What is a variable vapour control membrane?

A variable vapour control membrane is a membrane that regulates moisture movement within roof or wall constructions. It protects the insulation from excessive moisture from the interior while also supporting drying back into the room.

What does variable Sd value mean?

The Sd value describes how strongly a material slows down water vapour diffusion. With a variable vapour control membrane, this value changes depending on the surrounding humidity. When the air is drier, the membrane has a stronger vapour-retarding effect.

Can moisture dry out of the insulation again?

Yes, that is exactly one of the advantages of a variable vapour control membrane. Thanks to the humidity-variable Sd value, the membrane can support drying back into the room depending on the moisture load. This allows trapped or residual moisture to escape more easily from the construction.

Vapour barrier Vapora Vario SD

€74.50

Content: 37.5 m² (€1.99 / 1 m²)

Prices incl. VAT

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Für eine luftdichte und feuchteregulierende innere Ebene in Dach- und Wandkonstruktionen

Variable Sd value
With laying & bonding lines
Dimensionally stable

Execution

1.5m x 25m

1.5m x 50m

Total:

Roll

Product number: SW10042.1

Variable humidity regulation
With laying and bonding lines
Tearproof and dimensionally stable

Product advantages

Variable moisture regulation

Sd-value 0.4m - 6m

Stretchable and flexible

Adaptable & robust

Laying lines

Easy alignment & time saving

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HIGH FUNCTIONALITY AND SAFETY

The ALMO vapor barrier is tear-resistant, dimensionally stable and meets the strict requirements of fire class B as well as the ZVDH and EnEV standards, making it ideal for new builds, conversions and renovations. Provides the best protection against structural damage and mold.

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OPTIMUM MOISTURE REGULATION

Thanks to the variable sd value of 0.4m to 6m, our vapor barrier film adapts to seasonal conditions to effectively regulate moisture and prevent the formation of condensation.

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BREATHABLE

The high-quality vapor barrier is breathable and helps to create an airtight building envelope that improves the indoor climate and increases energy efficiency.

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UNIVERSALLY APPLICABLE & SUSTAINABLE

Our ALMO vapor retarder combines moisture-regulating properties with outstanding re-drying potential to promote sustainable, robust and healthy construction. Particularly suitable for internal and external insulation between rafters and for insulation on top of rafters with mineral insulation.

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EASY INSTALLATION

The vapor barrier foil is easy to install and supports fast and error-free installation thanks to the gluing and laying lines.

Technical Data

Application	Vapor barrier
Features	Variable Sd value, Fire classification B
Diffusion-equivalent air layer thickness (sd value)	0.4m - 6m variable
Grammage	90 g/m²
Roll dimensions	25m x 1,5m
m² per roll	37,5
Processing temperature	-5 °C to +40 °C
Fire classification	Class B
Resistance to water passage	W1 (according to DIN 1928)

Installation instructions for Vapora Vario SD vapor retarder

Step 1: Laying and fixing the vapor barrier

Lay the ALMO Vapora Vario vapor barrier on the rafters and fix it either with a stapler or by masking it with the ALMO TwinTape.

Step 2: Overlapping installation and airtight connection

Lay the second vapor barrier film with an overlap and also fix it in place either with ALMO TwinTape or by stapling. Connect the two vapor retarders with the Versa® Uni Tape 60 Adhesive tape for additional sealing. Use the overlap guide line for an overlap of 10 cm. For airtight bonding, you can use the auxiliary line at 30 mm to ensure optimum sealing with the 60 mm wide Versa® Uni Tape 60.

Step 3: Airtight bonding of the folds

To ensure an airtight seal, tape the folds of the vapor barrier in a T-shape with the Versa® Uni Tape 60 .

Step 4a: Transverse counter battens and protective cladding

Attach counter battens across the structure to support the weight of the insulation material. Then install the interior cladding to protect the vapor barrier from mechanical influences.

Step 4b: Longitudinal installation for heavy insulation materials

For wide rafter bays or heavy insulation material, we recommend laying the Vapora Vario SD in the direction of the rafters and installing the counter battens lengthways.

Step 5: Terminating and sealing penetrations

For penetrations such as pipes, make a star-shaped cut and seal the pipe with small pieces of the Versa® Uni Tape 60 off. Alternatively, a flange can be inserted and securely bonded with Versa® Uni Tape 60.

