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Isover

Implementation of the Opt'Air Membrane in Optima Wall System

Opt'Air membrane by Isover, a solution for the airtightness of masonry walls, is a material that nevertheless remains permeable to water vapor. Its electrostatic properties greatly facilitate its implementation on the masonry where it adheres directly. by simple marouflage. It is part of the complete "Optima murs" air-tightness system, which includes a GR 32 insulation mounted on metal slats and furs and the BA 13 plasterboard wall cladding.

Necessary material

  • Metre
  • Gloves
  • Rope
  • Cutter
  • Brush to be rubbed
  • Sealing gun
  • Extruder gun

Steps

  1. Lay the Opt'Air membrane on a masonry wall
  2. Seal the Opt'Air membrane at the periphery
  3. Variant for sealing the Vario Duplex membrane

Lay the Opt'Air membrane on a masonry wall

Taking the spacing marks of the upper arm

Taking the spacing marks of the upper arm

1. Just as for the implementation of a thermal insulation from the inside (ITI), before being able to put a membrane of waterproofing, it is necessary to make sure that the building site is out of water and out of air. The walls must be clean, dust-free and too much asperities (mortar too high at the joints) corrected. Take a measurement on the ceiling and on the floor and draw markings at a distance from the wall corresponding to the thickness of the mineral wool chosen, plus 2 cm of the thickness of the arm. Do not forget to take into account the typed windows.

Ground marking with chalk line

Ground marking with chalk line

2. From the markers, use a chalk line to mark the floor and ceiling with the laying lines of the slats in which the metal furrings of the Optima walls system will be fixed.

Sequence of the length of a complete membrane

Sequence of the length of a complete membrane

3. The implementation of the membrane can be carried out in vertical or horizontal pose.
For vertical installation cut an equivalent wall height (floor-to-ceiling), plus 2 times the thickness of the finished doubling.
Example: for a wall height of 2.80 m, a GR32 insulation in 120 mm thickness, a smooth 2 cm and a BA 13 plasterboard, you will need to cut a membrane length of ± 3.10 m ( 2,800 + 0.240 + 0.040 + 0.025).

Marouflage of the membrane

Marouflage of the membrane

4. The electrostatic properties of this membrane greatly facilitate its implementation on the masonry walls (blocks, bricks...) where it adheres directly by simply masking with a brush or a broom. If necessary, the membrane can be repositioned by sliding on the wall after marouflage.

Dimension of overlap between

Dimension of overlap between

5. The air barrier membrane is available in rolls with a length of 50 m x 1.50 m wide.
For its implementation on the wall, it must provide a 10 cm overlap between two adjacent strips, which reduces the useful width of a lé to 1, 40 m

Overflow of the membrane at the foot of the wall

Overflow of the membrane at the foot of the wall

6. A membrane overflow of at least 10 cm must also be taken into account at the junction with the joinery frames (doors and windows) and a return of the membrane at the head and foot of the wall equal to the thickness dubbing finished (as seen in 3).

Laying Adhesive for Grouting Lap Coats

Laying Adhesive for Grouting Lap Coats

7. The airtight membrane can also be put in place by horizontal laying. This mode of implementation seems faster on a blind wall than on a wall with many openings (unless you have falls to use). Attention in this case, we must take into account all the membrane returns around woodwork!
In all cases of installation, seal the overlap of the strips with the dedicated Vario KB1 or Vario Multitape adhesives.

Seal the Opt'Air membrane at the periphery

Application of the caulk bead on the wall base

Application of the caulk bead on the wall base

Head and foot of wall
1. For the junction with the ground, apply a continuous bead of Vario DS putty over the entire length of the bottom of the wall by lifting the membrane to immediately fold it on the sealant and make the bonding. Proceed in the same way to make the connection with the ceiling.

Put a bead of mastic at the level of the overlays

Put a bead of mastic at the level of the overlays

2. For a perfect airtightness, consider also sealing the membrane where two membrane strips are superimposed: at the head and foot of the wall (membrane return).

Sequence of the sealing tape around the frames

Sequence of the sealing tape around the frames

Around the door frames (joinery)
3. Around the joinery, seal the membrane with the Protape tape seal. It is an adhesive used for the connection between the membrane and a structural element (masonry, wood, PVC, aluminum). It has a wide band for maximum and continuous adhesion, even on an irregular support. It ensures the airtightness of the system.

Careful application of the sealing tape

Careful application of the sealing tape

4. Dust off the surfaces, then lay the Protape tape seal in perfect alignment with the frame. Particularly care for gluing at the level of changes of elements or material: junction trunk roller shutter to the frame, covering fixing metal brackets...

Laying the membrane on the ribbon seal

Laying the membrane on the ribbon seal

5. Press the membrane onto the frame and carefully smooth it against the tape seal to prevent creasing.

Closing the junction with the adhesive

Closing the junction with the adhesive

6. Finalize airtightness by applying Vario Multitape Adhesive to the end of the membrane with the frame. Repeat the operation for each opening, door or window, present on the wall and on its three or four sides.

Variant for sealing the Vario Duplex membrane

Laying the tape seal on the ground

Laying the tape seal on the ground

1. It is possible to seal the Vario Duplex membrane by fixing it under the top and bottom rails of the Optima system. In this case, from the line previously drawn on the floor and the ceiling, unroll the inner side (towards the wall), the tape Protape.

Placing the smooth on the membrane

Placing the smooth on the membrane

2. After applying the bead of sealant to the bottom of the wall to hold the membrane tightly against the wall, press the end of the membrane onto the tape seal, taking care to avoid creasing. Then put the smooth on the membrane and put in place.

Attachment of the compression arm of the membrane on the ribbon seal

Attachment of the compression arm of the membrane on the ribbon seal

3. Fix the healds by pistol or knocking screw. The Protape tape seal is then compressed by the mechanical fixing of the healds to the ground and thus ensures airtightness of the wall.
Attention, to guarantee the bonding of the Protape seal, the surfaces (floor and ceiling) must be perfectly dusted!

Install the insulation using the Optima Murs system

Installation steps of Optima system walls

Installation steps of Optima system walls

1. Then install the high-performance semi-rigid insulation using the Optima walls system. The transparency of the membrane and its grid (10 cm) facilitate the identification both for the positioning of the intermediate horizontal fur (1.35 m maximum of the ground) than for the overlaps or the end returns of the strips.

(photos / visuals: © Isover, except special mention)

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