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Tescon No.1 being used to seal overlaps on Solitex roof membrane
Tescon No.1 sealing an Intello airtight membrane over a wood-based board
Tescon No.1 being used on a Pro Clima Roflex grommet around a pipe penetration
Sealing around Pro Clima Kaflex cable grommets with Tescon No.1
Tescon No 1 sealing the overlaps on Intello Plus membrane
Tescon No 1 sealing the overlaps on DA membrane
Tescon No 1 applied sealing overlap and behind a timber batten

Pro Clima Tescon No.1

60mm x 30m Roll

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  • Product Overview
  • Technical Details
  • Installation guide

Main purpose

To airtight seal membrane overlaps, edges, penetrations and connections to airtight accessories.

Use it on

Internal or external membranes, airtight accessories, timber, concrete, on walls, roofs, floors and ceilings.


Pro Clima Tescon No.1 is a flexible airtight tape for creating long-lasting airtight seals on airtight membranes and windtight breather membranes. It has been tested and proven to provide an airtight seal that lasts 100 years. Tescon No.1 is perfect for sealing overlaps, edges and penetrations as well as connections to most surfaces commonly found on a building site (primer may be required). It can be left exposed to UV and weather for up to 3 months prior to installing the final external finish on the building.

Where to use it 

Tescon No.1 airtight tape will permanently stick to all Pro Clima interior and exterior membranes as well as any other membrane made from PE, PA, PP, PET and aluminium. Also permanently bonds to planed or painted timber, OSB, plywood, MDF, hard plastics and metal.  

When used on wood fibre insulation boards (e.g. Gutex), concrete, plaster or smooth masonry, Tescon Primer RP or Tescon Sprimer should be used first to ensure good adhesion.  If the surface is painted or  may come away, detach or delaminate, we recommend doing an adhesion test first.

What it does

Tescon No.1 is a flexible airtight adhesive tape for airtight sealing membranes and airtight accessories on roofs, walls and floors.

The backing is very flexible and stretchy so it can be applied on curved surfaces or in curved lines without wrinkles.  The flexibility is also great for sealing to OSB as the tape can be pressed more easily into the recesses of the non-flat surface texture.  Sealing around pipes and cables is also easier with a flexible tape.

Tescon No.1 is 60mm wide; the perfect width for sealing overlaps with the recommended 25-30mm of tape on each surface.

How it works 

Tescon No.1 uses solid acrylic glue.  This type of glue is fully waterproof and unaffected by changes in temperature and humidity. It has high adhesion and excellent cohesion which means the glue stays together, won’t slip and can provide the longest lasting seal possible. Dispersion glue (used on competitor tapes) reacts to moisture causing the bond to break down relatively quickly (within a few months). Tescon No. 1’s solid acrylic glue actually gets stronger over time and is ideal for building projects in Ireland and UK due to it being unaffected by the wet climate and extreme weather conditions.

Why we love it 

Tescon No.1 has been independently tested, by Kassel University, using accelerated ageing to prove the solid acrylic glue will last 100 years. Only Pro Clima have achieved this level of durability for airtight tapes. 

After 24 hours, you will not be able to remove the tape.

System warranty

Pro Clima provide a limited system warranty, backed-up with public liability insurance, for all airtightness system, roof and wall sealing system and construction products that they supply. A 10-year warranty is provided for these products when correctly installed in combination with approved thermal insulation materials and other Pro Clima system products.  When correctly installed in combination with other manufacturers’ products (not made by Pro Clima), a 6-year warranty is provided.


  • Airtight for over 100 years
  • Versatile, elastic tape
  • For use indoors & outdoors
  • A certified tape within the Intello Plus system
  • Low VOC rating


  • Certified accelerated ageing tests & solid acrylic glues give confidence that Tescon No.1 will remain stuck ensuring a durable airtight seal.
  • A stretchy tape for trickier applications such as around pipes, with more give, it’s less likely to be damaged by other on-site materials. 
  • As it’s waterproof it is suitable for use outdoors as well as in, it can be left exposed externally for 3 months.
  • BBA & NSAI system accreditation with pro clima’s Intello Plus membrane gives specification confidence.
  • Excellent values in the hazardous substance test, giving installers peace of mind.


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Technical Details

Key Technical Data

Technical Datasheet

Material Safety Datasheet (MSDS)


System Brochure

Installation Guide

How to Install

Ensure all surfaces are dust, grease and silicone free.  Cut a manageable length of tape or put your forearm through the roll to hold it and unroll what you need as you go.  Remove the release paper and place the tape over the centre of the overlapping materials. Firmly press the tape onto the surfaces with a Pressfix Tool.  Using a Pressfix ensures the maximum strength of bond is achieved.

Tescon No. 1 being used to seal overlaps on Intello Plus

Hints and Tips

Be careful where you apply the tape, it will not come off.  The tape and its adhesive residue can be removed with Pro Clima Glumex Adhesive Remover.

Tescon No. 1 can be used for repairing items in and around the home.  E.g. bags, suitcases, paddling pools, etc

Sealing membrane overlaps with Pro Clima Tescon No.1 tape

Ecological Building Systems

Sealing board joints with Pro Clima Tescon No.1 tape

Ecological Building Systems
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