Execution:	1.5m x 25m
Characteristics:	Fire class B
Diffusion-equivalent air layer thickness (sd value):	0,4m - 3m variabel
Roll length:	25m
Width:	1,5m
m² per roll:	37,5
Processing temperature:	-5 °C to +40 °C
Fire behavior:	Class B - s2 - d0
Widerstand gegen Wasserdurchgang:	W1 (nach DIN 1928)

Downloads

Datenblatt Vapora vario SD

Data sheet Vapora vario SD

Fiche technique Vapora vario SD

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ALMO Covinga® 30/30 corner adhesive tape

Pre-folded 30/30
Fast and precise in corners
Air & windtight bonding

Product advantages

Precisely pre-folded 30/30

Simple and safe in corners

1 separating strip already removed

Quick and effortless bonding

High quality adhesive

Secure bonding

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PERFECTLY PRE-FOLDED FOR PRECISE CORNERS

The ALMO Covinga 30/30 corner adhesive tape is specially pre-folded so that it can be applied precisely in corners and edges. This creates a precise and permanently airtight bond on window and door frames and other building elements.

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EASY & FAST APPLICATION

Thanks to the already removed release strip on one side, the adhesive tape can be applied particularly quickly and easily. The second adhesive surface thus remains protected until it is needed.

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EXTREMELY STRONG ADHESION

With its high-quality dispersion acrylate adhesive, the adhesive tape adheres securely to various substrates such as wood, plasterboard, metal, plastics, vapor barriers and façade membranes - for long-term tight joints.

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PERMANENTLY AIRTIGHT & WINDPROOF BONDING

The tape provides a secure seal against draughts and moisture, contributing to the energy efficiency and durability of construction projects.

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VERSATILE APPLICATION POSSIBILITIES

Ideal for airtight and windproof bonding of vapor barriers, facade membranes and wood-based materials both indoors and outdoors.

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PROVEN QUALITY

Meets the highest requirements and is certified to DIN 4108-11 for safe, energy-efficient construction.

Technical data

Application	Interior & exterior, window & door frames, wood, wood-based panels, plasterboard, plastic, metal, vapor retarders & facade membranes
Characteristics	Tear-resistant liner, pre-folded
Carrier system	Polypropylene fleece with special coating
Adhesive	Modified dispersion acrylate
Coverage	Tear-resistant foil liner
Roll length	25m
Width	60mm, pre-folded at 30/30
Temperature resistance	-40 °C to +90 °C
Processing temperature	-5 °C to +40 °C
Suitable for airtight sealing according to	D: EnEV, DIN 4108-7 CH: SIA 180 AT: ÖNORM B 8110-2

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Content: 2 RL (€15.77 / 1 RL)

From €29.40

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ALMO TwinTape double-sided adhesive tape

Airtight installation without stapling
Double-sided strong adhesive
Tear-resistant liner

Product advantages

Gluing instead of stapling

Airtight installation without staple cracks

Tear-resistant liner

Time saving

Double-sided extreme adhesive strength

Quick & easy installation

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THE PERFECT ALTERNATIVE TO STAPLING

Thanks to its double-sided adhesive surface, ALMO TwinTape provides a strong, airtight seal that replaces conventional stapling and ensures even, clean installation without damaging the vapor barriers or connections.

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HIGH ADHESIVE STRENGTH FOR RELIABLE SEALING

Thanks to the high-performance adhesive, the double-sided adhesive tape guarantees permanent and secure fixing of vapor retarders and connections.

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EASY HANDLING THANKS TO TIGHT LINER

The tear-resistant plastic liner enables uncomplicated and precise processing of the tape, even with difficult joints.

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EXTREMELY RESISTANT TO AGEING

The high-performance adhesive does not dry out and remains stable for a long time without becoming brittle.

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TEMPERATURE-RESISTANT AND DURABLE

The double-sided adhesive tape is designed for extreme conditions - it remains fully functional even at temperatures from -40°C to +100°C and retains its adhesive strength permanently.

Technical data

Adhesive	Modified dispersion acrylate
Carrier system	Grid-reinforced LDPE foil
Coverage	Tear-resistant plastic liner
Roll length	50m
Width	20mm
Temperature resistance	-40 °C to +100 °C
Processing temperature	-5 °C to +40 °C

(7)

Content: 2 RL (€15.77 / 1 RL)

From €15.85

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Versa® Uni Tape 100 50/50 adhesive tape

Extreme adhesive strength
Tear-resistant, slit separating strip
For inside and outside

Product advantages

For inside and outside

Versatile application

Tear-resistant liner

Time saving

High adhesive strength in cold & heat

High quality

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EXTREME ADHESIVE STRENGTH AND FLEXIBILITY

Durable airtight and windproof sealing of vapor retarders, roof and façade membranes for interior and exterior use. Ideal for overlaps, connections and repairs.

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