soudal_145788

SOUDAL Soudatight LQ air- and vapour-tight membrane white (4.5 kg) - 145788

Supplier number: SOUDAL 145788 | EAN 5411183161269
Recommended Retail Price €59.64
48.95 tax incl.
€40.45 excl. VAT (incl. all environmental contributions)
On order: delivered from 13/10/2026

  • Ordered before 20:00 - delivered as of 13/10/2026
  • Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
  • Delivery by DHL
  • Delivered from Belgium

Reliable sealing with Soudal Soudatight LQ

Practical benefits
  • Seamless air and vapour barrier: You create a flexible continuous membrane across mineral surfaces to eliminate unwanted airflow and moisture transfer.
  • Fibre reinforced crack bridging: The built-in fibres allow you to bridge gaps and cracks up to 5 mm without extra mesh.
  • Easy brush application: You apply the ready-to-use paste effortlessly with a flat brush and can paint or plaster over it once cured.

In a nutshell

The right choise for

With Soudal Soudatight LQ, you create a seamless air- and vapour-tight membrane on mineral substrates. This white, ready-to-use sealing paste in a 4.5 kg tub is fibre-reinforced to bridge cracks effortlessly. Apply the liquid paste undiluted using a flat brush in at least two coats to achieve a total thickness of 1 mm to 3 mm. It provides a reliable seal for window joints, floor-to-wall connections, and penetrations, preventing unwanted draughts and heat loss. Once fully cured, you can paint or plaster directly over the flexible membrane. Tools can be cleaned easily with water before curing.



€48.95
tax incl.

Product information

Key features according to our expert

  • Weight: 4,5 kg
  • Relative density: 1
  • ADR packing group: Not applicable
  • Packaging: Bucket
  • UN number: Not applicable
  • ADR class: Not applicable
  • EUH-statements: EUH208; EUH210
  • Physical state: Liquid

Product description:

  • Soudatight LQ is a high-quality fibre-reinforced polymer paste that, once dry, forms an air- and vapour-tight elastic membrane. Use Soudatight LQ for air- and vapour-tight sealing of penetrations, window, floor-wall, wall-ceiling and roof connections. The product can be applied very easily with a flat brush. Cracks up to 2 mm can easily be bridged thanks to the fibre reinforcement. Soudatight LQ changes colour when dry (= visual check).

Properties:

  • Air- and vapour-tight
  • Fibre reinforced making it suitable for crack bridging up to 2 mm
  • Very good adhesion to many porous materials
  • Good adhesion on slightly damp substrates
  • Permanently elastic after curing and very durable
  • Can be painted over and plastered after drying
  • Meets GEV-EMICODE EC-1 PLUS: very low emission

Applications:

  • For air- and vapour-tight finishing of penetrations, seams, gaps, cracks and openings, wall/floor connections, wall/ceiling connections and window connections such as inside inner leaf (day side) and outside inner leaf (for application of facade insulation).

Instructions for use:

  • Allow Soudatight LQ to reach room temperature before use. Shake or stir well before use. Soudatight LQ is applied to the substrate directly from the packaging using a flat brush. The product should be smeared/coated onto the substrate. Apply the airtightness paste undiluted and evenly in several layers (at least 2) to the substrate to a layer thickness of minimum 1 mm and maximum 3 mm. For best coverage, apply the product at a different angle the second time. It is recommended to apply the 2nd coat only after skin formation occurs with the first coat. The application thickness should be measured (wet) using a thickness gauge. For window applications ensure that the airtightness paste forms a seamless membrane of at least 3 mm on the window frame, over the flexible foam up to ± 5 cm on the day side of the building shell. The use of masking tape (on the window frame) is recommended. However, this should be removed shortly after the application of Soudatight LQ, before curing. For wall connections, ensure that the airtightness paste forms a seamless membrane of ± 15 cm on both surfaces. Before curing, Soudatight LQ can be removed from materials and tools with water.
Supplemental hazard information
  • EUH208: Contains ... (see safety data sheet). May produce an allergic reaction.
  • EUH210: Safety data sheet available on request.

All Features

Weight
4,5 kg
Relative density
1
Adr packing group
Not applicable
Packaging
Bucket
Un number
Not applicable
Adr class
Not applicable
Euh-statements
EUH208; EUH210
Physical state
Liquid
Colour
white
Packaging form
Bucket
Product content
4.5 kg
  • Brand SOUDAL
  • EAN 5411183161269
  • Supplier number SOUDAL 145788

Frequently asked questions about this product

Answered by specialists
What is Soudal Soudatight LQ used for?
It is a fibre-reinforced paste used to create air- and vapour-tight membranes around window connections, floor-wall joints and penetrations.
How do you apply this sealing paste?
Apply the ready-to-use paste undiluted with a flat brush in at least two coats, achieving a total layer thickness of 1 mm to 3 mm.
Can Soudatight LQ bridge cracks?
Yes, the integrated fibre reinforcement allows it to bridge static cracks and joints up to 2 mm.
Can you paint or plaster over the dried membrane?
Yes, once fully cured, the seamless elastic membrane can be plastered over or painted.
How do you clean tools after use?
Before the product cures, you can easily clean tools and surfaces with water.
Questions about this product?

Our product specialists are happy to help with any questions about this range. Call, email or chat with us!

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