March 1, 2018

Introduction to INTELLO

The keystone to long-lasting airtightness and vapor control.  

The INTELLO membrane, manufactured by Pro Clima of Schwetzingen Germany, is the state-of-the-art interior vapor control and air-tightness membrane for cold and mixed climates. It is an intelligent membrane that changes permeability in a range from <0.13 perms in winter to 13.2 perms in summer depending on the relative humidity of the air around it. This intelligent range of permeability gives assemblies maximum protection against moisture damage.

Drying Capacity > Moisture Stress = Freedom from Damage

As insulation levels and air-tightness rise to meet greater demands for energy efficiency and comfort, optimizing the drying capacity becomes ever more important.

When to use INTELLO

  1. p_intelloplus_02_150x100_cmykWhen Code requires a Class II vapor retarder:  INTELLO provides an interior Class II vapor retarder and interior airtight layer.
  2. When assemblies have significant vapor retarding or vapor closed outboard layers:  In assemblies that have limited outward drying potential, like vapor closed roofs (flat or asphalt shingles), foam insulation boards or exterior sheathing (OSB, plywood), INTELLO provides inward drying capability.
  3. When retrofitting a Historic Masonry building with interior insulation:  INTELLO helps address concerns about moisture levels of brickwork and freeze-thaw damage, while providing a verifiable and repairable airtight layer.
  4. When installing batt insulation: INTELLO provides airtightness, eliminates worries of convective currents, and manages moisture in all seasons to avoid vapor condensation problems.
  5. When interior airtightness is desired:  INTELLO provides a continuous, visibly verifiable, and repairable interior airtight membrane in addition to vapor control.

 The Science of INTELLO

Similar to natural materials like wood, INTELLO changes its vapor permeability in response to the relative humidity of the surrounding air. The membrane becomes more vapor open when exposed to higher relative humidities and more vapor closed in drier conditions. The engineered membrane achieves a range of permeability and safety not possible with other vapor-retarders, -barriers or other materials.

In winter, when the cold temperatures prevent much moisture from being held in the air, the membrane reduces its permeability to <0.13 perms. This prevents any moisture from the warmer, more humid indoor air from entering the wall assembly. In summer, the warm outdoor air carries a lot of moisture, raising the relative humidity on all sides of the membrane. The membrane increases its permeability to >13 perms to allow moisture from the warmer, more humid air inside the wall cavity to move into the interior of the building. This prevents any condensation on the inside of the walls. The increase in permeability is triggered when the air moisture content rises above dangerous thresholds of approximately 70-80%.

This chart below illustrates the average humidity ranges in winter and summer around the membrane.

Chart of Average Humidities

Chart of Average Humidities

Comparing the above chart on average humidities to the chart below showing the vapor permeability curve, we can see how INTELLO reacts as humidity reaches dangerous levels – opening up radically to allow drying inward.

INTELLO vapor curve

INTELLO vapor curve

The membrane is not directional, so as it becomes more vapor permeable due to rising relative humidity around it the vapor will move through it in the direction of lower vapor pressure. Consequently, INTELLO is not suitable as an interior membrane in consistently high-humidity occupancies like indoor swimming pools.

Taut INTELLO and smooth TESCON Vana tape assures that these materials were installed air-tightly and are ready for cellulose after battens are installed

With this ability to allow for inward drying, INTELLO can provide safety in even the most demanding circumstances. Below is a graph from an extensive Pro Clima study showing the relative drying ability of various vapor retarders.

This demonstrates the performance of different air barriers in one of the worst-case scenarios, where you have a north facing pitched roof at high altitude and a construction loaded with moisture at the outset – as construction often can be. The assembly starts with 6 kg/m2 water content after construction. Where the inboard OSB and plastic sheets are causing moisture problems, keeping the initial moisture load of the assembly constant, the intelligent vapor membrane, INTELLO, is driving down the moisture content to safe levels. For more on this, read our post: Why The Vapor Curve Matters.

INTELLO WUFI Study

INTELLO WUFI Study

The Application of INTELLO

INTELLO is the flagship material in a complete system of air sealing and vapor control that includes tapes, adhesive caulking, and gaskets – giving you robust and long lasting airtightness.

