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The two-layer insulation between rafters and sub-creepers is effective and limits the loss of interior volumes in the attic.

Insulation of crawling soffits in the attic

Screwing the lines on rafters in the attic

  • Screw the metal hangers on the side of the rafters by spacing the lines by 60 cm.
  • Use a nylon cord to position them.

Between the rafters: install the first layer of insulation

Cut the glass wool

  • Measure the distance between each chevron and cut out glass wool strips by adding 1 cm in width.
  • Each lé will thus hold without fixation.

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Laying glass wool

  • Slide each side between the rafters.
  • Work from top to bottom to make the job easier.
  • Wear gloves, glass wool is irritating.

Place the glass wool

  • Place the strips flush with the rafters.
  • The thickness of the insulation must correspond to the height of the rafters minus 2 to 4 cm (air gap to ventilate the roof).

Between rafters and furs: install the second layer of insulation

Measure and cut of metal furs

  • Measure and cut metal furs with a sheet metal shear.
  • They are then clipped without tools on the lines.

Lay the insulation of the attic

  • Slide the second layer of insulation behind the metal furring (without air gap) by putting the vapor barrier (craft paper) into the room.

Adhesive the protective film of an insulation

  • Glue double-sided tape along each of the metal furs to glue the future protective film.

Install a vapor barrier

Put a vapor barrier in the attic

  • For better airtightness, add an independent vapor barrier.
  • Apply the film bridging slightly back against the gable wall.

Cover an insulation with a vapor barrier

  • Cover the entire surface with the vapor barrier film, making sure each strip overlaps the previous one by at least 10 cm.

Well grout the vapor barrier after laying

  • Make the joints between the vapor barrier strips using special tape grouting at each fitting.

Glue the return of the vapor barrier

  • To make the adhesion to the masonry more resistant, fix the return of the vapor barrier against the wall sprocket, with putty sealant.

Install the drywall

Screw the finishing coating over the loft insulation

  • Screw the finishing coat into the furs (here a plasterboard).
  • Then cut the excess of the membrane against the pinion.


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