Airtight Membrane 704

VALUES

• Crack-bridging ability
• Sd value 1.74 m (2 mm layer)
• Air- and waterproof
• Vapour permeable
• Nearly no shrinkage
• High elasticity
• Non-corrosive to metals
• Excellent adhesion on many materials
• Can be painted
• Can be applied on humid surfaces
• Easy to apply and seamless finish
• For exterior use

USAGE INSTRUCTIONS

Sealing window and door joints:
Place the package into the foil pack gun. Snip the top off the foil package, just below the metal clip. Screw on the nozzle with the cap.
Cut an opening to the nozzle at a 45° angle which is slightly larger than the joint to be sealed. Apply the product by keeping even pressure at the gun trigger and smoothly dragging the nozzle along the joint.
Remove the excess product and smoothen the surface with a putty knife or a flat brush.
Make sure that the membrane layer is at least 1 mm thick.

Sealing various penetrations:
A sealing cuff or reinforcement fabric must be used when sealing penetrations.
Use a putty knife or a flat brush to apply the mastic on the surface, install a sealing cuff or a reinforcement fabric and cover it again with the mastic.

Tips

• Surfaces to be sealed must be clean, dry and free from any dust, loose particles and oil stains. Non-porous surfaces should be cleaned with solvent and a clean, non-fluffy cotton cloth. Solvent excess should be removed with a clean cloth.
• To ensure an air- and weatherproof seal, at least 10-mm-thick layer of membrane needs to be applied on window and door frames, over the cured foam and on the wall structures (both for foil pack gun and pneumatic spray gun).
• If needed, the product can be applied in 2 layers. Depending on the initial layer's thickness, air humidity and temperature, the next layer can be applied approx. after 12 to 24 hours.
• To avoid splashing, protect window and door frames with masking tape. Remove masking tape right after application.
• Application temperature between +5°C and +40°C.
• Uncured product can be removed with PENOSIL Cleaning Wipes 941 or solvent. Cured product can be removed mechanically.
• Once cured, it is recommended to cover the mastic with a finishing material such as paint.
• Due to the wide variety of construction materials, we recommend a preliminary compatibility test. If necessary, prime surfaces to improve adhesion.

More expert tips in FAQ

Limitations

• Does not adhere to polyethylene (PE), polypropylene (PP) or PTFE (Teflon®).
• Not suitable for expansion joints.
• In contact with bituminous surfaces, the mastics may discolour.
• Do not use at temperatures below +5°C.
• Exterior plaster might damage the membrane's structure, it is not recommended to directly plaster over the membrane.