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How to Seal a Structure

Updated: Mar 16, 2023




While we have shown as many details as possible, it is almost impossible to describe every construction detail. As you will see, sometimes sealing an unusual or difficult detail is achieved by the creative use of products in our system, as when we used an Isowindow product to seal a deep corrugated roof deck.


Cold Roof Space

Membrane at Ceiling Level: Attic as storage


Airstop Timbertex: The membrane is installed as an airtight vapour diffusion layer on the warm side of the building. The vcl is attached to the underside of the rafters and inside of the external stud work with a stapler or Isocell KB double-sided tape. Leave sufficient excess at perimeters so that the membrane can be sealed back to the perimeter substrate without tension.

Elasto for overlaps: Tape should be affixed centrally along the seam, and pressure applied by hand or with a firm rubber roller.

Airstop Flex For perimeters: Cut membrane to the desired length at the perimeter. Apply the Airstop Flex tape 35mm to the membrane and 40mm to the perimeter. Allowing a stress relief loop (a small excess of the membrane which allows for movement and ensures a trowel or slab won’t damage it), press or roll the tape firmly to the substrate by hand or using a firm rubber roller.

Uni Primer for dusty substrates: Set the nozzle on the can to spray the desired width of primer. Hold the can approximately 15-20 cm from the surface and spray a light primer coating. Allow the primer to dry before applying any tape. Typically, Uni Spray Primer will dry in under 10

Airstop Elasto for wire penetrations: Seal between the wire and the membrane on both sides of the wire using Airstop Elasto to create a sandwich. Where multiple wires pass through the same penetration, it may be necessary to cork between the wires using Airstop Joint paste adhesive, which is non-corrosive to wires.

Airstop Elasto for Pipe penetrations: push membrane against the pipe and cut out a circle on the inside perimeter of the pipe. Push the membrane back around the pipe and seal the membrane to the pipe using short pieces of Airstop Elasto tape in layers.

  • Real Life Installation Details

    • Airstop Timbertex is stapled to underside of ceiling joists.

    • It is overlapped 100mm and sealed along the joint using Airstop Elasto adhesive tape.


Add paragraph text here.

Airstop Timbertex is sealed to a primed perimeter block using Airstop Flex 75mm tape. Corners are tight to prevent damage by slabs





  • A service cavity prevents the need for penetrations of the airtight layer.




  • Wire penetration of the Airstop Timbertex membrane is sealed airtight using Airstop Elasto 60mm tape.




  • Pipe penetration of the Airstop Timbertex membrane is sealed airtight using Airstop Elasto 60mm tape.



Finishing


  • Roof slabs are installed and skimmed.

  • External walls are skimmed. Skim coat is applied over the Airstop Flex 75mm tape, creating continuity with the membrane in the ceiling.






Install vapour control layer for pitched roof construction, and diffusible flat roof construction

Use CE Certified Airstop Timbertex membrane: diffusible, fixed Sd value 10m, approx. weight: 100gm/m2, EN

1849-2


  • Install Airstop Timbertex vapour control layer mechanically to the underside of the rafters.

  • 100mm overlaps are sealed, permanently airtight, with Airstop Elasto 60mm. Single-sided, high-performance, stretchable and reinforced adhesive tape (meets (BS) EN-1206, (BS) EN1207).

  • Perimeter substrates are primed using Isocell Uni Spray Primer, a self-adhesive, solvent-based, synthetic rubber primer.

  • Perimeters are sealed, permanently airtight Airstop Flex 75mm, single-sided, high-performance split-liner (35mm/40mm) tape (meets (BS) EN-1206, (BS) EN1207), 35mm to vapour control layer, 40mm to the substrate.

  • Wire and pipe penetrations are sealed, permanently airtight, using Airstop Elasto 60mm. single-sided, high-performance, stretchable and reinforced adhesive tape (meets (BS) EN-1206, (BS) EN1207)

All products manufactured by: ISOCELL GMBH, BAHNHOFSTRASSE 36 - A-5202 NEUMARKT AM

WALLERSEE. Activities should be carried out following the manufacturer’s guidelines. See www.isocell.ie



  • Vaulted roof

  • Membrane to Underside of Rafters



  • Airstop Timbertex: The membrane is installed as an airtight vapour diffusion layer on the warm side of the building. The vcl is attached to the underside of rafters and inside of external stud work with a stapler or Isocell KB double-sided tape. Leave sufficient excess at perimeters so that the membrane can be sealed back to the perimeter substrate without tension.

  • Elasto for overlaps: Tape should be affixed centrally along the seam, and pressure applied by hand or with a firm rubber roller.

  • Airstop Flex For perimeters: Cut membrane to the desired length at the perimeter. Apply the Airstop Flex tape 35mm to the membrane and 40mm to the perimeter. Allowing a stress relief loop (a small excess of membrane which allows for movement and ensures it won’t be damaged by a trowel or slab), press or roll the tape firmly to the substrate by hand or using a firm rubber roller.

  • Uni Primer for dusty substrates: Set the nozzle on the can to spray the desired width of the primer. Hold the can approximately 15-20 cm from the surface and spray a light primer coating. Allow the primer to dry before applying any tape. Typically, Uni Spray Primer will dry in under 10 minutes.

