Installation Instructions For Using INTELLO Plus In Wood Frame Buildings With Blow In Insulation

This video covers how to properly install INTELLO Plus membrane with blow-in insulation, such as cellulose, loose fiberglass, or Havelock sheep wool insulation. In these situations, INTELLO Plus serves as interior enclosure airtightness, smart vapor retarder, a moisture management system, and netting for packing blow-in insulation behind. Here is a list of the top install tips from the video that you and your team can refer to during the installation process.

Top tips from the video:

Prep the site

  • Check framing for any protruding objects that may tear the membrane before installing
  • Only apply tape to dry, clean surfaces to ensure adhesion and airtightness

Unroll the membrane

  • Leave 1” overlap of membrane covering the floor for future sealing
  • Make sure the writing on the intello is facing into the room


  • Staple in a triangular pattern as you move along the studs to ensure the membrane is taut
  • Staple parallel to the studs
  • Staple at 3” intervals
  • Make sure the membrane is slightly relaxed at junctions (between walls & ceilings, corners, and floors) to accommodate expansion and contraction of the structure

Overlapping the membrane sheets

  • Overlap the next sheet of membrane using the guide marks on the intello
  • Using the dotted line to center the tape over the joint, tape the overlaps using TESCON VANA tape
  • The adhesive is pressure activated, so activate the tape by pressing firmly with a PRESSFIX tool

Counter-Battens a.k.a 'The Service Cavity'

  • Battens help ensure long-term airtightness of the assembly
  • Holds up the weight of insulation, especially in ceilings
  • Creates gap between finish layer and air barrier where you can run utilities or add insulation
  • Space battens a maximum of 20” apart before insulation is blown in
  • Tape joints should not support the weight of insulation. Support tape joints two ways:
    • A) Support with battens applied directly over the tape joint, or
    • B) Reinforced with perpendicular strips of tape spaced less than 12” apart also known as 'stitch taping' (see minute mark 4:30 in video)

Floor Joint

  • Seal the membrane to the floorboard using CONTEGA HF adhesive caulk

Wall Penetrations

  • Light switches and outlets: use INSTAABOX to create an airtight cavity
    • adhere instaabox boxes to the membrane with TESCON VANA tape
  • Pipes: airseal with ROFLEX gaskets
  • Cables: airseal with KAFLEX air sealing sleeves

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