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False ceiling made of plasterboard with acoustic and thermal insulation

A plasterboard false ceiling, under metal frame fixed by lines can allow a very effective acoustic and thermal insulation. It is then easy to paint or wallpaper. The lines are here screwed under the joist of the ceiling of raw fir which can not have any decorative character. Glass wool panels are an excellent thermo-acoustic insulation.

Necessary material

  • Hammer
  • Drill
  • Stool
  • Bubble level
  • T-bracket
  • Handsaw
  • Cutter
  • Folding Meter
  • Screwdriver
  • Screw
  • nails

Steps

  1. Laying metal furs
  2. Placing insulation and plasterboard

Laying metal furs

Nail the lines to the rafters

Nail the lines to the rafters

1. The plasterboard of this false ceiling is reported under metal furs forming a framework. This is fixed under the joists by lines. This system makes it possible to dampen the dimensional variations of the joists, thus avoiding the cracking of the plates which would not fail to occur if they were fixed directly on the joists. The metal furs are thus suspended from the rafters via lines of length adapted to the desired ceiling height and the desired insulation thickness. They are nailed with a thin vertical breakdown hammer and round strike. The series of holes drilled in the lines allows to adjust the positioning. The maximum distance between two lines is generally 1.30 m. A line must be placed at each end.

Interlocking profiles on the lines

Interlocking profiles on the lines

2. The furs are easily attached to the lines, by simple interlocking. Check the flatness and horizontality of the profiles with a bubble level. Adjust the position of the lines on the joists accordingly.

The spacing of the profiles is generally between 30 or 40 cm

The spacing of the profiles is generally between 30 or 40 cm

3. The spacing of the metal profiles is a function of the plasterboard used. Always less than 50 cm, it is usually 30 or 40 cm. When laying furs, consider the location of the joints between the plates. These pose perpendicular to the furs.

Placing insulation and plasterboard

Installation of a layer of insulation on the frame

Installation of a layer of insulation on the frame

1. The realization of a false ceiling of this type is an opportunity to achieve an effective acoustic and thermal insulation. The space between the joists and the plasterboard is occupied by the insulation (here glass wool); it is also possible to fill the space between the joists with insulation.

Cutting with handsaw

Cutting with handsaw

2. Gypsum board cuts can be made by hand saw, cutter or with a specific electric tool. For specific cuts (outbound or inbound corners), first refer to the measurements based on the wall profile.

Lay the plates perpendicular to the metal profiles

Lay the plates perpendicular to the metal profiles

3. Place the plates perpendicular to the metal furs. Make a T-shaped carrying tool to support the plate during installation and fixation. The plates are screwed under the metal furs. Use suitable screws spaced 30 cm apart. Press the screw heads at least 1 cm below the face of the plate. Re-fill the holes with plaster. Make the joints between the plates with plaster and calico.

(photos / visuals: © DIY-Prod, except special mention)

False ceiling made of plasterboard with acoustic and thermal insulation: made

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