  • Airstop Elasto for wire penetrations: Seal between the wire and the membrane on both sides of the wire using Airstop Elasto to create a sandwich. Where there are multiple wires passing through the same penetration, it may be necessary to cork between the wires using Airstop Joint paste adhesive, which is non-corrosive to wires.

  • Airstop Elasto for Pipe penetrations: push membrane against the pipe and cut out a circle on the inside perimeter of the pipe. Push the membrane back around the pipe and seal the membrane to the pipe using short pieces of Airstop Elasto tape in layers.


Real-Life Installation Details


  • Airstop Timbertex is stapled to the underside of the rafters.

  • It is overlapped 100mm and sealed along the joint using Airstop Adhesive Tape 60mm





  • Airstop Timbertex is sealed to the perimeter block using Airstop Flex adhesive tape.

  • Sand and cement over the Airstop Flex create continuity between airtight elements.





  • Where the vaulted ceiling meets the rising wall, the supporting steel I-beams are sealed to block using Airstop Elasto 60mm tape.

  • The gap between supporting steel I-beams was sealed using Airstop membrane taped to steel using Airstop Elasto 60mm tape.




  • Where the vaulted ceiling meets a window, the Airstop Timbertex airtight membrane is sealed to the Isowindow F12 airtight window tape using Airstop Flex 75mm tape.




Install vapour control layer for pitched roof construction, and diffusible flat roof construction.

Use CE Certified Airstop Timbertex membrane: diffusible, fixed Sd value 10m, approx. weight: 100gm/m2, EN 1849-2


  • Install Airstop Timbertex vapour control layer mechanically to the underside of rafters.

  • 100mm overlaps are sealed, permanently airtight, with Airstop Elasto 60mm. Single-sided, high-performance, stretchable and reinforced adhesive tape (meets (BS) EN-1206, (BS) EN1207).

  • Perimeter substrates are primed using Isocell Uni Spray primer, a self-adhesive, solvent-based, synthetic rubber primer.

  • Perimeters are sealed, permanently airtight Airstop Flex 75mm, single-sided, high-performance split-liner (35mm/40mm) tape (meets (BS) EN-1206, (BS) EN1207), 35mm to vapour control layer, 40mm to the substrate.

  • Wire and pipe penetrations are sealed, permanently airtight, using Airstop Elasto 60mm. single-sided, high performance, stretchable and reinforced adhesive tape (meets (BS) EN-1206, (BS) EN1207)

All products manufactured by: ISOCELL GMBH, BAHNHOFSTRASSE 36 - A-5202 NEUMARKT AM

WALLERSEE. Activities should be carried out in accordance with the manufacturer’s guidelines. See www.isocell.ie



  • Warm Roof Space

  • Membrane to Underside of Rafters: Roof as Living Space



  • Airstop Timbertex: The membrane is installed as airtight vapour diffusion layer on the warm side of the building. The vcl is attached to the underside of rafters and inside of external stud work with a stapler or Isocell KB double-sided tape. Leave sufficient excess at perimeters so the membrane can be sealed back to the perimeter substrate without tension.

  • Elasto for overlaps: Tape should be affixed centrally along the seam and pressure applied by hand, or with a firm rubber roller.

  • Airstop Flex For perimeters: Cut membrane to the desired length at the perimeter. Apply the Airstop Flex tape 35mm to the membrane and 40mm to the perimeter. Allowing a stress relief loop (a small excess of the membrane which allows for movement and ensures it won’t be damaged by a trowel or slab), press or roll the tape firmly to the substrate by hand or using a firm rubber roller.

  • Uni Primer for dusty substrates: Set the nozzle on the can to spray the desired width of the primer. Hold the can approximately 15-20 cm from the surface and spray a light coating of primer. Allow the primer to dry before applying any tape. Typically, Uni Spray Primer will dry in under 10 minutes.

  • Airstop Elasto for wire penetrations: Seal between the wire and the membrane on both sides of the wire using Airstop Elasto to create a sandwich. Where there are multiple wires passing through the same penetration, it may be necessary to cork between the wires using Airstop Joint paste adhesive, which is non-corrosive to wires.

  • Airstop Elasto for Pipe penetrations: push the membrane against the pipe and cut out a circle on the inside perimeter of the pipe. Push the membrane back around the pipe and seal the membrane to the pipe using short pieces of Airstop Elasto tape in layers.


Real-Life Installation Details.


  • Airstop Timbertex is stapled to the underside of ceiling rafters.

  • Timbertex continues down the dwarf wall.

  • Timbertex is overlapped 100mm and sealed along the joint using Airstop Elasto 60mm tape.




  • The OSB intermediate floor is primed using Uni spray primer.

  • Timbertex is sealed to the OSB floor using Airstop Flex 100mm tape.

  • Joints in the OSB are sealed using Airstop Flex 50mm tape.




  • From below, the area beneath the crawl space is sealed using Airstop Timbertex Membrane.

  • The membrane is sealed to the wall using Airstop Flex 75mm tape.

  • Airstop Timbertex is taped to the underside of the noggins using Airstop Elasto.




  • Airstop Timbertex is taped to the noggins using Airstop Adhesive Tape

  • Penetrations of the noggins are sealed with Airstop Jointpaste

  • Joints between Joists and Noggins are sealed with Airstop Jointpaste.




  • The socket box is sealed airtight to the membrane using Airstop Elasto 60mm.

  • Back of the socket box is also taped with Airstop Elasto.