Pro Clima_INTERIOR_System_Checklist_rd2

Roof Membrane/ Wall Membrane………………………………………………………………………………… Intello Plus

Roof Membrane Tape/Wall Membrane Tape/Floor Seam Tape……………………………………… Tescon Vana

Window/Door Frame Tape……………………………………………………………………………………… Contega Solido

Wire Penetration Gaskets………………………………………………………………………………………… Kaflex Gaskets

Pipe/Duct Penetration Gaskets………………………………………………………………………………… Roflex Gaskets

Wall Membrane/Floor Connection……………………………………………………………………………….. Contega HF

INTELLO Plus, with blown cellulose behind, 2x's as counter battens support membrane, allow sheetrock to be mounted and services (electric etc). to be run on interior of airtight layer

INTELLO Plus, with blown cellulose behind, 2x’s as counter battens support membrane, allow sheetrock to be mounted and services (electric etc). to be run on interior of airtight layer.

 

If you are using dense-pack insulation, cross battens are required to ensure even distribution of pressures. Ideally, the cross-battens provide a service cavity for running wiring and plumbing and thereby limit the number of penetrations in the air- and vapor-control layer.

The Specification of INTELLO

In addition to the spec outline list below, we have a sample 3-part architectural construction specification for use and editing.

Technical Specs
Cover Polypropyleve microfiber fleece
Membrane Vapor-variable polyethylene copolymer
Reinforcement Polypropylene non-woven fabric
Color Translucent white
Attribute Norm Value
Weight DIN EN 1849-2 0.36 oz/sf (110 g/m2 +/-5g/m2)
Thickness DIN EN 1849-2 16 mils (0.4 mm +/-0.1mm)
Airtightness ASTM E2178 0.00005 cfm/ft2
Average Vapor Resistance DIN EN 1931 perm 0.44 (sd-value 7.50m +/-0.25m)
Vapor Variability ASTM E96 (dry cup/wet cup) 0.2 perm to >6 perm
Vapor Variability DIN EN 1931 perm rate from 13.20 to <0.13 (sd-value from 0.25 to >25)
Surface Burning Characteristic ASTM E84 Flamespread: 0

Smoke Development: 35

Class A fire class material

Fire Class DIN EN 13501-1 E
Tensile Strength MC/DC DIN EN 13859-1 350 N/50mm / 209 N/50mm; 40 lb/in 33 lb/in
Elongation at Break MC/DC DIN EN 13859-1 15%/ 15%
Nail Tear Resistance  MC/DC DIN EN 13859-1  240 N/ 200 N; 54 lbf / 45 lbf
Durability/Artificial age test DIN EN 1296/1297 passed
Temperature Resistance -40 F to 176 F/ -40 C to 80 C
Thermal Conductivity 0.85 hr.ft2 F/ BTU.in (0.17 W/mK)
Code Compliance
IRC 2015- R702.7 Class II Vapor Retarder
IBC 2015- 1405.3.1 Class II Vapor Retarder
NBC 2010- 9.25.4.2 Vapor Barrier Materials Passed CAN/CGBS 51.33
CE Label Available

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4 Responses to Introduction to INTELLO

  1. Kurt Waldenberg November 8, 2015 at 5:16 pm #

    We are considering using Pro Clima Intello Plus as the interior air control layer for a single-family residence, located in our area (Bellingham WA, USA).

    What is the approximate freight schedule and costs for our area for this product ?

    Thanks in advance,

    Kurt Waldenberg

    • John November 9, 2015 at 11:40 am #

      Hello Kurt,
      We make our pricing as transparent as possible – bulk prices are built in to the site, and shipping cost is calculated when you enter a shipping address in the cart. So you can use the shopping cart on our site as an estimator for orders. We have a fulfillment center in Clackamas, OR, which means our Ground Shipping option is affordable and ships in 1 business day to Bellingham.

      Standard sizes of INTELLO Plus are 800 sq ft, and installers use 2.5 rolls of TESCON VANA tape per roll of 800 sq ft membrane on average.
      Let us know if there’s anything else we can answer for you. We’re happy to help.

  2. Charlie Spinella December 5, 2015 at 10:11 am #

    Where can I purchase your Intello Plus air barrier and Tescon Vana tape? Zip code 12052. Thank you.

    • Ken December 5, 2015 at 10:20 am #

      You purchase it directly on our website. It will ship out Monday by UPS ground and should arrive the next day, on Tuesday to your shipping address.

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