Floor timber beams - fixed directly on wooden beams


Floor timber beams with Grenaboard , fixed directly on wooden beams.
The board fixed directly on the bottom side of wooden beams with screws 3,5 x 45 mm, spacing 200 mm. Screws placed min. 10 mm from edge of board.
The connections of boards cover with tape 50 mm width and bonded with gypsum seal.

Fire-resistant of construction REI 60
References >>

Wooden beam construction

The wooden beams from soft wood or wood with higher density with min. dimension 100 x 200 mm. Spacing of wooden beams max .600 mm.


  • Chipboard min. 22 mm thick and density min. 650 kg/m3 or different material, eventually combination of materials with thickness min. 22 mm and density min. 650 kg/m3
  • Floor panels fixed with screws 3,5 x 45 mm in spacing 250 mm

Technical parameters

  • vermiculite board, thickness 16 mm
  • density 480 kg/m3
  • both sides surfaced with paper
  • format 1200 x 2400 mm
  • weight of board 7,70 kg/m2; 22,12 kg/board

Basic conditions

  • maximal dimension of ceiling construction without supporting is 3 x 4 m
  • minimal cavity between floor and Grenaboard ceiling is 200 mm = min. beam high
  • roof slab slope shell be in the range of 0 - 25°
  • no combustible material in the cavity
Other conditions are in instruction for assembling.
Assembling of fire-resistant constructions approved after technical advice.

Ceiling and soffits with required fire resistance

Fire-resistant ceilings refer to building structures which prevent the spread of fire in a vertical direction by separating fire compartments in this direction. Fire resistance and the type of structures (from the point of view of response to fire) are determined by the fire safety degree of the fire compartment under fore-resistant ceiling (soffit)
Fire-resistant ceilings or ceilings inside a fire compartment which contain soffits (soffits with dependent function) are assessed as a whole. The contribution of the fore-resistant and protective function of suspended ceilings with dependent function, which enhances fire resistance of the ceiling structure, depends on the characteristics of the soffit as well as ceiling structure.
Fire-resistant ceilings or ceilings inside a fire compartment with suspended soffits (soffits with independent function) where fire load occurs between the soffit and the ceiling structure (such as cable distribution systems, pipes containing flammable liquids or gases, etc.) and where the sofft has a fire-resistant and protective function, are assessed either as two independent horizontal structures, and the pace between the soffit and the ceiling is regarded as an independent fire compartment, or under certain circumstances, they are assessed as whole.
In all cases where fire load occurs between the ceiling and the soffit structures, the soffit structure is to be assessed both from the upper side (with respect to fire load above the soffit) and from the lower side (with respect to fire risk under the soffit).
For all types of ceilings and suspend ceiling (soffits), very light and strong non-combustible boards Grenaboard are suitable.


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