Pleasant, comfort-adapted floors with Granab systems for a better working and living environment.

In a good living and working environment, it is important that floors are not hard or entirely rigid as this can lead to pain in the shoulders, back and legs. With their integrated impact-dampening effect, Granab systems provide comfortable floors with a documented degree of deflection for point loads.

Besides the subfloor construction and c/c distance between the girders, deflection during application of point loads on floors laid on a Granab system is also dependent on the choice of floor covering and how installation is performed. The respective flooring manufacturers provide information about deflection for each type of floor covering. Deflection of the finished floor construction with a point load of 1 kN should not exceed 2–3 mm according to the SP Technical Research Institute of Sweden. Testing and certification are conducted by the SP Technical Research Institute of Sweden. Contact Granab about full type-approval no. 192101. Granab systems with 22 mm chipboard and either 15 mm or 22 mm parquet have been tested in a number of residential projects by the SP Technical Research Institute of Sweden with respect to deflection of the completed floors. The results show an average deflection within 2 mm of other measurement points in each flat with a point load of 1 kN.

Documentation from measurements conducted by the SP Technical Research Institute of Sweden with alternative floor coverings from a large number of field measurements in completed residential projects can be provided by Granab upon request, as well as figures from lab measurements conducted by the SP Technical Research Institute of Sweden and measurements from a large number of assembled test floors in Granab’s testing facility with alternative floor coverings. All measurement results are within the margins for recommended values.

Testing methodology for completed floors

The SP Technical Research Institute of Sweden has developed a measurement method and device with digital deformation sensors for reliably and easily measuring the deflection of completed floors. Please contact us at Granab for information about the measurement device and instructions for use. Point-load deflection for Granab systems is in compliance with the applicable standards and recommendations. For the entire finished floor construction (including the floor covering) to attain the expected level of comfort – besides the choice of floor covering laid over the Granab system – it is important that both the Granab system and floor covering are installed by trained installers and floor-layers, and that the installation instructions and checklists are carefully followed.

Sample test measurements and laboratory tests of deflection when point loads are applied.

Granab systems with 22-mm chipboard and both 15-mm or 22-mm parquet have been tested in a number of residential projects by the SP Technical Research Institute of Sweden with respect to deflection of the completed floors. The results show an average deflection within 2 mm of other measurement points in each flat with a point load of 1 kN.

Documentation from measurements conducted by the SP Technical Research Institute of Sweden with alternative floor coverings from a large number of field measurements in completed residential projects can be provided by Granab upon request, as well as figures from lab measurements conducted by the SP Technical Research Institute of Sweden and measurements from a large number of assembled test floors in Granab’s testing facility with alternative floor coverings.

All measurement results are within the margins for recommended values.

Our systems

Granab subfloor system 3000N

For adjustable heights from 30 to 140 mm, excluding floor covering.

Granab subfloor system 7000N

For adjustable heights from 50 to 420 mm, excluding floor covering.

Granab Subfloor system 8000W

For adjustable height 85 – 470 mm, excl. Floor covering. For new construction and renovations, primarily for wooden flooring e.g., Cross-laminated timber.

Granab subfloor system 9000N

For adjustable heights from 70 to 420 mm, excluding floor covering.