Floor
slabs and planks

Use

Hollow-core slabs and planks are used to create floor and roof structures of buildings with a clearance of up to 3 m in residential housing developments, civic amenities, and anywhere where their length and loadbearing capacity are appropriate. The advantages of their use lie mainly in the speed of construction and the low labour intensity during the installation of floors, thus reducing the overall construction costs.

Types

• Planks are supplied in standard lengths with a 300 mm nominal width.
• Floor slabs with a height of 140 mm are supplied with a nominal width of 600 or 1200 mm.

Construction, variants

Planks with trapezoidal cross-section:

• full height planks 65 and 90 mm
• hollow-core planks with heights of 90 mm are lightened by four longitudinal 38 mm diameter voids.
• Hollow-core slabs with heights of 140 mm are lightened by two longitudinal 89 mm diameter voids.
• 140 mm high slabs are lightened by eight (1200 mm wide) or four (1200 mm wide) 600 mm) voids with a diameter of 102 mm. In both faces of each slab are embedded suspension lifting eyes for handling units, which is performed with the help of cable slings with hooks.

Material

• reinforced concrete of strength class C30/37 (or C35/45) (for slabs and planks)
• reinforced concrete of strength class C25/30 (for slabs 9 cm high from 239 cm long)

Loadbearing capacity

• planks are designed for an imposed load of 3 or 5 kN/m² (these values do not include slabs’ self-weight and the permanent load is considered to be 1.5 kN/m²)
• for atypical use of elements, it is always necessary to consult with the manufacturer or request instructions for an assessment
• slabs are designed for a live load of 1.5; 3.0 or 5.0 kN/m² (the above values of live load do not include the self-weight of slabs and the permanent load is assumed to be 1.5 kN/m²)
• atypical use of the product must be assessed by a structural engineer

Penetrations, cantilevers

• planks are not suitable for creating penetrations and cantilevers
• in the case of slabs, the creation of penetrations is possible to a limited extent after assessment by a structural engineer
• the normal design of lightweight floor slabs does not allow for use as a cantilever

Method of product installation

• solid plank H = 65 mm or lightweight plank H = 90 mm up to a length of 1 040 mm in a cement mortar bed with a specified placement of 65 mm on both sides
• hollow core planks H = 90 mm from the length of 1190 mm and H = 140 mm in a cement mortar bed with a specified placement of 140 mm
• any other placement must be assessed by a structural engineer
• according to the manufacturer’s installation instructions and the project
• slabs in a cement mortar bed with the placement of at least 140 mm on both sides
• a smaller placement is possible after consultation with the manufacturer before element production

Surface treatments

• The soffit of a slab or plank suits the application of plaster, in aesthetically less demanding areas, only painting is recommended
• the upper surface of a plank is left untreated in appearance

Certificates and regulations

• product certificate, authorized person TZÚS Praha (valid for floor planks)
• declaration of performance Prefa Brno a. s.
• quality system certificate according to ČSN EN ISO 9001

PZD floor planks

Lightweight floor slabs