

Filigree slabs transport price depends on the distance and the number of elements in the delivery. Filigree ceiling the price of transportation is on average 8-12 zlotys per kilometer for the transport set. Filigree ceiling the price of unloading by HDS at the construction site additionally is 400-500 zlotys. Filigree slabs price may include free transportation when ordering more than 500 m². In addition, ceiling filigree price franco construction is offered for overall contracts.

Filigree ceiling price 2025 – forecasts and trends

Filigree slabs price in 2025 is projected with an increase of 4-6% over the current year. Ceiling filigran price list 2025 will take into account rising energy costs and environmental requirements. Ceiling filigran price can be stabilized by production automation and optimization. Filigree slabs price in 2025 will remain competitive with other technologies. Above all, the filigree floor price will retain its economic advantage over monolithic floors.

Cost comparison – filigree ceiling price of different systems

Filigran ceiling price is 20-25% lower than monolithic ceiling with identical load-bearing capacity. Filigran slabs price is 10-15% higher than the Teriva dense-rib system. Filigran ceiling price is comparable to the Filigran system of competing manufacturers. Filigran slabs price per m² of finished floor is the most authoritative indicator. However, the filigran floor total price takes into account savings in time and labor.

Filigran ceiling final price is determined individually after analysis of the structural design. Filigran slabs price includes technical advice in selecting the optimal parameters of the ceiling. Filigran ceiling price includes complete installation documentation and static calculations. Filigran slabs price guarantees the best ratio of quality to investment. Ultimately, the filigran ceiling price represents an investment in the fast and reliable implementation of the floor structure.

Here are just some of our filigree floor realizations. This list includes only large investments on which our prefabricated products have appeared.

Frequently asked questions by our customers about Filigran floor – FAQs

What is a Filigran floor?

The filigree floor is a modern and versatile type of reinforced concrete floor. It consists of a prefabricated thin concrete slab reinforced with mesh and over concrete poured on site. It allows the construction of ceilings with large spans and complex shapes, which gives freedom in building design.

What is the price of Filigran floor in 2025?

90-150 PLN net / m2

What are the dimensions of the Filigran floor?

Span up to 12m, width up to 2.5m, thickness 5-8 cm

What is the use of Filigran ceiling?

All types of buildings, balconies

What are the properties of the Filigran floor?

Large spans, any openings, removal of supports after 2 weeks, smooth surface

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